dev/dev_7mon.jsonl

{"id": "03945a08417551c80b32baa6eaf0bd0f", "question": "Add V ml of 1.2M FeCl<sub>2</sub> solution to 200 ml of 3M AgNO<sub>3</sub> solution to obtain 47.4 grams of precipitate. What is the value of V?", "choices": ["A. 100", "B. 150", "C. 200", "D. 250"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON HOA", "grade": "Lớp 10"}}
{"id": "7350474355c1306562e1fb98cbe00363", "question": "Add a solution containing 8.04 grams of a mixture of two salts NaX and NaY (X, Y are two elements found in nature, in two consecutive periods belonging to group VIIA, atomic number) into the AgNO<sub>3</sub> solution (excess), obtain 11.48 grams of precipitate. What is the mass percent of NaX in the initial mixture?", "choices": ["A. 47.2%", "B. 58.2%", "C. 41.8%", "D. 52.8%"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON HOA", "grade": "Lớp 10"}}
{"id": "ab3dec7a9c8c1b60a5d1e897cbfa1548", "question": "Call the lengths of single bond, double bond, and triple bond between N and N as a, b, c respectively. What is the order of increasing bond length?", "choices": ["A. a, b, c", "B. c, b, a", "C. b, a, c", "D. c, a, b"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON HOA", "grade": "Lớp 10"}}
{"id": "c6a88cdd4ebf4723841f34915f135744", "question": "Sulfuric acid reacts with basic NaOH solution to create which 2 salts?", "choices": ["A. Na<sub>2</sub>S<sub>2</sub> and NaHS", "B. Na<sub>2</sub>S<sub>2</sub> and Na<sub>2</sub>S", "C. Na<sub>2</sub>S and NaHS", "D. NaS and NaHS"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON HOA", "grade": "Lớp 10"}}
{"id": "ec97934cb83d7a51698f5478c5eba2e0", "question": "What is the region of space around the atomic nucleus where the probability of finding an electron is greatest (about 90%)?", "choices": ["A. atomic nucleus", "B. atomic shell", "C. electron shells", "D. atomic orbital"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON HOA", "grade": "Lớp 10"}}
{"id": "4bdf1d1cd50cdf621386a8cf47f54c76", "question": "To obtain a solution containing: 0.05 mol Al<sup>3+</sup>; 0.06 mol SO<sub>4</sub><sup>2- </sup>; 0.03 mol Cl<sup>-</sup>. Which salts must be dissolved in water and how many moles?", "choices": ["A. 0.02 mol Al<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> and 0.01 mol AlCl<sub>3</sub>", "B. 0.03 mol AlCl<sub>3</sub> and 0.01 mol Al<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>", "C. 0.05 mol AlCl<sub>3</sub> and 0.01 mol Al<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>", "D. 0.01 mol Al<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> and 0.02 mol AlCl<sub>3</sub>"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON HOA", "grade": "Lớp 11"}}
{"id": "6b5b0cb58a4962c595771c9514c08796", "question": "For the following alcohols:\n(1) CH<sub>3</sub>CH<sub>2</sub>OH (2) CH<sub>3</sub>CHOHCH<sub>3</sub>\n(3) CH<sub>3</sub>CH<sub>2</sub>CH(OH)CH<sub>2</sub>CH<sub>3</sub> (4) CH<sub>3</sub>CH(OH)C(CH<sub>3</sub>)<sub>3</sub>\nWhat is the series of alcohols that when dehydrated from each alcohol give only a single olefin?", "choices": ["A. 1, 2", "B. 1,2,3", "C. 1,2,4", "D. 1,2,3,4"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON HOA", "grade": "Lớp 11"}}
{"id": "9b8927251c6a7d99581da72f6e462d12", "question": "To identify two gases, 1 alkane and 1 alkene, only need to use a single reagent. What could that reagent not be?", "choices": ["A. K<sub>2</sub>Cr<sub>2</sub>O<sub>7</sub> solution", "B. KMnO<sub>4</sub> solution", "C. AgNO<sub>3</sub> solution", "D. Br<sub>2</sub>/CCl<sub>4</sub> solution"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON HOA", "grade": "Lớp 11"}}
{"id": "ab5a73d52a920f4e6f4e033bcf4a362a", "question": "Completely burning 5.8 grams of a monofunctional organic compound What is X's promotion program?", "choices": ["A. C<sub>2</sub>H<sub>4</sub>O", "B. C<sub>3</sub>H<sub>6</sub>O", "C. C<sub>4</sub>H<sub>8</sub>O", "D. C<sub>5</sub>H<sub>10</sub>O"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON HOA", "grade": "Lớp 11"}}
{"id": "fabb4b71f1bc50a59958d3d26530ca81", "question": "Complete combustion of 1 liter of gas mixture A consisting of C<sub>2</sub>H<sub>2</sub> and hydrocarbon X produces 2 liters of CO<sub>2</sub> gas and 2 liters of H<sub>2</sub>O. Gas volumes measured under the same conditions. What is X's CTPT?", "choices": ["A. CH<sub>4</sub>", "B. C<sub>2</sub>H<sub>6</sub>", "C. C<sub>3</sub>H<sub>8</sub>", "D. C<sub>2</sub>H<sub>4</sub>"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON HOA", "grade": "Lớp 11"}}
{"id": "4f7475ca4c0c2611cfd8137f3bb4d951", "question": "A solution containing 3 grams of glucose and 3.42 grams of sucrose when combined with an excess of AgNO<sub>3</sub>/NH<sub>3</sub> solution will yield how many grams of silver?", "choices": ["A. 2.16g", "B. 5.76g", "C. 4.32g", "D. 3.6g"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON HOA", "grade": "Lớp 12"}}
{"id": "4f84c95f11ba554eaaeb6c2a12ab50fc", "question": "React 6.72 grams of Fe with 125 ml of 3.2M HNO<sub>3</sub> solution to obtain X solution and NO gas (the only reduction product of N<sup>+5</sup>). Knowing the complete reactions, what is the mass of salt in solution X?", "choices": ["A. 21.60 grams", "B. 25.32 grams", "C. 29.04 grams", "D. 24.20 grams"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON HOA", "grade": "Lớp 12"}}
{"id": "866dcfe0ecdfbee82c3ab70f6a919284", "question": "Add 18.2 grams of a mixture of metals Fe, Cr, Cu to react with an excess of hot, dilute H<sub>2</sub>SO<sub>4</sub> solution in the absence of air to obtain dd Y and solid Z with 5.6 liters of H<sub>2</sub> (standard conditions). If 18.2 grams of Calculate the percentage of chromium in the mixture?", "choices": ["A. 42.86%", "B. 52%", "C. 26.37%", "D. 43%"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON HOA", "grade": "Lớp 12"}}
{"id": "f6b237429f08dc3af95dad84e3dc4236", "question": "Let V liters of CO<sub>2</sub> (standard conditions) be completely absorbed in a solution containing 0.2 mol Ba(OH)<sub>2</sub>; 0.05 mol NaOH and 0.05 mol KOH. After a complete reaction, a precipitate is obtained and the solution contains 22.15 grams of salt. What is the value of V?", "choices": ["A. 8.40", "B. 6.72", "C. 8.96", "D. 7.84"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON HOA", "grade": "Lớp 12"}}
{"id": "f6b9b1e5b6605afe2c435f525fa327e0", "question": "X, Y, Z are acyclic organic compounds with the same molecular formula C<sub>4</sub>H<sub>6</sub>O<sub>4</sub>. X, Y, Z all react with NaOH in solution in a 1:2 molar ratio\n- X reacts with NaHCO<sub>3,</sub> to obtain twice as many moles of gas as the number of moles of X reacting.\n- Y reacts with NaHCO<sub>3</sub> in a 1:1 molar ratio but does not have a mirror reaction.\n- Z has a mirror reaction and is inactive with NaHCO<sub>3</sub>.\nWhat are the structural formulas of X, Y and Z respectively?", "choices": ["A. HOOC-CH<sub>2</sub>-CH<sub>2</sub>-COOH,HOOC-COO-CH<sub>2</sub>-CH<sub>3</sub>, HCOO-CH<sub>2</sub>-COO-CH<sub>3</sub>", "B. HCOO-CH<sub>2</sub>-CH<sub>2</sub>-OOCH, HOOC-COO-CH<sub>2</sub>-CH<sub>3</sub>, HOOC-CH<sub>2</sub>-COO-CH<sub>3</sub>", "C. HOOC-CH<sub>2</sub>-CH<sub>2</sub>-COOH, HOOC-COO-CH<sub>2</sub>-CH<sub>3</sub>, HOOC-CH<sub>2</sub>-COO-CH<sub>3</sub>", "D. HOOC-CH<sub>2</sub>-CH<sub>2</sub>-COOH, CH<sub>3</sub>OOC-COO-CH<sub>3</sub>, HOOC-CH<sub>2</sub>-COO-CH<sub>3</sub>"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON HOA", "grade": "Lớp 12"}}
{"id": "155093e981a45a5581cbb0ac3e98fb0b", "question": "Molecular mass is the mass of a molecule in what unit?", "choices": ["A. Gam", "B. Kilogram", "C. Gram or kilogram", "D. Carbon Unit"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON HOA", "grade": "Lớp 8"}}
{"id": "1f7b3535d3e08ef1c0f77b4c6c4c7556", "question": "The density of gas B to oxygen is 0.5 and the density of gas A to gas B is 2.125. What is the molar mass of gas A?", "choices": ["A. 32 g/mol", "B. 34 g/mol", "C. 36 g/mol", "D. 28 g/mol"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON HOA", "grade": "Lớp 8"}}
{"id": "7f6503f07fab824190773cd3bdbdaf45", "question": "From the chemical formula of ammonia compound NH<sub>3</sub>, what do we know?", "choices": ["A. There are 2 atoms that create the substance. Substance created by two elements N and H, PTK = 17", "B. Substance created by two elements N and H, PTK = 17", "C. Substance created by 2 elements N and H, PTK = 17. There is 1 atom of 1N, 3 atoms of H in 1 molecule of the substance", "D. PTK = 17"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON HOA", "grade": "Lớp 8"}}
{"id": "b7bba2fddfafaa8fd5152d4221bd0ed5", "question": "What is the mass of the product formed?", "choices": ["A. 5.85 grams", "B. 11.7 grams", "C. 7.02 grams", "D. 8.19 grams"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON HOA", "grade": "Lớp 8"}}
{"id": "d855e63d0b92d0e9c16bd13f3c855b9f", "question": "What is the meaning of chemical formula?", "choices": ["A. What elements create substances?", "B. Molecular mass of the substance", "C. Number of atoms of each element in 1 molecule of the substance", "D. All answers"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON HOA", "grade": "Lớp 8"}}
{"id": "170d5448b4e7c9ca204ba99febbba7e1", "question": "Passing excess CO gas through iron oxide yields 58.8 grams of iron and a mixture of CO and CO<sub>2</sub> gases. Passing the entire CO, CO<sub>2</sub> gas mixture through the tank containing excess Ca(OH)<sub>2</sub>, the volume of the solution decreased by 78.4 grams. What is the formula of iron oxide?", "choices": ["A. Fe<sub>3</sub>O<sub>2</sub>", "B. FeO", "C. Fe<sub>2</sub>O<sub>3</sub>", "D. Fe<sub>3</sub>O<sub>4</sub>"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON HOA", "grade": "Lớp 9"}}
{"id": "2cff4de2f9e751b7c2bc861f451d5d1d", "question": "What is the oxide group that reacts both with water and with HCl solution?", "choices": ["A. Na<sub>2</sub>O, SO<sub>3</sub>, CO<sub>2</sub>", "B. K<sub>2</sub>O, P<sub>2</sub>O<sub>5</sub>, CaO", "C. BaO, Al<sub>2</sub>O<sub>3</sub>, Na<sub>2</sub>O", "D. CaO, BaO, K<sub>2</sub>O"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON HOA", "grade": "Lớp 9"}}
{"id": "8af3b5b41b09a042a5bc03308aa13d10", "question": "Which of the following compounds exists in nature and is used as a chemical fertilizer?", "choices": ["A. CaCO<sub>3</sub>", "B. Ca<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>", "C. Ca(OH)<sub>2</sub>", "D. CaCl<sub>2</sub>"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON HOA", "grade": "Lớp 9"}}
{"id": "cbe5b73d93d871e305b085f7f3889429", "question": "What is the structural formula of ethyl alcohol?", "choices": ["A. CH<sub>2</sub>–CH<sub>3</sub>–OH", "B. CH<sub>3</sub>–O–CH<sub>3</sub>", "C. CH<sub>2</sub>–CH<sub>2</sub>–OH<sub>2</sub>", "D. CH<sub>3</sub>–CH<sub>2</sub>–OH"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON HOA", "grade": "Lớp 9"}}
{"id": "cee7de9e3204d53d27f7b97b0b19306e", "question": "Dissolve just 20 grams of CuO and Fe<sub>2</sub>O<sub>3 </sub>mixture in 200 ml of 3.5M HCl solution. What is the mass of each oxide in the mixture?", "choices": ["A. 4 g and 16 g", "B. 10 g and 10 g", "C. 8 g and 12 g", "D. 14 g and 6 g"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON HOA", "grade": "Lớp 9"}}
{"id": "56128eecf0ea8603657f64041679342b", "question": "Two springs of the same natural length have stiffness \\({k_1} = 40N/m\\) and \\({k_2} = 60N/m\\). If two springs are connected in parallel, what is the equivalent stiffness?", "choices": ["A. 100N/m", "B. 240N/m", "C. 60N/m", "D. 30N/m"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON LI", "grade": "Lớp 10"}}
{"id": "58b63980ea0e8b798e39e5b051584490", "question": "Determine the velocity of the object when thrown?", "choices": ["A. \\(8m/s\\)", "B. \\(15m/s\\)", "C. \\(4\\sqrt 2 m/s\\)", "D. \\(4m/s\\)"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON LI", "grade": "Lớp 10"}}
{"id": "b000e3964fa788520da3c8c89bfad371", "question": "To determine the specific heat capacity of a metal, a piece of metal with \\(m = 400g\\) is placed in a calorimeter containing \\(500g\\) of water at \\({15^0}C\\) and heated to \\({100^0}C\\). The temperature when there is thermal equilibrium is \\({20^0}C\\). Calculate the specific heat of the metal. Ignore the heat that heats the calorimeter and the air. Take \\({C_{{H_2}O}} = {\\rm{ }}4190{\\rm{ }}J/kg.K\\).?", "choices": ["A. 327.34 J/kg.K", "B. 327.3 J/kg.K", "C. 327 J/kg.K", "D. 327.37 J/kg.K"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON LI", "grade": "Lớp 10"}}
{"id": "f2d9d5f1e11d4f1662783e59f9a63caa", "question": "On a horizontal plane, a ball of mass m<sub>1</sub> = 15 g moving to the right with a speed of 22.5 cm/s collides elastically head-on with a ball of mass m<sub>2</sub> = 30 g moving to the left with a speed of 18 cm/s. After the collision, ball m<sub>1</sub> changes direction and moves to the left at a speed of 31.5 cm/s. Neglecting all friction, what is the velocity of ball m<sub>2</sub> after collision?", "choices": ["A. 21 cm/s", "B. 18 cm/s", "C. 15 cm/s", "D. 9 cm/s"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON LI", "grade": "Lớp 10"}}
{"id": "f431325f8f80e12ae052e18ef46645da", "question": "A quantity of air is contained in an elastic sphere of volume 3 liters, at a temperature of 30<sup>0</sup>C and a pressure of 100 kPa. When the sphere is immersed in water with a temperature of 2<sup>0</sup>C, the pressure of the air inside is 3.10<sup>5</sup>Pa. How much does the volume of that sphere decrease?", "choices": ["A. \\(2.09l\\)", "B. \\(0.91l\\)", "C. \\(1.31l\\)", "D. \\(1.69l\\)"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON LI", "grade": "Lớp 10"}}
{"id": "4a329509e3060fadc82efb0c4fcac4fc", "question": "Is the D light on normally?", "choices": ["A. The light is on normally", "B. The light is weaker than normal", "C. The light is brighter than usual", "D. Not enough data"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON LI", "grade": "Lớp 11"}}
{"id": "4cb985840b684b1a4d870085656c7038", "question": "When the magnitude of the test charge placed at a point is doubled, what is the potential at that point?", "choices": ["A. unchanged", "B. Double", "C. Reduce by half", "D. Quadruple"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON LI", "grade": "Lớp 11"}}
{"id": "a1fb29c4e8f2ec456000f730b8ab21f2", "question": "The objective lens of a telescope is a converging lens with a large focal length; The eyepiece is a converging lens with a small focal length. A person, without eye defects, uses this telescope to observe the Moon in an uncorrected state. Then the distance between the objective and eyepiece is 90cm. The multiple of the lens is 17. Calculate the negatives of the objective and eyepiece?", "choices": ["A. \\({f_1} = 82cm;{f_2} = 8cm\\)", "B. \\({f_1} = 75cm;{f_2} = 15cm\\)", "C. \\({f_1} = 85cm;{f_2} = 5cm\\)", "D. \\({f_1} = 80cm;{f_2} = 10cm\\)"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON LI", "grade": "Lớp 11"}}
{"id": "d147a92ccaa8bbd9dab565b2627808f6", "question": "A nearsighted person has a clear field of vision from 12 cm to 44 cm. When wearing contact lenses to correct eye defects, what is the closest object that is far away from the eye?", "choices": ["A. 9.5 cm", "B. 16.5 cm", "C. 18.5 cm", "D. 20.0 cm"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON LI", "grade": "Lớp 11"}}
{"id": "ff83c33958d67289fd5e22fcccb2296b", "question": "A length of wire \\(10\\,\\,cm\\) is placed in a uniform magnetic field and is aligned with the magnetic induction vector at an angle \\({30^0}\\). The current flowing through the wire has a magnitude of \\(0.75\\,\\,A\\). The magnetic force acting on that piece of wire is \\(4,{5.10^{ - 2}}\\,\\,N\\). What is the magnitude of the magnetic induction of that magnetic field?", "choices": ["A. \\(1,0\\,\\,T\\)", "B. \\(1,2\\,\\,T\\)", "C. \\(0,4\\,\\,T\\)", "D. \\(0,6\\,\\,T\\)"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON LI", "grade": "Lớp 11"}}
{"id": "02e3111fe29f0e10f83c5fb5e9d5c763", "question": "A spring pendulum with stiffness k oscillates along the horizontal Ox axis with the equation \\(x = Aco{\\rm{s}}\\omega {\\rm{t}}\\). The potential energy point is at the equilibrium position. What is the mechanical energy of a pendulum?", "choices": ["A. \\(\\frac{1}{2}k{A^2}\\)", "B. \\(kA.\\)", "C. \\(k{A^2}.\\)", "D. \\(\\frac{1}{2}kA{\\rm{.}}\\)"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON LI", "grade": "Lớp 12"}}
{"id": "457e9b71e0d7bec7161e9735b8642f04", "question": "Consider a series circuit consisting of resistor R, capacitor with capacitance C and coil with inductance L and resistance r. Knowing \\(L = C{R^2} = C{r^2}\\) Applying an AC voltage circuit \\(u = U\\sqrt 2 \\cos \\omega t(V)\\) then the effective voltage of the RC circuit is \\(\\sqrt 3 \\) times the effective voltage at both ends of the coil. What is the power factor of the circuit?", "choices": ["A. \\(\\dfrac{{\\sqrt 3 }}{2}\\)", "B. \\(\\dfrac{{2\\sqrt 2 }}{3}\\)", "C. \\(\\dfrac{{\\sqrt 2 }}{2}\\)", "D. \\(\\dfrac{1}{2}\\)"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON LI", "grade": "Lớp 12"}}
{"id": "586a1a0e267e616ded8d34633b681589", "question": "Two harmonic oscillators in the same direction have the equations \\({x_1} = Aco{\\rm{s}}\\left( {\\omega t - \\frac{{2\\pi }}{3}} \\right)cm\\) and \\({x_2} = Aco{\\rm{s}}\\left( {\\omega t + \\frac{\\pi }{3}} \\right)cm\\). What is the phase difference between the two oscillations?", "choices": ["A. \\(\\frac{\\pi }{3}\\)", "B. 0", "C. \\(\\frac{\\pi }{2}\\)", "D. \\(\\pi \\)"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON LI", "grade": "Lớp 12"}}
{"id": "661f133e8fcdaa496512cd46cbb78972", "question": "The series RLC circuit has \\(R = 25\\,\\,\\Omega ;\\,\\,C = \\dfrac{{{{10}^{ - 4}}}}{\\pi }\\,\\,F\\) and L is a variable inductive coil. The potential difference between the two ends of the circuit is \\(u = 200\\sqrt 2 \\cos \\left( {100\\pi t - \\dfrac{\\pi }{2}} \\right)\\,\\,\\left( V \\right)\\). Change L so that the circuit power reaches maximum. What is the value of L then?", "choices": ["A. \\(L = \\dfrac{1}{{2\\pi }}\\,\\,H\\)", "B. \\(L = \\dfrac{1}{\\pi }\\,\\,H\\)", "C. \\(L = \\dfrac{2}{\\pi }\\,\\,H\\)", "D. \\(L = \\dfrac{4}{\\pi }\\,\\,H\\)"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON LI", "grade": "Lớp 12"}}
{"id": "97713eb501016e51cae6b9f2d8e3d7d8", "question": "For the nuclear reaction \\({}_{17}^{37}Cl + p \\to {}_{18}^{37}{\\rm{Ar}} + {}_0^1n\\) , the masses of the nuclei are m<sub>Ar</sub> = 36.956889u, m<sub>Cl</sub> = 36.956563 u; m<sub>n</sub> = 1.008670u , m<sub>p</sub> = 1.007276u; 1u = 931.5 MeV/c<sup>2</sup>. What energy is released or absorbed by this reaction?", "choices": ["A. Emitted 1.60218 MeV", "B. Input 1.60218 MeV", "C. Radiate 2.562112.10<sup>-19</sup> J", "D. Income 2.562112.10<sup>-19</sup> J"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON LI", "grade": "Lớp 12"}}
{"id": "7b1b1211a8ad01d9b51631198d09ccff", "question": "What form of energy is needed for ice to melt into water?", "choices": ["A. Light energy", "B. Sound energy", "C. Chemical energy", "D. Thermal energy"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON LI", "grade": "Lớp 6"}}
{"id": "93f4fe1778887cbcf98557c9d6709fa0", "question": "Conduct an experiment with two identical sheets of paper.\n+ Sheet 1: Roll into balls.\n+ Sheet 2: Lay flat\nThen, drop the two sheets of paper from the same height. Which piece of paper hits the ground first? Why?", "choices": ["A. Sheet 1 hits the ground first because it is heavier than sheet 2", "B. Sheet 2 hits the ground first because it is lighter than sheet 1", "C. Sheet 1 hits the ground first because it experiences less air resistance than sheet 2", "D. Sheet 1 hits the ground first because it experiences more air resistance than sheet 2"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON LI", "grade": "Lớp 6"}}
{"id": "942b32e494cfeb213b878452d600bfad", "question": "How many grams does a pair of books weighing 35N have?", "choices": ["A. \\(3.5g\\)", "B. \\(35g\\)", "C. \\(350g\\)", "D. \\(3500g\\)"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON LI", "grade": "Lớp 6"}}
{"id": "b71c6cf7980124d8a59474b48aeb85fe", "question": "To determine the density of the pebbles, Su, Sen, and Anh gave the following opinions:\nSu: I only need a scale and that's enough\nSen: In my opinion, you need a graduated cylinder to be correct\nAnh: That's wrong, you need a scale and a graduated cylinder to determine it\nIn your opinion, which opinion is correct?", "choices": ["A. Use it correctly", "B. Sen is correct", "C. You are right", "D. All three of you are wrong"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MON LI", "grade": "Lớp 6"}}
{"id": "f6a9febe10873c5810d088c689459be5", "question": "A fruit basket weighs 50 N; what is its mass in kilograms?", "choices": ["A. 5 kg", "B. 0.5 kg", "C. 50 kg", "D. 500 kg"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "PHYSICS", "grade": "Lớp 6"}}
{"id": "1e10e4eaac2cd1cc3c3dcf46d9f72f47", "question": "When switch K is closed, voltmeter V reads \\(U_d = 6\\,V\\), voltmeter V1 reads \\(U_{1d} = 4\\,V\\). What is the reading \\(U_{2d}\\) of voltmeter V2 at that time?", "choices": ["A. 2.5V", "B. \\(1V\\)", "C. 4V", "D. \\(2V\\)"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "PHYSICS", "grade": "Lớp 7"}}
{"id": "2762586ebc85c2cab3f721c70405d962", "question": "Choose the correct answer: The hair dryer operates because?", "choices": ["A. Thermal effect of electric current", "B. The luminous effect of electric current", "C. Both heat effect and luminescence effect", "D. Based on other effects"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "PHYSICS", "grade": "Lớp 7"}}
{"id": "49e5eedfef2d300d4d35ac58df498a66", "question": "Choose the wrong answer?", "choices": ["A. A divergent beam is a bundle of light emitted from a point source in which the rays diverge.", "B. A converging beam is a beam of light in which the rays intersect.", "C. Flashlight, the Sun emits periodic rays.", "D. Parallel rays are a bundle consisting of rays that do not intersect."], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "PHYSICS", "grade": "Lớp 7"}}
{"id": "879a3eeba2bdbd385469f978ef38261c", "question": "Why do we see an object?", "choices": ["A. Because open eyes directed toward the object.", "B. Because the eye emits a ray of light", "C. Because light is transmitted from the object into our eye.", "D. Because of the light source"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 7"}}
{"id": "8d3d419893ac40170b375c1262bf9eda", "question": "To measure a current in the range 0.10 A → 2.20 A, what type of ammeter with GHĐ and ĐCNN should we use?", "choices": ["A. \\(3A - 0.2A\\)", "B. $30mA - 0,1mA$", "C. 300mA - 2mA", "D. \\(4A - 1mA\\)"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "PHYSICS", "grade": "Lớp 7"}}
{"id": "6a0bb331c23004c6b9495cc9ed8a97fc", "question": "Two lead bars of equal volume, one bar is immersed in water, the other bar is immersed in oil. Which bar experiences a smaller buoyant force? Why?", "choices": ["A. The lead bar in oil experiences a smaller pushing force because the specific weight of oil is greater than that of water.", "B. The lead bar in oil experiences a smaller pushing force because the specific gravity of water is greater than that of oil.", "C. The lead bar in water experiences a smaller Archimedes' buoyant force because the specific weight of water is greater than that of oil.", "D. The buoyant force acts on the two bars equally because both bars occupy the same volume in the liquid."], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "PHYSICS", "grade": "Lớp 8"}}
{"id": "e7e20d6a39274d118cf636b74c59e8ac", "question": "To lift an object weighing \\(P = 650\\,\\text{N}\\) using a dynamic pulley, the rope must be pulled a distance of \\(10\\,\\text{m}\\). What are the pulling force, the height the object is raised, and the work done in lifting the object?", "choices": ["A. \\(F = 650 N; h = 10 m; A = 6500 J\\)", "B. \\(F = 650N;h = 5m;A = 3250J\\)", "C. \\(F = 325N; h = 10m; A = 3250J\\)", "D. \\(F = 325N; h = 5m; A = 3250J\\)"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "PHYSICS", "grade": "Lớp 8"}}
{"id": "efc60914ae71b50e6af3b9f2524670cd", "question": "A 2 N object slides on a horizontal table for 0.5 m. What is the work done by gravity?", "choices": ["A. 1J", "B. 0J", "C. 2J", "D. 0.5 J"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "PHYSICS", "grade": "Lớp 8"}}
{"id": "f248acc337fb72d62e9c2735a58cfd0b", "question": "In the figure, the liquid levels in the three vessels are equal. Vessel 1 contains water, vessel 2 contains alcohol, and vessel 3 contains mercury. Let \\(p_1,\\;p_2,\\;p_3\\) denote the pressures exerted by the liquids on the bottoms of vessels 1, 2, and 3, respectively. Which vessel experiences the greatest pressure at its bottom?", "choices": ["A. Bình (1)", "B. Bình (2)", "C. Bình (3)", "D. Three equal bowls"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "PHYSICS", "grade": "Lớp 8"}}
{"id": "f7c47d2edc8e72c613e237ea5b1b648d", "question": "If we want to reduce the pressure on the area being compressed, what can we do?", "choices": ["Reduce pressure on the compressed area", "B. Reduce the area of compression", "C. Increase pressure and increase the area being compressed at the same time.", "D. Increase pressure and reduce the compressed area"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "PHYSICS", "grade": "Lớp 8"}}
{"id": "1aec0abf094bc4e1894e0dd9062aeadb", "question": "How does the resistance of the conductor change if the length of the conductor is doubled?", "choices": ["A. Increase 4 times", "B. Reduce by 4 times", "C. Increase by 2 times", "D. Reduce by 2 times"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "PHYSICS", "grade": "Lớp 9"}}
{"id": "4ee86f802fdfe09074c0c4ec6d9a7331", "question": "A power plant generates a power of 100,000 kW and needs to transmit it to the consumption point. Given that the transmission efficiency is 90%, what is the power loss on the transmission line?", "choices": ["A. 10000kW", "B. 1000kW", "C. 100kW", "D. 10kW"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "PHYSICS", "grade": "Lớp 9"}}
{"id": "86be74e0c84eca572cb2912b530b5182", "question": "A 220V – 100W light bulb and a 220V – 1000W electric stove are used at rated voltage; on average, the bulb is used 5 hours per day, the stove 2 hours. The price of 1 kWh of electricity is 2,000 VND. Calculate the electricity bill for the two devices over 30 days?", "choices": ["A. 150,000 VND", "B. 300,000 VND", "C. 500,000 VND", "D. 66.0000 VND"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "PHYSICS", "grade": "Lớp 9"}}
{"id": "92bf5fbf5456e7c9eee0786e5fd54d8a", "question": "Apply a voltage U = 12 V across the two ends of a circuit consisting of resistor R₁ = 40 Ω in series with resistor R₂ = 80 Ω. What is the voltage across the two terminals of resistor R₁?", "choices": ["A. 6 V", "B. 4 V", "C. 8 V", "D. 12 V"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "PHYSICS", "grade": "Lớp 9"}}
{"id": "a114eaca6233c1c4457d9480a857e975", "question": "To photograph an object that is very far away, the lens must be adjusted so that?", "choices": ["A. The object focal point of the lens is very far from the film.", "B. The object focal point of the lens is located behind the film.", "C. The lens’s object focal point lies exactly on the film.", "D. The lens’s object focal point is located in front of the film."], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "PHYSICS", "grade": "Lớp 9"}}
{"id": "4f1120e916381e7d2c2d711f637ce92f", "question": "Given a species with 2n = 24 and meiosis lasting 12 hours, the time spent in the intermediate phase is 10 hours longer than the time spent in cell division during one cell cycle. In meiosis, the durations of the pre‑phase, middle‑phase, post‑phase, and final‑phase are in the ratio 4 : 1 : 1 : 4. Determine the number of new cells produced and the number of chromosomes in their respective states from a zygote of the species at 59 hours 30 minutes.", "choices": ["A. 31 and 1536", "B. 7 and 192", "C. 63 and 2289", "D. 15 and 384"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Student", "grade": "Lớp 10"}}
{"id": "9c4dc7b0fdd9d8d2437a749de5ddd86e", "question": "Besides the nitrogenous base, what are the other components of the ATP molecule?", "choices": ["A. 3 ribose sugar molecules and 1 phosphate group", "B. 3 deoxyribose sugar molecules and 1 phosphate group,", "C. 1 ribose sugar molecule and 3 phosphate groups", "D. 1 molecule of deoxyribose sugar and 3 phosphate groups"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "STUDENT", "grade": "Lớp 10"}}
{"id": "a87fd76861ac4ebc8401aa6f4fd2017c", "question": "What are the main forms of reproduction of primitive cells?", "choices": ["A. divide by internal spore, by external spore", "B. divide by external spore, burnt spore, sprouting", "C. binary division, budding, by asexual spores, sexual spores", "D. divide by endospores, sprout"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Student's subject", "grade": "Lớp 10"}}
{"id": "d3e1ca04854d1db09827effee8e81eaa", "question": "Cells, organs, and organ systems are the intermediate structural levels of which level of living organization?", "choices": ["A. Cell", "B. Body", "C. Population", "D. Ecosystem"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Student", "grade": "Lớp 10"}}
{"id": "e30fede067a761f436bf68bc71701b91", "question": "What is the nature of most enzymes?", "choices": ["A. Oxygen", "B. Lipid", "C. Carbohydrate", "D. Protein"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Student", "grade": "Lớp 10"}}
{"id": "31cf8a61a128cf311b9ed0a5a70aac35", "question": "In the signal transduction mechanism, the chemical messenger binds to the receptor on the inner membrane, causing the inner membrane to ...", "choices": ["A. Polar island", "B. re-polarization", "C. loss of polarization", "D. Polar reversal and repolarization"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Student's subject", "grade": "Lớp 11"}}
{"id": "749282d6f5cd90d4629429742a7073e0", "question": "Why can salt-tolerant plants such as Su, Vẹt, Đươc still obtain water in saline soil environments?", "choices": ["A. Because of the selective permeability of biological membranes and intracellular membranes.", "B. Because these species have a special part in the root, they can obtain water.", "C. Because the root cell membranes of these species have a structure suitable for the ability to absorb water in soil environments with higher solute concentration than root hair cells.", "Because root hair cells lack a cuticle, they have an osmotic pressure greater than the soil solution concentration."], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MÔN SINH", "grade": "Lớp 11"}}
{"id": "7dcd076899dd2b08453cc6f115096ab5", "question": "Show the path of blood (starting from the heart) in the systemic circulation?", "choices": ["A. Heart => body cavity => artery => vein", "B. Heart => vein => body cavity => artery", "C. Heart -> artery => vein => body cavity", "D. Heart => artery => body cavity => vein"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Student", "grade": "Lớp 11"}}
{"id": "7ff68b5103ede344a4c54541993bab48", "question": "How does food digestion occur in the rumen?", "choices": ["A. Absorb less water in food", "B. Food is mixed with saliva and is broken down by microorganisms into cells and secretes digestive cellulase enzymes.", "C. Secrete pepsin and HCl to digest protein present in microorganisms and grass.", "D. Food is brought to the mouth for chewing again."], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Student's subject", "grade": "Lớp 11"}}
{"id": "b03095c3cd0704ba04e45ebb78d7d85f", "question": "The factors affecting plant growth include?", "choices": ["A. Internal factor", "B. Light and temperature", "C. External factors", "D. Both A and C"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Life Science", "grade": "Lớp 11"}}
{"id": "3bb6dba663db3ac88affefaa1d68f66c", "question": "A gene has 3,600 nucleotides, and the difference between the number of G nucleotides and other nucleotides accounts for 10% of the gene’s total nucleotide count. Calculate the number of hydrogen bonds formed when the gene is duplicated four times.", "choices": ["A. 70200", "B. 74880", "C. 37440", "D. 140400"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MÔN SINH", "grade": "Lớp 12"}}
{"id": "67a09afa30b4f9772e5f57b9f63f70b0", "question": "What is the cross between an individual carrying a dominant trait and an individual carrying the corresponding recessive trait called?", "choices": ["A. Lai analysis", "B. Lai on a different line", "C. Lai compliance-rebellion", "D. Improve again"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "STUDENT", "grade": "Lớp 12"}}
{"id": "86ec7b8ecb99957918bc459408be9bae", "question": "From the 3 types of nucleotides U, G, X, how many triples can be formed that contain at least one nucleotide of type X?", "choices": ["A. 19", "B. 27", "C. 37", "D. 8"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Student", "grade": "Lớp 12"}}
{"id": "9a57fa8c389aa6e5be833a74233205df", "question": "In a plant species, the gene that determines flower color has two alleles, A and a, and the gene that determines fruit shape has two alleles, B and b. It is known that the two gene pairs are located on the same pair of autosomes and are completely linked. Given a plant that is heterozygous for both gene pairs and self‑pollinates, what is the minimum number of phenotypic classes in the offspring?", "choices": ["A. 4", "B. 1", "C. 2", "D. 3"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Student's subject", "grade": "Lớp 12"}}
{"id": "feb64719bfa8c8b15e6ebda7669d14b5", "question": "Two populations live in the same geographic area, but individuals of these two populations do not interbreed because they have different mating calls during the breeding season. What type of isolation is this?", "choices": ["A. Method of iteration", "B. Method of separation after the union of the soul", "C. Mechanical separation method", "D. Time segmentation method"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Student's subject", "grade": "Lớp 12"}}
{"id": "1a839ce71a465cacc98ae3ed290eb393", "question": "What is the role of animals in nature?  \n1) They are an important link in the natural food chain.  \n2) They contribute to maintaining the balance of species numbers in the ecosystem.  \n3) They provide raw materials for life (skin, fur, …).  \n4) Many species can restore soil, such as earthworms, crickets, termites, …  \n5) They make crafts and jewelry.?", "choices": ["A. 1,2,3,4", "B. 1,2,4", "C. 2,4,5,6", "D. 1,3,5,6"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Student's subject", "grade": "Lớp 6"}}
{"id": "5365c627184fd63f5da1156249787c8f", "question": "What adaptive significance does the phenomenon of seeds being enclosed in a fruit have?", "choices": ["A. Helps seeds get better protection, increasing the chance of preserving the lineage.", "B. Helps store nutrients to nourish the seed when it germinates.", "C. Help the stored nutrients in the seed not be lost outside.", "D. All the options presented"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Life subject", "grade": "Lớp 6"}}
{"id": "730b4b36348246f1cb35f9c06f2db095", "question": "Approximately how many species of vascular plants are there in our country?", "choices": ["A. About 12,000 species", "B. Approximately 10,000 species", "C. Approximately 15,000 species", "D. Over 20,000 species"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MÔN SINH", "grade": "Lớp 6"}}
{"id": "784e31a5e24e8529862bfe631cf4e781", "question": "What is the scientific name of modern humans?", "choices": ["A. Homo sapiens", "B. Denisovans", "C. Neanderthals", "D. Homo erectus"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Student", "grade": "Lớp 6"}}
{"id": "cfe53f6917fe5d233d7bb2740237d3cc", "question": "During fertilization in plants, the male gamete will combine with the female gamete present in the ovule to form a new cell called what?", "choices": ["A. blank", "B. hợp tử", "C. noãn", "D. seed"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Student", "grade": "Lớp 6"}}
{"id": "54980f0fc498e07ee9a1e5b7d5a34743", "question": "When the blue roach reproduces, what is the part that divides first?", "choices": ["A. Cell nucleus", "B. not compressing", "C. eye point", "D. again"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Student's subject", "grade": "Lớp 7"}}
{"id": "975d89b4ae03a405998268ebc4759a0d", "question": "How does it breathe?", "choices": ["A. Skin", "B. Carry", "C. Lung", "D. Oral"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Student", "grade": "Lớp 7"}}
{"id": "b34ab727264987bdf968ed8b08a67541", "question": "What characteristics are present in bony fish but not in cartilaginous fish?", "choices": ["A. Carry", "B. There are two closed loops.", "C. Bubble", "D. Find 2 compartments"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Student's subject", "grade": "Lớp 7"}}
{"id": "bc8dd73d4372663a2f79431bb8a6f386", "question": "What is the role of the common frog in nature?", "choices": ["A. Make food", "B. Help balance the ecosystem", "C. Use animals as experimental subjects in physiology", "D. Manufacture pharmaceuticals"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MÔN SINH", "grade": "Lớp 7"}}
{"id": "e1ddf40269ee3b46aa57a497ad22a669", "question": "In what environment do carp live?", "choices": ["A. Swamp water environment", "B. Freshwater environment", "C. Saline water environment", "D. Saline and brackish water environment"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Student", "grade": "Lớp 7"}}
{"id": "0b8dc5a519fdcd8a2dcdef53df31aca1", "question": "Through which organ does the fetus carry out metabolic exchange with the mother's body?", "choices": ["A. Ovary", "B. Intestine", "C. Pregnancy", "D. Fallopian tube"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "STUDENT", "grade": "Lớp 8"}}
{"id": "4dec308b2128c8fd35afaca7a702e77e", "question": "The internal environment of the body is formed by?", "choices": ["A. Water model", "B. Blood", "C. White blood cells", "D. All three factors above"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Student's subject", "grade": "Lớp 8"}}
{"id": "aea049c257244213c87259c32711cd11", "question": "For a woman with a regular 28‑day cycle, assuming the first day of menstruation this month is the 2nd, at what time during the month will she ovulate?", "choices": ["A. The 3rd day", "B. Day 30", "C. Day 16", "D. Day 10"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "STUDENT", "grade": "Lớp 8"}}
{"id": "d7a59d18b46647194dbf76a7cbe955fc", "question": "Which chamber of the heart receives blood from the left atrium and pumps it into the aorta?", "choices": ["A. Right atrium", "B. Right ventricle", "C. Left atrium", "D. Broken heart"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Student's subject", "grade": "Lớp 8"}}
{"id": "f99800754b9daa8b65b5f2ab861f4e01", "question": "To correct myopia, we need to wear?", "choices": ["A. sunglasses", "B. magnifying glass", "C. converging lens", "D. kính phân kì"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Student's subject", "grade": "Lớp 8"}}
{"id": "61162e20b131b008d23f16bc79f24c32", "question": "To create high‑yield crop varieties, people use the method of inducing mutations in selection?", "choices": ["A. multiple", "B. loss of chromosome segment", "C. multiple", "D. Transfer of chromosome segment"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Student", "grade": "Lớp 9"}}
{"id": "805fa68386dc481d920ee22dd06c0b8c", "question": "If you continue to cross and analyze the F1 generation (Aa – tall), what phenotype will be obtained in the next generation?", "choices": ["A. 1 long: 2 short", "B. 1 long: 1 short", "C. 3 long : 1 short", "D. 1 long : 3 short"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Student's subject", "grade": "Lớp 9"}}
{"id": "d93ac60b1f386a64720d66ebf2be5c87", "question": "What is the most important event in the process of fertilization?", "choices": ["A. Combination by principle: one male gamete and one female gamete", "B. The chromosomal combination of two haploid gametes", "C. The combination of the chromosome set of the male gamete and the female gamete", "D. Formation of a compound nucleus"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Student", "grade": "Lớp 9"}}
{"id": "e507eb95591a1cbbcbf06d532330887c", "question": "What is a genetic disease?", "choices": ["A. Diseases of the genetic system, comprising diseases and defects that arise solely from errors in the gene set or from errors in the gene’s activity.", "B. Diseases of the genetic system, comprising diseases and disorders that arise from errors in chromosome structure or number, gene sets, or errors in the process of gene activity.", "C. diseases of the genetic system, including diseases and disorders that arise from errors in chromosome structure or number, or errors in gene activity.", "D. diseases of the genetic system, including diseases and disorders that arise from errors in chromosome structure or number and genes."], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "MÔN SINH", "grade": "Lớp 9"}}
{"id": "f8d319b5683d264e2be455729bbbd253", "question": "What is a gene?", "choices": ["A. Genetic factor", "B. A segment of the DNA molecule", "C. Là NST", "D. A segment of an RNA molecule"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "STUDENT", "grade": "Lớp 9"}}
{"id": "74d9428166188a9148df9337a3db2a6b", "question": "According to Empress Dowager Linh Nhân, King Lý Nhân Tông issued a decree: “Anyone who steals or cuts off a buffalo will be punished with 80 trượng, those who make a khao giáp, … If neighboring households do not report, they will be punished with 80 trượng.” (The Complete Annals of Đại Việt). What does this excerpt illustrate in the agricultural development policy of the Lý dynasty?", "choices": ["A. Concern for protecting pulling power for agriculture", "B. Motivate the people to increase production", "C. Provide additional buffaloes for some poor families", "D. Provide fertilizer for healthy crops"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 10"}}
{"id": "762bec345dd395e56b6521e35233b462", "question": "What prominent characteristics does early Đại Việt literature have?", "choices": ["A. carries the heavy Confucian ideology", "B. heavily laden with Buddhist thought", "C. is strongly influenced by the West.", "D. the process of modernizing literature takes place."], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 10"}}
{"id": "81917275f8afdeb4bb04b8caaf9e3131", "question": "When was the first human social kinship relationship formed?", "choices": ["A. Formation alongside the emergence of the ancient monkey species", "B. Formation in the era of the Ancient Dark People", "C. The simultaneous formation of the wise person", "D. Formed in the New Stone Age"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 10"}}
{"id": "a011b2a60c162e5b4313a0bb40c326fe", "question": "Who was the pioneer of the materialist school?", "choices": ["A. Ph-ran-xít Bây-cơn", "B. Cô-péc-ních", "C. Acidimet", "D. Ô-ten-tô"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 10"}}
{"id": "fc8c69fb1f4edca825c67a537c1df375", "question": "What is a young teenager with a deep hatred of the enemy, who crushed an orange in his hand when he was not allowed to attend the meeting to discuss strategies to fight the enemy?", "choices": ["A. Tran Quang Khai", "B. Tran Quoc Tuan", "C. Tran Quoc Toan", "D. Tran Binh Trong"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 10"}}
{"id": "0c350c5198029587935f326fcb4bccfe", "question": "What is the greatest advantage of the anti‑French patriotic movement at the end of the 19th century?", "choices": ["A. a large group of classes and strata in society", "B. carry out an armed uprising", "C. slow down the exploitation process of the French colonialists.", "D. Identify the target of the struggle as the French colonialists."], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 11"}}
{"id": "18d3db254926f41a8882fe6b456a4ba0", "question": "What pretext did the French colonists use to invade Bắc Kì for the second time (1882)?", "choices": ["A. The Nguyen dynasty continued the policy of opening ports.", "B. The Nguyen dynasty brutally suppressed the peasant uprisings.", "C. The Nguyen continued to have cordial relations with the Qing in China without going through France.", "D. The Nguyen dynasty violated the Giáp Tuất Treaty (1874)"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 11"}}
{"id": "1ff014ab797613b2893a53f0d16c6fe3", "question": "What lessons or experiences did the struggle movements in Africa at the end of the 19th century and the beginning of the 20th century leave for countries around the world?", "choices": ["A. There must be a leadership organization with a correct, innovative approach.", "B. Must unite the national liberation forces.", "C. Must have a leadership organization with a correct, innovative line, and must unite the national liberation forces.", "D. Must seize the support of countries outside the region."], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 11"}}
{"id": "6391d86bc5140d7844a364c41877eb3e", "question": "When was the Neutrality Act proposed by the US?", "choices": ["A. August 1935", "B. September 1935", "C. October 1935", "D. November-1935"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History subject", "grade": "Lớp 11"}}
{"id": "f8e2df6f61f9b9f7af6f1d10873da66d", "question": "Which event forced the United States to abandon its neutrality policy and join World War II?", "choices": ["A. Japan attacked the US Pacific Fleet at Pearl Harbor on December 7, 1941.", "B. The United States and Britain declared war on Japan on 8 December 1941.", "C. The United States declared war on Germany and Italy on 11/12/1941.", "D. Germany and Italy declared war on the U.S. on 11 December 1941."], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 11"}}
{"id": "0a975912405312baa6f105b7a0212176", "question": "What is the significance of our country becoming the 149th member of the United Nations?", "choices": ["A. It was a great victory on the diplomatic front for our Party and State in 1976.", "B. It is a major event affirming Vietnam's position on the international stage.", "C. As an important milestone in the process of international integration, the US embargo policy against Vietnam initially failed.", "D. Vietnam has the conditions to expand cultural and goods exchanges in the market."], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 12"}}
{"id": "0d45a7b86e4bcaea52304d6b01f27ea0", "question": "Which countries participated in the Ianta Conference (1945)?", "choices": ["A. English - French - U.S.", "B. England - USA - Soviet Union", "C. English - French - German", "D. United States - Soviet Union - China"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 12"}}
{"id": "4ce88aa92b47fe40e9e68cfe863e76f6", "question": "What is the most important significance of the Viet Bac victory in autumn‑winter (1947)?", "choices": ["A. Demonstrate the maturity of the army", "B. Completely bankrupt the quick‑attack, quick‑victory plan; force the enemy to passively shift to a long‑term fight.", "C. Securely protect the Việt Bắc base and the nerve center.", "D. Demonstrate that our military and civilian forces can push back large‑scale enemy offensives."], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 12"}}
{"id": "6c3fa9e2176469919cd90a631ef1e2c8", "question": "Why did Ních Xơn’s visit to China (February 1972) have a negative impact on Vietnam’s anti‑American war?", "choices": ["A. Because the Soviet Union has compromised with the U.S., China will certainly compromise.", "B. Because this is a diplomatic maneuver to limit China's assistance to Vietnam.", "C. Because the U.S. promised to facilitate China’s occupation of the Spratly Islands.", "D. Because the Chinese themselves also do not want Vietnam to unify."], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 12"}}
{"id": "89c9c0a2781b1d0b48608c37b4f93fe9", "question": "What are the prominent characteristics of the U.S. economy from 1973 to 2000?", "choices": ["A. Development intermingled with crisis", "B. Strong Development", "C. 19th‑century crisis", "D. Development slows down and is interspersed with crises."], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 12"}}
{"id": "188a751f6234eb5cdbc27fe1600f3754", "question": "Why does Southeast Asia have an important geographic location?", "choices": ["A. Bordering China", "B. Borders India", "C. Adjacent to the Asian monsoon region", "D. Located on the maritime route linking the Indian Ocean and the Pacific Ocean."], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 6"}}
{"id": "2aa59462f9dded4d6b2dc46d430b3ee2", "question": "What is the economic foundation of the ancient Western countries?", "choices": ["A. maritime trade", "B. Agriculture: Rice cultivation", "C. Handicraft industry goods", "D. Handicraft industry and trade"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "SUBJECT", "grade": "Lớp 6"}}
{"id": "532f6138d7b572242fa866900ecf5fc0", "question": "Into which social classes was the society of Âu Lạc divided during the period from the 1st century to the 6th century?", "choices": ["A. Quan again rule, Hào chief Vietnam, Han landlord, collective farmers, dependent farmers, slave", "B. King, Noble families, Farmers and collective workers, Slaves", "C. King, Nobility, Commoners, Slaves", "Officials and rulers, Nobility, Chieftains, Communal farmers, Dependent farmers, Slaves"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 6"}}
{"id": "ba2d9a840cf0e943da2a73c281f72509", "question": "Which country's people responded to Mai Thúc Loan's uprising?", "choices": ["A. Chăm-pa, Chân Lạp", "B. Siam, Cham people", "C. Phù Nam, Miến Điện", "D. Xiêm, Chân Lạp"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 6"}}
{"id": "ddfe41dac446a7b1fc6d317935aa5326", "question": "What is one of the reasons that led to the successful anti‑Qin resistance of the people of Tây Âu and Lạc Việt?", "choices": ["A. Because of the unity and courageous fighting spirit of the people of Western Europe and Lac Viet", "B. Because the Trần family is in a state of crisis.", "C. The Qin forces are weaker than ours and subordinate.", "D. Because the people of Âu Lạc had the help of the divine bow."], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 6"}}
{"id": "2de74f0f21c501b410ddcf3c209cb924", "question": "Who are the three great trees of Đường’s poetic village?", "choices": ["A. Đỗ Phủ, Lý Bạch, Bạch Cư Dị", "B. Đỗ Phủ, Lí Bạch, Vương Hi Chi", "C. Vương Hi Chi, Lí Bạch, Bạch Cư Dị", "D. Đỗ Phủ, Nguyễn Du, Bạch Cư Dị"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 7"}}
{"id": "374dde0becc3ddeede5c78130d2e9fd1", "question": "What was the continuous strategy against the enemy that the Trần dynasty employed in the three early campaigns against the Mongols?", "choices": ["A. The garden is not an empty house.", "B. Organizing the decisive strategic battle", "C. Attack the enemy's supply depot", "D. Block and fight the enemy troops in the capital."], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 7"}}
{"id": "7395ae6491b51ec00087ca16a4c402eb", "question": "What are the two common forms of land ownership during the Trần period?", "choices": ["A. Public land and private land", "B. State land and temple land", "C. Private land and temple land", "D. Public fields and private fields"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 7"}}
{"id": "8574aa99c09008a32f97d24ba7e29614", "question": "Why did patriotism and national pride become the central theme in Đại Việt literature from the 11th to the 15th centuries?", "choices": ["A. Because Đại Việt had to continuously fight against foreign invasion and achieve victory.", "B. Because of the influence of Confucian thought", "C. Because Đại Việt is the strongest country in Southeast Asia", "D. Because of the influence of the Great Han ideology"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 7"}}
{"id": "e0989b8ebca0f5ea9d5b341899933738", "question": "What important event took place in 1075 for the education system of the Ly dynasty?", "choices": ["Open the Quốc tử Giám for my younger noble siblings to come and study.", "B. The first examination department was opened to select officials.", "C. The first university of the nation Đại Việt was established.", "D. The Temple of Literature was built in Thang Long."], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 7"}}
{"id": "33c040944296d606cf3ade79006ef5af", "question": "The form of struggle of this movement is small‑scale, demonstrations, submitting petitions (with millions of signatures) to the National Assembly demanding universal suffrage, wage increases, and reduced working hours for workers (SGK History 7 – page 30).  \nThe above content is a characteristic of which struggle movement?", "choices": ["A. Originated from Li-ông (France) (1831)", "B. Origin of thought Li-ong (France) (1834)", "C. The textile workers' uprising in Sê‑lê‑din (Germany) (1844)", "D. “Constitutional Movement” (England) (1836 – 1846)"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 8"}}
{"id": "3fd517cb3d4d0c6bd2dfd942d32d9bbb", "question": "What directly caused the Xi‑pay uprising to erupt?", "choices": ["A. Xi‑pay soldiers are treated with contempt and disdain by British officers.", "B. The religious beliefs of Xipay soldiers are insulted.", "C. The Xi-pay soldier was taken away to suppress the Indian people's struggle movement.", "D. Binh, a Xi-pay soldier, was taken by the British colonists to make bulletproof covers during the war with France in India."], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 8"}}
{"id": "4ef7ae4a5e6c872dc1763e8f8678c9aa", "question": "What is the nature of the Industrial Revolution of the 18th–19th centuries?", "choices": ["A. The process of transformation from small-scale manual production to large-scale machine production.", "B. The process of formation of the two classes, the bourgeoisie and the workers.", "C. The process of industrialization and modernization of European capitalist countries", "D. The process of forming the main economic foundation of capitalist society: industry and commerce."], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 8"}}
{"id": "69282ba4f2cebfade4da590da28be1bc", "question": "What is the way to resolve the conflicts between the imperialist countries with each other at the beginning of the 20th century?", "choices": ["A. Suppression of the workers' movement", "B. Suppression of the national liberation movement", "C. Conduct World War I (1914-1918)", "D. Competition of monopoly capital conglomerates"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 8"}}
{"id": "774a086de4bb678c79f4add8154d5ae3", "question": "Under what form did British colonial rule India?", "choices": ["A. Direct treatment", "B. Autonomy", "C. Intermediate Value", "D. Dependent"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 8"}}
{"id": "890d890b35e65721516ea726509a597a", "question": "What is the common name for the mass organizations in the Viet Minh Front?", "choices": ["A. Anti-Imperialist Association", "B. Rescue Association", "C. Friends' Association", "D. National Salvation Association"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 9"}}
{"id": "ab487ce3524ce1f18516fe13c40fa40a", "question": "What impact did the victory of the Vietnamese people in the anti‑French colonial war (1945‑1954) have on the colonial system of imperialism?", "choices": ["A. Collapse the colonial system of the old colonialism worldwide.", "B. The beginning of the process of the collapse of the colonial system of old colonialism worldwide.", "C. The beginning of the process of the collapse of the colonial system of the new type of colonialism worldwide.", "D. Collapse the colonial system of the new type of colonialism worldwide."], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 9"}}
{"id": "eec29d8c7a97f6f4be4d38491bb8999e", "question": "What was the purpose of the establishment of the European Economic Community (EEC)?", "choices": ["A. Form a common market, free customs, labor, capital.", "B. Competition with the SEV block", "C. Enhancing the position of Western Europe on the international stage", "D. Competing with the US"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 9"}}
{"id": "ef03b9204196208edbbae218a505dc9c", "question": "What were the prominent characteristics of Vietnam’s situation before the implementation of the reform process (starting in 1986)?", "choices": ["A. Severe crisis", "B. Rapid development", "C. Unstable development", "D. Slow development"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 9"}}
{"id": "ffd46006218ff558fe46f2fb91facd89", "question": "To meet the urgent and long‑term needs of the people, which production sector does the revolutionary government focus on?", "choices": ["A. Agriculture", "B. Industry", "C. Handicraft industry", "D. Trade"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "History", "grade": "Lớp 9"}}
{"id": "13acb782888b5ace9d31863b070173ca", "question": "Given that \\(\\sin a + \\cos a = \\sqrt{2}\\), what is the value of \\(\\sin^4 a + \\cos^4 a\\)?", "choices": ["A. \\(\\frac{3}{2}\\)", "B. 1/2", "C. -1", "D. 0"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 10"}}
{"id": "5787f45ef5164d698560bfd771a072d4", "question": "Find the set of all real values of \\(x\\) for which the proposition \\(P:\\; \"2x - 1 \\ge 0\"\\) is false.", "choices": ["A. \\(x > \\frac{1}{2}.\\)", "B. \\(x \\ge \\frac{1}{2}.\\)", "C. \\(x < \\frac{1}{2}.\\)", "D. \\(x \\le \\frac{1}{2}.\\)"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 10"}}
{"id": "6b21c8dbe7cf05993e2bb1b70a0a0288", "question": "In the coordinate system \\((O;\\vec i;\\vec j)\\), given the vector \\(\\vec a = -\\dfrac{3}{5}\\overrightarrow i - \\dfrac{4}{5}\\overrightarrow j\\). What is the length of vector \\(\\vec a\\)?", "choices": ["A. \\(\\dfrac{1}{5}.\\)", "B. 1.", "C. 6/5.", "D. 7/5."], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 10"}}
{"id": "7b8522e8673d6efb30897f6fc0a7e0ea", "question": "Line Δ is perpendicular to line AB, with A(–2; 1) and B(4; 3). What is a direction vector of line Δ?", "choices": ["A. \\(\\overrightarrow{c} = (1,\\,-3)\\)", "B. \\(\\overrightarrow a = (3; 1)\\)", "C. \\(\\overrightarrow d = (1; 3)\\)", "D. \\(\\overrightarrow b = \\left( {3;\\, - 1} \\right)\\)"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 10"}}
{"id": "c38bfa69c9b7158e1413fd2242dde90a", "question": "When raising experimental fish in a pond, a biologist observed that: If there are $n$ fish per unit area of the pond surface, then on average each fish after a weighing of $P\\left( n \\right) = 360 - 10n$ (gam). How many fish should be released per unit area so that the mass of fish after a harvest is maximized?", "choices": ["A. $12$", "B. $18$", "C. $36$", "D. $40$"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 10"}}
{"id": "216b37c92b474bd528d1da1994576728", "question": "Compute $\\mathop {\\lim }\\limits_{x \\to  + \\infty } \\left( {\\sqrt {{x^2} + x + 3}  - x} \\right)$?", "choices": ["A. $-1.$", "B. $0.$", "C. $\\dfrac{1}{2}.$", "D. $1$"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 11"}}
{"id": "73c331cab1a106c13d23c434edcdcddc", "question": "Which of the following statements is incorrect?", "choices": ["If two distinct planes are both parallel to a third plane, then they are parallel to each other.", "B. If two distinct planes are both parallel to a line, then their line of intersection is also parallel to that line.", "C. If two distinct planes have a common point, then they have infinitely many other common points.", "D. If two distinct lines are both parallel to a plane, then they are parallel to each other."], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 11"}}
{"id": "7fd99f85ed50fafc9778499ff91eb87a", "question": "Given a rectangular box $ABCD.A'B'C'D'$, $AB = 6{\\rm{cm}}$, $BC = BB' = 2{\\rm{cm}}$. Point $E$ is the midpoint of edge $BC$. A regular tetrahedron $MNPQ$ has two vertices $M$ and $N$ lying on line $C'E$, two vertices $P$, $Q$ lying on a line through point $B'$ and intersecting line $AD$ at point $F$. What is the distance $DF$ equal to?", "choices": ["A. $1{\\rm{cm}}$", "B. $2  {\\rm {cm}}$", "C. $3 {\\rm {cm}}$", "D. $6 { \\rm {cm}}$"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 11"}}
{"id": "9c0b042511984874dbae9b945b98d851", "question": "In the plane $Oxy$ the point \\(M(-2;4)\\) is given. The homothety with center $O$ and ratio \\(k = -2\\) transforms point $M$ into which of the following points?", "choices": ["A. (-3;4)", "B. (-4; -8)", "C. (4; -8)", "D. (4;8)"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 11"}}
{"id": "f03297fee14faa6fb9c51a5a320337b5", "question": "Among the following statements, which one is correct?", "choices": ["A. Two intersecting straight lines have a common point.", "B. Two straight lines that have no common point are two straight lines that are parallel or intersecting.", "C. Two lines are parallel to each other when they lie on the same plane.", "D. When two straight lines lie on two distinct planes, then those two straight lines intersect."], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 11"}}
{"id": "172f2ea0ebd9c703ff9994e5a5bd2a88", "question": "If \\(\\int_1^3 f(x)\\,dx = 2\\), then what is \\(\\int_1^3 [f(x)+2x]\\,dx\\)?", "choices": ["A. 20", "B. 10", "C. 18", "D. 12"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 12"}}
{"id": "52e9ae39ba45eb6e908d65418ddb6dd4", "question": "Mr. B’s son was born on January 1, 2019. Starting on February 1, 2019, each first day of the month Mr. B deposits 1 million VND into a savings account for his son at an interest rate of 0.5 % per month. On the son’s 18th birthday he stops depositing and withdraws all the money from the bank. How much money does he withdraw?", "choices": ["A. about 386 million VND", "B. about 390 million VND", "C. about 201 million VND", "D. about 389 million VND"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 12"}}
{"id": "9717a53e26dd64c349d42e11e40b5eb7", "question": "Given the complex number \\(z = (3-2i)(1+i)^2\\). What is the modulus of \\(w = iz + \\overline{z}\\)?", "choices": ["A. 8", "B. \\(2\\sqrt 2 \\)", "C. (1)", "D. √2"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 12"}}
{"id": "c5a379b59d0832082b68f7bd21257e3e", "question": "Given a cone with slant height equal to \\(2a\\) and base radius equal to \\(a\\). What is the volume of the given cone?", "choices": ["A. \\(\\frac{\\sqrt{3}\\pi a^3}{3}\\)", "B. \\(\\dfrac{\\sqrt{3}\\,\\pi\\,a^3}{2}\\)", "C. \\(\\frac{2\\pi a^3}{3}\\)", "D. \\(\\frac{\\pi a^3}{3}\\)"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 12"}}
{"id": "c8e771f68efa236e448c259878e9f9e2", "question": "What is the area of the spherical surface with radius \\(R = 3\\)?", "choices": ["A. 36π", "B. \\(18\\pi \\)", "C. \\(12\\pi \\)", "D. \\(6\\pi\\)"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 12"}}
{"id": "24d82b00d5f92acea4beba39ef83f092", "question": "A store imported $42{\\rm{ }}kg$ flour. The store has sold \\(\\frac{5}{7}\\) of that flour. How many kilograms of flour does the store have left?", "choices": ["A. 12kg", "B. 18 kg", "C. 25kg", "D. 30 kg"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 6"}}
{"id": "266d2f3b17fd21ffaec6a4da659e7b6a", "question": "What is the result of \\(2^4 + 16\\) expressed as a power?", "choices": ["A. 2^20", "B. \\({2^4}\\)", "C. \\({2^5}\\)", "D. \\(2^{10}\\)"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 6"}}
{"id": "6db29dc5124dca05b98e6cd3af624d67", "question": "What is the measure of angle BOC?", "choices": ["A. 140^0", "B. \\({120^0}\\)", "C. \\({35^0}\\)", "D. (130°)"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 6"}}
{"id": "a7f5e44320fc1c0a59426a8943832b75", "question": "How many three‑digit numbers have a digit sum of 10, with the hundreds digit greater than the tens digit, and the tens digit greater than the units digit?", "choices": ["A. 6", "B. 7", "C. 8", "D. 9"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 6"}}
{"id": "d12cce1120fcd1fa7ffbf43443ffcd4b", "question": "Given 9 rays sharing a common origin (no two rays coincide), how many angles are formed?", "choices": ["A. 16", "B. 72", "C. 36", "D. \\(42\\)"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 6"}}
{"id": "0b9aad43f8b84c48de6458b680c3583f", "question": "Among the following fractions, which fraction is not equal to \\(\\frac{2}{5}\\)?", "choices": ["A. \\(\\frac{4}{10}\\)", "B. \\(-\\frac{6}{15}\\)", "C. \\(-\\frac{-4}{10}\\)", "D. \\(\\frac{-6}{-15}\\)"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 7"}}
{"id": "6aa02971a49d4112d4f18d4a4fd99489", "question": "Compare the two angles \\(\\widehat{CAC'}\\) and \\(\\widehat{CBC'}\\)?", "choices": ["A. \\(\\widehat{CAC'} > \\widehat{CBC'}\\)", "B. \\(\\widehat{CAC'} < \\widehat{CBC'}\\)", "C. \\(\\widehat{CAC'} = \\widehat{CBC'}\\)", "D. \\(\\widehat{CAC'} = 2 \\widehat{CBC'}\\)"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 7"}}
{"id": "820257605b02b9553a2bb3f0bd063e83", "question": "What is the sign here?", "choices": ["A. The score obtained after 30 shots by a shooter.", "B. The score obtained after each shot by a shooter", "C. The number of points obtained after 5 shots by a shooter.", "D. The total score achieved by a shooter in rapid‑fire shooting."], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 7"}}
{"id": "a25f8a2268f8cc9f39c0cebccb2821aa", "question": "Given triangle \\(ABC\\) with \\(BC = 1\\,\\text{cm}\\), \\(AC = 8\\,\\text{cm}\\), and the length of side \\(AB\\) is an integer (cm). What type of triangle is \\(ABC\\)?", "choices": ["A. Right triangle at A.", "B. Isosceles triangle at A.", "C. Right isosceles triangle at A.", "D. Isosceles triangle at B."], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 7"}}
{"id": "e59311a6fe458c9d08b2564bb2f24bdd", "question": "What is the absolute value of \\(\\frac{-4}{7}\\)?", "choices": ["A. \\(\\frac{-4}{7}\\)", "B. \\(\\frac{-7}{4}\\)", "C. \\(\\frac{7}{4}\\)", "D. \\(\\frac{4}{7}\\)"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 7"}}
{"id": "3a32010fedd80ad745518cf827d6b3fe", "question": "A rectangular tank has internal dimensions: length $4$ m, width $3$ m, height $2,5$ m. It is known that \\(\\frac{3}{4}\\) of the tank contains water. What is the volume of the part of the tank that does not contain water?", "choices": ["A. $30{m^3}$", "B. $22,5{m^3}$", "C. $7,5{m^3}$", "D. $5,7{m^3}$"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 8"}}
{"id": "577317dde589f737dc1c0ec5a23f4841", "question": "Given a rectangular box \\(ABCD.A'B'C'D'\\). Which edge among these can cut the edge \\(AB\\)?", "choices": ["A. CD", "B. \\(A'A\\)", "C. \\(CC'\\)", "D. \\(C'D'\\)"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 8"}}
{"id": "a85798005162fdaa79dda72b826ad22f", "question": "How many of the following four expressions are polynomials: \\(2x^2 - 3xy;\\, 2x^2 - 3x + 1;\\, -3xy\\) and \\(-\\frac{1}{2x}\\)?", "choices": ["A. 4", "B. 3", "C. 2", "D. 1"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 8"}}
{"id": "aea35936b501c789017e8ebe410ab192", "question": "What shape is the quadrilateral \\(AMBM'\\)?", "choices": ["A. Rhombus", "B. Rectangle", "C. Parallelogram", "D. Trapezoid"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 8"}}
{"id": "db5fe8259314f334ef24caaaf1748c97", "question": "Choose the correct answer. If triangle $ABC$ is similar to triangle \\(A'B'C'\\) by ratio $k$, then the ratio of the perimeters of the two triangles is what?", "choices": ["A. 1", "B. \\(\\frac{1}{k}\\)", "C. \\(k\\)", "D. \\({k^2}\\)"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 8"}}
{"id": "1e959d66e388c135aa458401516a9158", "question": "The equation \\(\\sqrt{4x-8} - 2\\sqrt{\\frac{x-2}{4}} + \\sqrt{9x-18} = 8\\) has solution(s)?", "choices": ["A. \\(x = 8\\)", "B. \\(x = 4\\)", "C. \\(x = 2\\)", "D. \\(x = 6\\)"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 9"}}
{"id": "2f3de651b7971cc13f2ffa8e5c770051", "question": "What are the solutions of the equation \\(5(x+2)\\sqrt{x-1}=x^{2}+7x+10\\)?", "choices": ["A. \\(x = 5;x = 10.\\)", "B. \\(x = 5;x = 10;x =  - 2\\)", "C. \\(x = 5\\)", "D. \\(x = 10\\)"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 9"}}
{"id": "55d2d4be8dd17670be641df79c3ef930", "question": "What is the value of the function \\(y = 2x^2\\) at \\(x = 3\\)?", "choices": ["A. 9", "B. 12", "C. 18", "D. 6"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 9"}}
{"id": "8c37e42e59c732b5ae9f4550a01d8a81", "question": "Given triangle ABC right‑angled at A (AB < AC) inscribed in a circle with center O. Draw line d through A parallel to BC, line d′ through C parallel to BA, and let D be the intersection of d and d′. Draw AE perpendicular to BD (E lies on BD), and let F be the intersection of BD with the circle (O). Choose the correct statement about the product DF·BD?", "choices": ["A. \\(DF.DB = \\dfrac{1}{2}A{B^2}\\)", "B. \\(DF.DB = 4A B^2\\)", "C. \\(DF.DB = A{B^2}\\)", "D. \\(DF.DB = 2A B^2\\)"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 9"}}
{"id": "b1a62363c58e5915bcf88325b29390fc", "question": "A cone and a cylinder have the same base radius and the same height. What is the ratio of the volumes of the cylinder to the cone?", "choices": ["A. 3", "B. \\(\\frac{1}{3}\\)", "C. \\(\\frac{2}{3}\\)", "D. 1"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Mathematics", "grade": "Lớp 9"}}
{"id": "0e32315380702bcc4bba1dd6f4d72cdd", "question": "What is the correct order in the process of writing an essay to persuade others to abandon a habit or a notion?", "choices": ["A. Prepare to write → Write → Find ideas, outline → Edit, finalize", "B. Prepare to write -> Find ideas, draft outline -> Write -> Edit, finalize", "C. Prepare to write -> Write -> Edit, refine -> Find ideas, outline", "D. Prepare to write → Find ideas, create an outline → Edit, refine → Write"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 10"}}
{"id": "131e3c4c20331dc1712e1c67f98f5637", "question": "From which work is the text “Mắc mưu Thị Hến” excerpted?", "choices": ["A. Kim Nham's Boat", "B. Quan Âm Thị Kính's boat", "C. The tuồng play *Nghêu, Sò, Ốc, Hến*", "D. Tuồng play Lưu Bình Dương Lễ"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 10"}}
{"id": "259ab5bec6fa4743407f91fd9fd40c56", "question": "What is the main mode of expression of the text “Thơ duyên”?", "choices": ["A. Self-Report", "B. Commentary", "C. Argumentative essay", "D. Expressions"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 10"}}
{"id": "71414739bf2a810038ef19c8137eb46e", "question": "According to the document “Floating Market – a feature of the water culture of the West,” where does the floating market originate from?", "choices": ["A. From the large buying and selling demand of the local residents.", "B. From the terrain of many streams and canals", "C. From the unusual hobbies of the people", "D. From the people's expertise in traveling on the river"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 10"}}
{"id": "9ae47787571dcd1a4cdcea3fa5b55339", "question": "What topics does Cô‑ba‑y‑a‑si Ít‑sa’s Haiku poetry usually write about?", "choices": ["A. Nature and the unity between nature and humans", "B. Loneliness, solitude", "C. Plants and organisms", "D. All three options above"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 10"}}
{"id": "2ce892a26a2a5c0016a2733ec64f7f91", "question": "In the excerpt “Hạnh phúc của một tang gia,” whom does the author Vũ Trọng Phụng’s sarcastic laughter and anger target?", "choices": ["A. Those who still keep the feudal habit of smuggling.", "B. Those who chase the “modern” – Westernization", "C. Those who, out of greed for wealth and power, lose all humanity.", "D. All three points above"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 11"}}
{"id": "524edef6b59a05589b8a12260d02b987", "question": "What kind of relationship does innocent snow have with the ancient ancestor?", "choices": ["A. Daughter", "B. Daughter-in-law", "C. Granddaughter", "D. Daughter-in-law"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 11"}}
{"id": "a12ee6a6efcb048c6b915ef668c808e7", "question": "Which sound is not present in the scene of the district town at the fading afternoon?", "choices": ["A. Tiếng trống thu không nhỏ dần từ xa vọng lại", "B. The frog’s croak loudly outside the fields, carried by the gentle wind.", "C. The buzzing of mosquitoes", "D. Train whistle"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 11"}}
{"id": "b8e84409cd1251af7e892f5b2d354801", "question": "Ask where the page is to calm the chaos, where is the emptiness?  \nWould you let the black people suffer this fate?", "choices": ["A. Call on the people not to fear the enemy, and to resolve to stand up and drive away the enemy troops.", "B. Criticize the Hue court for not caring about protecting the people, while also expressing the anxious longing for the arrival of the suppression of disorder to save the country.", "C. Want to step in to help the people through the fire and bullets.", "D. Anger and Stalemate before Reality"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 11"}}
{"id": "c1ed9ad34b2c7fdbc1a38e15ff057f6e", "question": "Where was Lê Hữu Trác born?", "choices": ["A. Yên Ninh Village, Bắc Giang Prefecture", "B. Liêu Xá village, Đường Hào district, Thượng Hồng prefecture, Hải Dương province", "C. Bích Câu Ward, Thăng Long", "D. Nhị Khê Village, Thượng Phúc District, Hà Đông"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 11"}}
{"id": "27e48e3b8e0867ce6b908ab96e3adfce", "question": "Which introduction about the Tây Tiến soldiers is the most specific and accurate?", "choices": ["A. Tây Tiến soldiers are farmers throughout all regions.", "B. Tây Tiến soldiers are Hanoi youth", "C. The majority of Tây Tiến soldiers are Hanoi youth, among whom many are students and intellectuals.", "D. Tây Tiến soldiers are intellectual students."], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 12"}}
{"id": "7aba6ef7da5ea1795e656e0b999f3263", "question": "Which type of scientific text does a scientific report belong to?", "choices": ["A. In-depth scientific document", "B. Educational science documents", "C. Popular science text", "D. Literary text"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 12"}}
{"id": "9811d85b4c86f9cbf67d39e301d41a2d", "question": "After eating the human‑blood‑filled bao, what is Thuyên’s condition?", "choices": ["A. Thuyên càng ho rũ rượi hơn", "B. Thuyên eases the cough; Old Hoa intends to buy another cake for Thuyên to eat.", "C. Thuyen could not recover from the illness.", "D. Answer A and C"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 12"}}
{"id": "b4a09a62153b49c6dd0712469906b6da", "question": "What did the Japanese do when a bowl cracked?", "choices": ["A. use glue to reattach the broken pieces", "B. use gold to reattach the broken pieces", "C. discard the broken pieces to pave the floor.", "D. put the scraps into the plant pot."], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 12"}}
{"id": "b6a398c6f251715936b6abf8315dc013", "question": "Why does Lỗ Tấn want to study the medical profession?", "choices": ["A. At age 13, witnessed mother become ill but died because there was no medicine to cure.", "B. At age 13, witnessed his father become ill, but he died because there was no medicine to cure him.", "C. At age 13, I witnessed my grandfather falling ill, but he died because there was no medicine to cure him.", "D. At age 13, I witnessed my maternal grandmother become ill, but she died because there was no medicine to cure her."], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 12"}}
{"id": "7bb45d76d4343256c4cb7337c98a2500", "question": "What is the representative work of Tô Hoài?", "choices": ["A. Cross the waterfall", "B. Hometown", "C. The fox and the bunch of grapes", "D. Cricket's Adventure Story"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 6"}}
{"id": "9dbe27756d9a0ef656a001ebde7445fe", "question": "The final image of the story “The afternoon sun casts the shadows of the three onto the road as a block, like a giant in an ancient tale” evokes which folk song or proverb?", "choices": ["Near ink, it is black; near lamp, it is bright.", "B. One tree alone cannot become a forest; three trees together become a high mountain.", "C. Three đồng for a heap of late worries.  \nSell it, trade it for peace of mind to use.", "D. Bán anh em xa mua láng giềng gần"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 6"}}
{"id": "a03a3a18726f862c156d1a34cb39038c", "question": "Which proverb best fits the lesson drawn from the above story?", "choices": ["A. The Buddha of the home temple is not sacred.", "B. Big fish swallow small fish", "C. Drink water, remember its source.", "D. Nine people, ten opinions."], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 6"}}
{"id": "c0858327f1bec62748b063fce23497b1", "question": "What is a declarative sentence used in the introduction form?", "choices": ["A. I don't feel sad about that.", "B. I am Dế Choắt, a neighbor of Dế Mèn's house.", "C. I continue the journey ahead again.", "D. Dế Choắt is weak to chili like an addict."], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 6"}}
{"id": "c83acb893f9e06a427763a5521975f53", "question": "The work of Nguyên Hồng – the writer of those who share suffering – is quoted from?", "choices": ["A. History of Vietnamese Literature 1930 - 1945", "B. Writer, Thought and Style", "C. Nguyên Hồng and Hai Phong", "D. Collection by Nguyễn Đăng Mạnh"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 6"}}
{"id": "1529b005750af999bfc1ccc22e6149a2", "question": "Find the pronoun in the sentence “My younger sister’s name is Kiều Phương, but I usually call her Mèo because her face is always dirty by herself.”", "choices": ["A. I", "B. I, it", "C. I, Kiều Phương", "D. It, Cat"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 7"}}
{"id": "1bc5cdb43458fbd2715d26e9dd7f79e7", "question": "I’m not seeing any Vietnamese text to translate. Could you please provide the original Vietnamese passage you’d like translated into English?", "choices": ["Children are always the obedient children of their parents.", "B. The child grows up thanks to the love and protection of parents.", "C. Children are a precious gift from mother and father.", "D. The gratitude of parents is incomparable."], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 7"}}
{"id": "35ae89586eae9cdc0f24644d23e57e79", "question": "In the following sentences, which one uses the word correctly?", "choices": ["A. I convince my parents to buy me a new bicycle.", "B. I request my parents to buy me a new bicycle.", "C. I ask my parents to buy me a new bicycle.", "D. I force my parents to buy me a new bicycle."], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 7"}}
{"id": "833c466afb2478145e7d05e90105a59e", "question": "What does folk song number 4 criticize?", "choices": ["A. The dullness", "B. Greed", "C. Calculate the character's appearance", "D. Evilness"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 7"}}
{"id": "fb499b7cf46405bfd80a003f710ef64e", "question": "What message is the dolls’ breakup trying to convey?", "choices": ["A. Children deserve to be loved and protected.", "B. Children need to live in a happy family home.", "C. Children need to live fully, well‑fed.", "D. Children need to be taught very strictly."], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 7"}}
{"id": "0f2269270398422bdcff882746856498", "question": "In the excerpt “Hai cây phong,” the image of the two camphor trees as they appear before people’s eyes is compared by the author to what image?", "choices": ["Like invisible sparks", "B. The lighthouses placed on the mountain", "C. Two giants", "D. Like a tidal wave rising and crashing onto the sandy beach."], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 8"}}
{"id": "402a6f5cbd4b6d9405514e656e31997a", "question": "Which class of speech acts do the sentences in the excerpt “Nước Đại Việt ta” belong to?", "choices": ["A. Promising action", "B. Presentation action", "C. Actions that reveal emotions", "D. Asking action"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 8"}}
{"id": "697dae689896671beceab5f0660ccfed", "question": "Which statement best describes the nature of the story “The Little Match Girl”?", "choices": ["A. The Little Match Girl is a short story with a happy ending.", "B. The Little Match Girl is a fairy tale with a happy ending.", "C. The Little Match Girl is a magical fairy tale.", "D. The Little Match Girl is a fairy tale with a tragic element."], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 8"}}
{"id": "9b2e63ae67006a2b66320ee285da59bf", "question": "What is the main genre of Molière's plays?", "choices": ["A. Tragedy", "B. Comedy", "C. Main argument", "D. Self-Account"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 8"}}
{"id": "b91c54ddbe2662f8cbfd14f377a05d64", "question": "How does the author depict the current situation of the country in the essay “Hịch tướng sĩ”?", "choices": ["A. Peace", "B. Suffering, lamentation", "C. The king is in trouble.", "D. Prosperous nation"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 8"}}
{"id": "482903b90e13d20dc732dbbe0f58969f", "question": "When must a contract document be prepared?", "choices": ["A. When it is necessary to present the situation, events, and the results achieved by an individual or a group.", "B. When you need to present so that superiors or an organization can understand the true nature of the matter.", "C. When it is necessary to convey certain content and requests from the authorized superior to the subordinate.", "D. When you need to negotiate certain transactions"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 9"}}
{"id": "5c54440efc5ca5589c9bf55e7aa1bb64", "question": "Read the following poem and answer the questions:\n\nHold my hand and bury the delta corner of the Mã River  \nHundreds of waterfalls, thousands of cliffs coil and swirl into the net  \nThe village bows down, its shape like an old bamboo before its age  \nThe call of the boat at night shouts across both banks.  \n\nThe shrimp, the son of a lifetime lies askew  \nThe muddy lumps stand straight yet lean  \nMother sweats to outside the singing line  \nMy dream is sweet, the breath of neighbor.  \n\nThe grains of rice, the tubers are placed low  \nAll those when the basket is piled on the head  \nThe small sickle no longer has a place to cut  \nAfter harvesting, the straw and husk bundle together.  \n\n(Một góc phù sa, Nguyễn Minh Khiêm, NXB Hội Nhà văn, 2007)\n\nWhat rhetorical device is used in the line “Làng cong xuống dáng tre già trước tuổi”?", "choices": ["A. Talk too much", "B. Inversion", "C. Humanization", "D. Repetition"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 9"}}
{"id": "5c65bd9b942ad51527d9a6982bdb1921", "question": "What message does the excerpt “Con chó Bấc” send to us?", "choices": ["A. Live fully for youth", "B. You should love yourself", "C. Love and protect animals", "D. Love the natural world"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 9"}}
{"id": "6ba11569ecc41773e5d5ada874b5d97b", "question": "What is the main mode of expression of the text?", "choices": ["A. Self-Account", "B. Description", "C. Expressions", "D. Commentary"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 9"}}
{"id": "ad0c4eac8e6956d23c1fdf84a6d1d769", "question": "In what genre is the work “Những ngôi sao xa xôi” written?", "choices": ["A. Novel", "B. Memoir", "C. Short stories", "D. Drama"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Literature", "grade": "Lớp 9"}}
{"id": "38d99d0a56205e0695fe64aa8ab41295", "question": "Cultivated soil is an irreplaceable factor in agriculture because what is it?", "choices": ["A. Production materials", "B. Labor subjects", "C. Determining the crop structure", "D. the potential for agricultural development"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 10"}}
{"id": "5c16c2649fe8b874750e9c15a82f36f7", "question": "How many time zones are there in the world?", "choices": ["A. 12 o'clock", "B. 18 minutes", "C. 23 minutes", "D. 24 minutes"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 10"}}
{"id": "6a21d86a57ed61d36aaec5cdf0835c50", "question": "Given the following proverb:\n“On the night of the fifth month, before lying down it is already bright  \nOn the tenth day of the month, before laughing it is already dark”\n\nWhat consequence of Earth’s revolution around the Sun does this proverb illustrate?", "choices": ["A. The phenomenon of the sun rising to the zenith", "B. Seasons in a year", "C. Day and night alternate", "D. Day and night lengths differ by season."], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 10"}}
{"id": "cd90e23426949c714dfe2ec55d8fcf4e", "question": "International time (GMT) is calculated according to which time‑zone number?", "choices": ["A. Time zone number 0", "B. Time zone number 6", "C. Time zone number 12", "D. Time zone number 18"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 10"}}
{"id": "e3abdef3f5f4dfe8424205c9d9405db6", "question": "What factor influences the development and distribution of agriculture, serving both as a production force and as a consumption target?", "choices": ["A. Consumer market", "B. land ownership relationships", "C. population - labor", "D. Scientific and technological progress"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 10"}}
{"id": "31bb4ae13ca5704e856f8e9b139ad7d8", "question": "To attract foreign investment and technology, China has?", "choices": ["A. Carry out land reform", "B. Proceed with privatization, implement market mechanism", "C. Establish special economic zones and export processing zones", "D. Build many cities and villages."], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 11"}}
{"id": "74c74a9ed1dfad755f6a2f2c3408667e", "question": "What are the main agricultural products of the Central and Southern plains?", "choices": ["A. wheat, corn, sugar beet", "B. rice, sugarcane, tea, cotton", "C. wheat, rice, sweet soup", "D. corn, millet, sugar beet"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 11"}}
{"id": "7d40d74a92b06c7ea7c6b9b28143f33d", "question": "Which lake is the deepest freshwater lake in the world?", "choices": ["A. Lake Superior", "B. Hồ Victoria", "C. Lake Baikal", "D. Caspian Sea"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 11"}}
{"id": "dbbaaf736bd07956628b1b611542e331", "question": "How many countries border China?", "choices": ["A. 16 countries", "B. 13 countries", "C. 14 countries", "D. 15 countries"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 11"}}
{"id": "eadd6dfe872a12a68e02bf52087afcb2", "question": "The most important reason that African countries remain poor and have underdeveloped economies is because?", "choices": ["A. the long-term domination of colonialism", "B. ethnic conflicts", "C. The weakness in the country's management", "D. The level of education is still low, and the population is growing rapidly."], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 11"}}
{"id": "63155c010cc906ae55a85647ab99543f", "question": "Assuming a ship is out at sea, located 35 nautical miles from the baseline, how far is that ship from the national maritime boundary by straight line?", "choices": ["A. 22,224 m", "B. 42,596 m", "C. 64 820 m", "D. 20,372 m"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography subject", "grade": "Lớp 12"}}
{"id": "7afe8146e7acd48a5bd742777103e7a1", "question": "What factor allows year‑round cultivation, the application of crop‑rotation formulas, and increased yields?", "choices": ["A. Abundant water resources", "B. Abundant Moist Heat", "C. Rich soil resources", "D. Diverse differentiated climate"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "GEOGRAPHY", "grade": "Lớp 12"}}
{"id": "868200a4d202e402d37b51a0bb606c80", "question": "Why must the economic structure be shifted by sector in the Red River Delta?", "choices": ["A. Currently, the industry structure is still largely concentrated in Region III.", "B. Scale and industry structure in the region experiencing imbalance", "C. Along with the reform, industrialization, and modernization campaign.", "D. The economic reality is not in line with the industrialization of the country."], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 12"}}
{"id": "c4d411dca66996609e0a247e5062c7f8", "question": "Which type of transportation is most affected by the deep seasonal variation of the climate?", "choices": ["A. Sea Route", "B. River", "C. Automobile road", "D. Railway"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 12"}}
{"id": "fcf3823d6d4617d6244a547f050e785c", "question": "The difficulties in agricultural production in our country are due to?", "choices": ["A. natural disasters and epidemics", "B. Lack of crop and livestock varieties", "C. lack of farmland for crop cultivation", "D. shortage of labor force"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 12"}}
{"id": "168a826764de3b000ab76449c54b0966", "question": "What is the period for Earth to complete a full orbit around the Sun?", "choices": ["A. 1 month", "B. 1 year", "C. 6 months", "D. 24 hours"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 6"}}
{"id": "3020bb49bf668ffc19c454b1d41587cc", "question": "Why does a hot zone form between two convergent plates?", "choices": ["A. Due to the influence of the Tín Phong wind", "B. Because the terrain surface is mainly continental.", "C. Due to the influence of continental air masses", "D. Because it has a large angle of incidence of sunlight."], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography subject", "grade": "Lớp 6"}}
{"id": "5bbc883d6e1f040f17bac890f2227699", "question": "What question should I ask to answer about the attributes of the object and phenomenon that I am studying?", "choices": ["A. Why?", "B. How?", "C. What?", "D. Where?"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 6"}}
{"id": "b19bc2f191403d429ce3c79ed035f79b", "question": "Assuming a river in a subpolar region floods at the end of summer, the main source of water for the river is from?", "choices": ["A. Snow melts", "B. Rainfall", "C. Ice melt", "D. Groundwater"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography subject", "grade": "Lớp 6"}}
{"id": "fa4a6e83bab89347ec23eff3e0f2b6e5", "question": "What is the main source of water vapor supply to the atmosphere?", "choices": ["A. Sea and ocean", "B. Stream", "C. Organisms", "D. Ponds, lakes, streams"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 6"}}
{"id": "0483e022f182573cadecf12d15d27b2b", "question": "The characteristic of northern Vietnam’s climate having a cold winter is because?", "choices": ["Our country lies at a high latitude in the temperate climate zone.", "B. due to the influence of the cold ocean current", "C. is affected by the Northeast monsoon, which is cold and dry.", "D. The mountainous terrain causes the climate to vary with altitude."], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 7"}}
{"id": "84271423db002d08fdf814984318de8e", "question": "What is the characteristic means of transportation for humans in the desert?", "choices": ["A. lucky week", "B. camel", "C. car", "D. thoroughbred vehicle"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 7"}}
{"id": "b00753338a25cbff1d9dcc1b78f5ab31", "question": "Thanks to the effective implementation of population policy, how has the increase in world population changed?", "choices": ["A. Increasing and moving towards a stable level.", "B. Do not change", "C. Decreasing and losing stability", "D. Gradual decrease and progress towards a stable level."], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 7"}}
{"id": "d5233f51221a7c1697d3e6ffd0cdd8af", "question": "Which Asian country has the world's largest cattle and buffalo herds?", "choices": ["A. China", "B. India", "C. Bra-xin", "D. Indonesia"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 7"}}
{"id": "de29c5c1c7b1ab414b008f567c8f852f", "question": "What are the social consequences of rapid population growth?", "choices": ["A. Exert pressure on issues of eating, dressing, and studying.", "B. Environmental pollution", "C. Suppression of economic development", "D. Resource depletion"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 7"}}
{"id": "0874e9be161dd5e0691cb7a5edce16a3", "question": "How many major stages are there in the history of the development of Vietnam's nature?", "choices": ["A. 2", "B. 3", "C. 4", "D. 5"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 8"}}
{"id": "446bf002933a0e20101759206171398a", "question": "The high mountain scenery appears in the western Tibet plateau area because?", "choices": ["A. Its location deep within the continent means it is less affected by the sea.", "B. High mountain terrain above 4000 m", "C. The Himalayas form a large terrain barrier.", "D. The influence of monsoon circulations"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 8"}}
{"id": "657e7a2f74ee8aa24b91f316b40efd3b", "question": "What is the main reason that Southeast Asian countries had to industrialize?", "choices": ["A. because of the backward economy", "B. because of the world's demands", "C. because of low economic efficiency", "D. because of the consequences of war"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 8"}}
{"id": "c3ba8bff0062546a2d914a77cda0a077", "question": "What is the largest river system in the Northern region?", "choices": ["A. The Red River system", "B. Đồng Nai River System", "C. Mekong River System", "D. Thu Bồn River System"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 8"}}
{"id": "e1aa53e914ff079876c8c8e31d06c00e", "question": "The frog wave function is the result formed by?", "choices": ["A. wind friction", "B. Sea wave abrasion", "C. infiltration of rainwater", "D. friction of the band"], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 8"}}
{"id": "50ad495f43397a1ea3fc981b922d1e35", "question": "What is the main factor that causes the number of tourists visiting Ho Chi Minh City to increase day by day?", "choices": ["A. Convenient geographical location, many historical cultural relics, restaurants and hotels.", "B. High and guaranteed travel insurance policy; fresh air", "C. The location is in the central area of Southeast Asia", "D. The tourism workforce is highly qualified, with a good marketing system."], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "GEOGRAPHY", "grade": "Lớp 9"}}
{"id": "605fb163c63a2bbb68f99370ffa6726b", "question": "How have the results of the Reform initiative impacted our country’s economy?", "choices": ["A. The economy develops slowly, lacks stability, inflation increases.", "B. Attracting foreign investment, creating jobs for workers", "C. Heavily dependent on foreign countries, inflation increases.", "D. Exit the crisis, step by step stabilize and develop"], "answer": "D", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "GEOGRAPHY", "grade": "Lớp 9"}}
{"id": "6dc5d09c3d1e2fa806d35dc278fb2360", "question": "In the production‑value structure of the agriculture sector: the share of industrial crops is rising, while the share of food crops is falling. What does this indicate?", "choices": ["A. The agriculture sector of our country is no longer developing.", "B. Leverage the strengths of tropical agriculture", "C. Food plants no longer play an important role as before.", "D. The production value of the agriculture sector will continue to decline."], "answer": "B", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 9"}}
{"id": "8a01e0bbb637aa3e0f4fc6258a74bb53", "question": "What difficulties do our rivers usually cause for agricultural production activities in the floodplain region?", "choices": ["A. Flood", "B. Salt spray", "C. Wound", "D. Landslide"], "answer": "A", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 9"}}
{"id": "cdd9512177b95863227bb130e115160a", "question": "What causes the nomadic and migratory status of minority ethnic groups to be restricted?", "choices": ["A. The minority ethnic groups move down to the plains to live.", "B. The transition of our country's economic structure", "C. The eastward migration for defense and settlement", "D. Family planning policy"], "answer": "C", "task": "mcq", "task_key": "exams_vi_dev", "metadata": {"subject": "Geography", "grade": "Lớp 9"}}