id stringlengths 2 32 | question stringlengths 24 2k | options stringlengths 40 3.93k | answer stringlengths 1 1.29k | answer_idx int64 0 9 | extra_info stringlengths 63 236 |
|---|---|---|---|---|---|
3f65a51ecc81475684cd19e382fb414e | In 1966, the United Nations Educational, Scientific and Cultural Organization proposed a new equation for the relationship between salinity and chlorinity? | ["S%=1.76000Cl%", "S%=1.80655Cl%", "S%=2.04567Cl%", "S%=1.81000Cl%", "S%=1.87500Cl%", "S%=1.79000Cl%", "S%=1.90000Cl%", "S%=1.84000Cl%", "S%=1.82500Cl%", "S%=1.75000Cl%"] | S%=1.80655Cl% | 1 | {"answer_letter": "B", "difficulty": "easy", "discipline": "Science", "field": "Oceanography", "is_calculation": false, "subfield": "Marine Chemistry"} |
d809903bfa6048e09c3223e67edb8ef4 | Enantiomer separation is the key content of chiral drug research. Which of the following methods does not belong to the absolute configuration study of lead compounds in marine drug research? __ I. Infrared spectroscopy II. Mosher method III. X-ray diffraction IV. Rotational spectroscopy | ["I and II", "II ,III and IV", "I ,II and IV", "Only IV", "Only I", "I ,II and III", "I and IV", "Only II", "Only III", "I and III"] | Only I | 4 | {"answer_letter": "E", "difficulty": "middle", "discipline": "Science", "field": "Oceanography", "is_calculation": false, "subfield": "Marine Biology"} |
901c8770e3f84fcca538b4d4f8b77b72 | _____ are the second largest economically significant category of aquatic creatures after fish. | ["Reptiles", "Insects", "Crustaceans", "Mammals", "Algae", "Corals", "Seaweeds", "Birds", "Mollusks", "Amphibians"] | Mollusks | 8 | {"answer_letter": "I", "difficulty": "middle", "discipline": "Science", "field": "Oceanography", "is_calculation": false, "subfield": "Marine Biology"} |
6bff44235adb4f219d4c041c565f5faf | Assuming a seawater salinity of 35‰, the sound speed decreases uniformly from 1513 m/s at the sea surface to 1476 m/s at a depth of 10 m. Find: the sea surface temperature; the temperature gradient; the horizontal distance traveled by a horizontal sound ray reaching a depth of 10 m; the angle of depression of the sound... | ["15.9\u00b0C,-1.30\u00b0C/m,91.3m,11.5\u00b0", "16.8\u00b0C,-0.85\u00b0C/m,87.6m,13.2\u00b0", "17.3\u00b0C,-1.10\u00b0C/m,92.5m,11.9\u00b0", "16.5\u00b0C,-1.50\u00b0C/m,92.2m,13.1\u00b0", "17.8\u00b0C,-1.00\u00b0C/m,88.7m,12.0\u00b0", "18.1\u00b0C,-1.35\u00b0C/m,90.8m,12.3\u00b0", "15.5\u00b0C,-1.25\u00b0C/m,91.0m,12.... | 17.1°C,-1.24°C/m,89.9m,12.7° | 8 | {"answer_letter": "I", "difficulty": "hard", "discipline": "Science", "field": "Oceanography", "is_calculation": true, "subfield": "Underwater Acoustics"} |
7eb2b2abebbb4d898433898c829ece84 | A rigid ball with a radius of 0.5 meters is placed on the sea floor, and the transceiver is 200 meters away from the ball, and the equivalent joint directional beam width is 0.2 radians. It is known that the undersea backscattering intensity is -30dB, the sound source level is 200dB, and the signal pulse width is 10ms.... | ["92dB,105dB,-5dB", "99dB,98dB,-11dB", "96dB,103dB,-7dB", "93dB,106dB,-4dB", "95dB,104dB,-6dB", "97dB,102dB,-8dB", "91dB,107dB,-3dB", "90dB,108dB,-2dB", "98dB,100dB,-10dB", "94dB,101dB,-9dB"] | 96dB,103dB,-7dB | 2 | {"answer_letter": "C", "difficulty": "hard", "discipline": "Science", "field": "Oceanography", "is_calculation": true, "subfield": "Underwater Acoustics"} |
b45e9c99fafb4e81b669cd6e55717185 | Who is the 19th-century American photographer considered to be the father of documentary photography? | ["Alfred Stieglitz", "Jacob B. Riis", "Jacob Riis", "Matthew A. Brady", "Matthew B. Brady", "Jacob A. Riis", "Alfred B. Stieglitz", "Lewis Hine", "Mathew Brady", "Lewis H. Hine"] | Mathew Brady | 8 | {"answer_letter": "I", "difficulty": "easy", "discipline": "Literature and Arts", "field": "Journalism and Communication", "is_calculation": false, "subfield": "Journalism and News Practice"} |
42b18ca8db5a4653b368ae8c9788278d | What TV show did Kim Fields announce that she was expecting her second son? | ["The Morning Show", "The Tonight Show", "The Real Housewives of New York", "The View", "The Real", "The Real Housewives", "The Real Housewives of Atlanta", "The Talk", "The Today Show", "The Daily Show"] | The Real | 4 | {"answer_letter": "E", "difficulty": "easy", "discipline": "Literature and Arts", "field": "Journalism and Communication", "is_calculation": false, "subfield": "Communication and Broadcasting"} |
ba6fd0635ec7435b949ea88eab03cca9 | In which era did muckraking journalism led to the widespread introduction of public relations in business? | ["The Progressive Era, 1890 - 1920", "The Cold War Era, 1947 - 1991", "Industrial Revolution Era, 1760 - 1840", "The New Deal Era, 1933 - 1939", "The Great Depression Era, 1929 - 1939", "Roosevelt Era, 1930 - 1945", "Seedbed Era, 1900 ' 1917", "Booming Twenties Era, 1919 - 1929", "The Gilded Age, 1870 - 1900", "Postwar... | Seedbed Era, 1900 ' 1917 | 6 | {"answer_letter": "G", "difficulty": "middle", "discipline": "Literature and Arts", "field": "Journalism and Communication", "is_calculation": false, "subfield": "History and Theory of Journalism and Media Management"} |
a3f88c0595554627946639992417801d | Which will be the highest level of embedded advertising? | ["Costume embedding", "Plot embedding", "Dialogue embedding", "Setting embedding", "Cultural embedding", "Character embedding", "Line embedding", "Music embedding", "Scene embedding", "Theme embedding"] | Cultural embedding | 4 | {"answer_letter": "E", "difficulty": "middle", "discipline": "Literature and Arts", "field": "Journalism and Communication", "is_calculation": false, "subfield": "Journalism and News Practice"} |
36f291d2ed444fe0b27574cf714625c5 | Which newspaper is considered the first daily Marxist newspaper? | ["Il Manifesto", "L'Humanit\u00e9", "Granma", "People's Daily", "Pravda", "The Red Flag", "The Daily Worker", "The Morning Star", "Le Monde Diplomatique", "Neue Rheinische Zeitung"] | Neue Rheinische Zeitung | 9 | {"answer_letter": "J", "difficulty": "middle", "discipline": "Literature and Arts", "field": "Journalism and Communication", "is_calculation": false, "subfield": "History and Theory of Journalism and Media Management"} |
811dc2cf0b4b4a048227779aebc96b71 | Direct methods are not suitable for measuring the following surface contaminations: | ["Background radiation level is high.", "Surface temperature is unpredictably volatile.", "Ion exchange resins are depleting fast.", "Electric field interference is significant.", "Loose Surface Contamination", "Dry powders are difficult to assess.", "Fixed Surface Contamination", "Non-ionizing radiation levels are ris... | Background radiation level is high. | 0 | {"answer_letter": "A", "difficulty": "easy", "discipline": "Engineering", "field": "Nuclear Science and Technology", "is_calculation": false, "subfield": "Radiation Protection and Nuclear Technology Applications"} |
e96cd6391ece4af08257d0ac9be3c2ff | The radiation emission process (emission of a proton at frequency) can occur in __ ways. | ["eight", "nine", "six", "one", "two", "ten", "three", "four", "five", "seven"] | two | 4 | {"answer_letter": "E", "difficulty": "easy", "discipline": "Engineering", "field": "Nuclear Science and Technology", "is_calculation": false, "subfield": "Radiation Protection and Nuclear Technology Applications"} |
bab3c50183794d949cb4c21f80773980 | In a hydrogen bomb, deuterium nuclei fuse to produce a helium nucleus. In the process, 5MeV of energy is re-leased per deuterium. If, 1/7000 of natural H is D, how many liters of gasoline (C_8H_18) are needed to be burned to produce the same amount of energy as derived from 1 liter of water. Assume the following: the h... | ["50 liters of gasoline", "350 liters of gasoline", "800 liters of gasoline", "75 liters of gasoline", "150 liters of gasoline", "243 liters of gasoline", "500 liters of gasoline", "400 liters of gasoline", "600 liters of gasoline", "100 liters of gasoline"] | 243 liters of gasoline | 5 | {"answer_letter": "F", "difficulty": "middle", "discipline": "Engineering", "field": "Nuclear Science and Technology", "is_calculation": true, "subfield": "Nuclear Energy and Reactor Technology"} |
358a580c11c649628761e7a303152f5c | Which of the following statements is correct regarding the wearing of personal dosimeters? | ["When dealing with protective apron work, it's necessary to use two dosimeters: one outside the apron for detecting radiation from nearby equipment, and one inside for skin dose tracking.", "For operations requiring a protective apron, two dosimeters are mandated: placing one inside to measure radiation from the envir... | In situations where work is conducted with a protective apron, two dosimeters are required: one worn inside the apron to estimate the equivalent dose for internal organs, and another worn outside the apron to estimate the dose equivalent for skin and eyes. | 4 | {"answer_letter": "E", "difficulty": "middle", "discipline": "Engineering", "field": "Nuclear Science and Technology", "is_calculation": false, "subfield": "Radiation Protection and Nuclear Technology Applications"} |
778f613082fc4f879dce8285c9f6477e | To ensure the effective number of fission neutrons for uranium $\eta=1.7$, what is the estimated mass enrichment of $^{235}\mathrm{U}$ in uranium when using a cross-section at $E_{\bf n}=0.0253 \, \bf eV$? | ["$$1.812\\%$$", "$$2.398\\%$$", "$$1.953\\%$$", "$$0.982\\%$$", "$$3.145\\%$$", "$$1.707\\%$$", "$$2.275\\%$$", "$$1.624\\%$$", "$$1.482\\%$$", "$$0.876\\%$$"] | $$1.707\%$$ | 5 | {"answer_letter": "F", "difficulty": "hard", "discipline": "Engineering", "field": "Nuclear Science and Technology", "is_calculation": true, "subfield": "Nuclear Energy and Reactor Technology"} |
1382c1ee95ea4503b52dbffe6307c154 | A parallel neutron beam with an intensity of $I \ ( \mathbf{m}^{-2} \bullet\mathbf{s}^{-1} )$ is incident on an infinite slab with a thickness of $a$. What is the probability of neutrons eventually diffusing through the slab? | ["$$\n\\frac{L D} {2 \\sinh ( a / L ) + L \\cosh ( a / L )}\n$$", "$$\n\\frac{L\\sinh ( a / L )} {D + 2 \\cosh ( a / L )}\n$$", "$$\n\\frac{2 D} {L \\cosh ( a / L )+2 D \\sinh ( a / L )}\n$$", "$$\n\\frac{D - L} {L \\cosh ( a / L )- D \\sinh ( a / L )}\n$$", "$$\n\\frac{L} {2 D + \\cosh ( a / L ) \\sinh ( a / L )}\n$$"... | $$
\frac{2 D} {L \cosh ( a / L )+2 D \sinh ( a / L )}
$$ | 2 | {"answer_letter": "C", "difficulty": "hard", "discipline": "Engineering", "field": "Nuclear Science and Technology", "is_calculation": true, "subfield": "Nuclear Energy and Reactor Technology"} |
714c2e4442de4a68b5757d2a4d40f34e | Approximately how many pounds of force are required to pull the timer knob from the timer of a LUU-2B/B aircraft parachute flare? | ["30", "20", "50", "55", "10", "15", "45", "25", "40", "35"] | 30 | 0 | {"answer_letter": "A", "difficulty": "easy", "discipline": "Engineering", "field": "Weapon Science and Technology", "is_calculation": false, "subfield": "Military Chemistry and Pyrotechnics"} |
dd791e323c1d4a2da9c101853e2997b0 | What is the average burn time, in minutes, of a MK 25 MOD 3 marine location marker? | ["19.5 TO 25.5", "14.0 TO 19.0", "16.0 TO 22.0", "13.5 TO 18.5", "11.5 TO 17.0", "17.5 TO 23.5", "18.0 TO 24.0", "10.5 TO 14.5", "12.0 TO 16.0", "15.0 TO 20.0"] | 13.5 TO 18.5 | 3 | {"answer_letter": "D", "difficulty": "easy", "discipline": "Engineering", "field": "Weapon Science and Technology", "is_calculation": false, "subfield": "Military Chemistry and Pyrotechnics"} |
cc14e6593d364cbbbfe5786a62ad2325 | Pyrotechnic hazards are frequently increased by which of the following factors? | ["Type of container", "Storage practices", "Load intensity", "Brand reputation", "Location of use", "Method of ignition", "Weather conditions", "Age of pyrotechnic", "Ambient temperature", "Length of usage"] | Age of pyrotechnic | 7 | {"answer_letter": "H", "difficulty": "middle", "discipline": "Engineering", "field": "Weapon Science and Technology", "is_calculation": false, "subfield": "Military Chemistry and Pyrotechnics"} |
c04da671c3974de392704c21457bcab7 | All are components of gun-powder EXCEPT: | ["Aluminum oxide", "Sodium nitrate", "Sulphur", "Potassium nitrate", "Magnesium oxide", "Iron oxide", "Charcoal", "Lead peroxide"] | Lead peroxide | 7 | {"answer_letter": "H", "difficulty": "middle", "discipline": "Engineering", "field": "Weapon Science and Technology", "is_calculation": false, "subfield": "Military Chemistry and Pyrotechnics"} |
30063f1472454e97a8e11d816ad46d18 | Two guns situated at the top of a hill off height $10\ m$, fire one shot each with the same speed of $\sqrt { 3 } { ms }^{ -1 }$ at same interval of time. One gun fires horizontally and other fires upwards at an angle of $60^o$ to with the horizontal. The shots collide in mid air at the point $P$. Taking the origin of ... | ["one shell is fired $1\\ s$ after the firing of the other shell.", "they collide at $P$ whose coordinates are given by $\\left( 5\\sqrt { 3 } ,10 \\right) m$", "they collide at $P$ whose coordinates are given by $\\left( 5\\sqrt { 3 } ,7.5 \\right) m$", "they collide at $P$ whose coordinates are given by $\\left( 5\\s... | they collide at $P$ whose coordinates are given by $\left( 5\sqrt { 3 } ,5 \right) m$ | 9 | {"answer_letter": "J", "difficulty": "hard", "discipline": "Engineering", "field": "Weapon Science and Technology", "is_calculation": true, "subfield": "Weapon Systems Science and Engineering"} |
5f097dc8d393409d887ff30d6ce512f3 | A bomber plane moving at a horizontal speed of 20 m/s releases a bomb at a height of 80 m above ground as shown. At the same instant a Hunter of negligible height starts running from a point below it, to catch the bomb with speed 10 m/s. After two seconds he realized that he cannot make it, he stops running and immedia... | ["65 m/s", "$$70 m/s$$", "50 m/s", "60 m/s", "None of these", "$$20\\sqrt { 10 } m/s$$", "$$10\\sqrt { 10 } m/s$$", "80 m/s", "55 m/s"] | $$70 m/s$$ | 1 | {"answer_letter": "B", "difficulty": "hard", "discipline": "Engineering", "field": "Weapon Science and Technology", "is_calculation": true, "subfield": "Weapon Systems Science and Engineering"} |
de87f79cfcf045c68b41206732f0abe5 | At present, two-half thick-wall bearing bushing is widely used in steel tile shell and which tile lining? | ["Tin bronze", "High tin aluminum alloy", "Chromium nickel coating", "Magnesium iron combination", "Babbitt alloy", "Nickel copper blend", "Silver zinc alloy", "Bronze aluminum mix", "Copper lead alloy", "Low tin steel formula"] | Babbitt alloy | 4 | {"answer_letter": "E", "difficulty": "easy", "discipline": "Engineering", "field": "Naval Architecture and Ocean Engineering", "is_calculation": false, "subfield": "Marine Engineering"} |
d5c04fd4381348eb8e14817c2da0b73d | Given the product title Attwood 14350-3 Medium-Duty Trolling Motor Connector, Female Receptacle, Boat Side, Weather Cover, Face Plate, 12-Volt DC, what product category is it most likely to fall into? | ["marine electrical connector", "toggle switch", "marine electrical accessory", "boat battery charger", "clock", "tracksuit", "outboard engine"] | outboard engine | 6 | {"answer_letter": "G", "difficulty": "easy", "discipline": "Engineering", "field": "Naval Architecture and Ocean Engineering", "is_calculation": false, "subfield": "Marine Engineering"} |
323f109e393647eb9737a213395594ef | Among the ship's resistance, it belongs to the differential pressure resistance | ["Wave resistance and air resistance", "Frictional resistance and wave resistance", "Wave-breaking resistance and viscous resistance", "Compressive resistance and induced resistance", "Surface resistance and pressure resistance", "Frictional resistance and viscous resistance", "Frictional resistance and texture resista... | Viscous resistance and wave resistance | 7 | {"answer_letter": "H", "difficulty": "middle", "discipline": "Engineering", "field": "Naval Architecture and Ocean Engineering", "is_calculation": false, "subfield": "Ship Mechanics and Design Principles"} |
b92c6350571b419f9a51034a37426855 | If a closed system undergoes an irreversible process, releasing 45 kJ of heat to the surroundings while performing 10 kJ of work, the energy change of the system is ____ | ["Zero", "Negative", "Cannot be determined", "Positive"] | Cannot be determined | 2 | {"answer_letter": "C", "difficulty": "middle", "discipline": "Engineering", "field": "Naval Architecture and Ocean Engineering", "is_calculation": true, "subfield": "Marine Engineering"} |
1769114e0de44c4d861440db026f439f | Ship $A$ is traveling northward at a constant speed of $v_A = 15$ km/h, while ship $B$ is moving at a constant speed of $v_B = 12$ km/h along a circular arc track. The angular velocity of its rotation is $10$ degrees per minute. At the position shown in the diagram, the distance between the two ships is $AB = 4$ km. Fi... | ["$$\n-130.1 \\, \\mathbf{j km} / \\mathbf{h}^{2}\n$$\n$$\n320 \\ i- 127.0 \\ \\mathbf{j km} / \\mathbf{h}^{2}\n$$", "$$\n-128.8 \\, \\mathbf{j km} / \\mathbf{h}^{2}\n$$\n$$\n325 \\ i- 123.7 \\ \\mathbf{j km} / \\mathbf{h}^{2}\n$$", "$$\n-123.5 \\, \\mathbf{j km} / \\mathbf{h}^{2}\n$$\n$$\n300 \\ i- 120.0 \\ \\mathbf{j... | $$
-125.7 \, \mathbf{j k m} / \mathbf{h}^{2}
$$
$$
314 \ i- 125.3 \ \mathbf{j k m} / \mathbf{h}^{2}
$$ | 3 | {"answer_letter": "D", "difficulty": "hard", "discipline": "Engineering", "field": "Naval Architecture and Ocean Engineering", "is_calculation": true, "subfield": "Ship Mechanics and Design Principles"} |
74e7cef7cb784edfab1994d35a4cccdd | Above the sandy seabed at 20 meters, there is a line array 10A in length (with a wavelength ⋋ of 6 cm), with a beam aimed at the seabed at a grazing angle of 12°. Given that the source level of the emitted sound is 100 dB and the pulse width is 10 ms, neglecting absorption, find the level of seabed reverberation receiv... | ["9.7dB", "17.5dB", "11.1dB", "13.5dB", "14.6dB", "16.9dB", "15.3dB", "10.8dB", "18.2dB", "12.4dB"] | 12.4dB | 9 | {"answer_letter": "J", "difficulty": "hard", "discipline": "Engineering", "field": "Naval Architecture and Ocean Engineering", "is_calculation": true, "subfield": "Ship Mechanics and Design Principles"} |
ccc95ec9dc3e4286837f1017f7e9a4b7 | In China's environmental air quality standards, based on the size of dust particles, they are classified into Total Suspended Particulate and __________. | ["General Airborne Compounds", "Combustible Dust Material", "Fine Solid Particles", "Concentrated Particle Matter", "Relative Particle Content", "Weighted Particulate Counts", "Total Dissolved Particles", "Respirable Coarse Matter", "Inhalable Particulate Matter", "Fully Suspendible Matter"] | Inhalable Particulate Matter | 8 | {"answer_letter": "I", "difficulty": "easy", "discipline": "Engineering", "field": "Environmental Science and Engineering", "is_calculation": false, "subfield": "Environmental Science"} |
6c5fad7ac19a4c648ed810f46b4b2d4e | According to the 'Classification of Surface Water Bodies and Water Quality Standards' issued by the Environmental Protection Administration in 1985, how many categories are terrestrial surface water bodies classified into? | ["9", "5", "7", "12", "8", "11", "10", "4", "6", "3"] | 5 | 1 | {"answer_letter": "B", "difficulty": "easy", "discipline": "Engineering", "field": "Environmental Science and Engineering", "is_calculation": false, "subfield": "Environmental Science"} |
012e79d3e18f4d189c639409864cc8ec | Which is the correct description of how pH influencing on coagulation? | ["Regardless of coagulant type, base such as sodium hydroxide must neutralize the residual", "With various coagulant systems, alkaline substances like potassium hydroxide are required to balance the OH- accumulation.", "For optimal results with coagulants, acidity should neutralize the OH- released in reactions.", "Wit... | Depending on different kinds of coagulants, Alkaline reagent (lime) should be added to neutralize the H+ from coagulant hydrolysis. | 5 | {"answer_letter": "F", "difficulty": "middle", "discipline": "Engineering", "field": "Environmental Science and Engineering", "is_calculation": false, "subfield": "Environmental Engineering"} |
d9bd2bc758d44a74bbe75bc1fdd7f190 | The device that should be in the secondary digester in a high rate digester is ____. | ["speed indicator", "wind meter", "density meter", "pressure gauge", "humidity reader", "heat regulator", "PH adjuster", "volume control"] | pressure gauge | 3 | {"answer_letter": "D", "difficulty": "middle", "discipline": "Engineering", "field": "Environmental Science and Engineering", "is_calculation": false, "subfield": "Environmental Engineering"} |
ac7d5b56588b40ed99eadf481f31829c | An oil droplet with a particle diameter of $76 \mu\mathrm{m}$ (non-volatile, considered to be rigid) freely settles in atmospheric air at 20°C. During the constant velocity phase, the measured settlement height is $2.7 \mathrm{m}$ within $20 \mathrm{s}$. It is known that at 20°C, the density of water is $998.2 \mathrm{... | ["$$\n0. 0 6 1 4 \\, m\n$$", "$$\n0. 0 4 7 9 \\, m\n$$", "$$\n0. 0 1 9 2 \\, m\n$$", "$$\n0. 0 5 4 3 \\, m\n$$", "$$\n0. 0 1 3 8 \\, m\n$$", "$$\n0. 0 1 5 9 \\, m\n$$", "$$\n0. 0 2 1 1 \\, m\n$$", "$$\n0. 0 7 8 5 \\, m\n$$", "$$\n0. 0 2 5 6 \\, m\n$$", "$$\n0. 0 3 2 0 \\, m\n$$"] | $$
0. 0 1 3 8 \, m
$$ | 4 | {"answer_letter": "E", "difficulty": "hard", "discipline": "Engineering", "field": "Environmental Science and Engineering", "is_calculation": true, "subfield": "Environmental Engineering"} |
4e088c35c77d43bc8c9215189abdb632 | Design an electrostatic precipitator with a gas processing capacity of 6000 cubic meters per minute, requiring a dust removal efficiency of at least 98%, and assuming an effective particle driving speed of 5 meters per minute. What is the total area of the dust collection plate? (Expressed in square meters) | ["4823", "4417", "4694", "3678", "4032", "4761", "4251", "4576", "4892", "5120"] | 4694 | 2 | {"answer_letter": "C", "difficulty": "hard", "discipline": "Engineering", "field": "Environmental Science and Engineering", "is_calculation": true, "subfield": "Environmental Engineering"} |
34baa853c4de44b885e166a420bef9e4 | Highways and primary roads should generally ensure _________. | ["Stopping sight distance", "Meeting sight distance", "Yielding sight distance", "Serving sight distance", "Merging sight distance", "Sharing sight distance", "Turning sight distance", "Passing sight distance", "Breaking sight distance", "Crossing sight distance"] | Stopping sight distance | 0 | {"answer_letter": "A", "difficulty": "easy", "discipline": "Engineering", "field": "Transportation Engineering", "is_calculation": false, "subfield": "Traffic Information Engineering and Control"} |
1f677fc7541c40e2842cffe18008ed84 | The flat sensor of the electromagnetic odometer cannot be installed at the ______ of the echo sounder transducer. | ["front", "back", "left side", "right side", "bottom", "mid part", "upper section", "top", "rear side", "center"] | front | 0 | {"answer_letter": "A", "difficulty": "easy", "discipline": "Engineering", "field": "Transportation Engineering", "is_calculation": false, "subfield": "Traffic Information Engineering and Control"} |
e0fdaf8cf7b046d9a586a35a142d37c2 | The damping factor or attenuation factor of the gyrocompass indicates the speed of the main axis swinging in amplitude reduction on ( ). | ["the azimuth angle", "the dynamic range", "the deflection rate", "the inertial plane", "the elevation angle", "the horizon line", "the sensor lag", "the vertical drift", "the excess fluid angle", "the compass tilt"] | the azimuth angle | 0 | {"answer_letter": "A", "difficulty": "middle", "discipline": "Engineering", "field": "Transportation Engineering", "is_calculation": false, "subfield": "Traffic Information Engineering and Control"} |
db2afd241373431ba196ef7d68bbfdcd | What is the required superelevation for a horizontal curve with a 300-meter radius, a design speed of 80 km/hr, and a coefficient of lateral friction of 0.15? | ["1 in 54.6", "1 in 53.6", "1 in 55.6", "1 in 57.6", "1 in 50.6", "None of the other choices", "1 in 42.6", "1 in 56.6", "1 in 51.6", "1 in 48.6"] | 1 in 55.6 | 2 | {"answer_letter": "C", "difficulty": "middle", "discipline": "Engineering", "field": "Transportation Engineering", "is_calculation": true, "subfield": "Road and Railway Engineering"} |
fb899cab19af4ae1b8e05717803cf5e2 | At a T-shaped intersection, a left-turning car collided with an oncoming vehicle, which left a braking skid mark of 32.5 meters long. The car was equipped with a hydraulic braking system, and the road was a straight, dry asphalt surface. Calculate the speed of the car at the time of collision using the braking skid mar... | ["55.6km/h", "68.3km/h", "50.5km/h", "92.0km/h", "80.7km/h", "85.4km/h", "73.1km/h", "60.2km/h", "66.8km/h", "77.9km/h"] | 73.1km/h | 6 | {"answer_letter": "G", "difficulty": "hard", "discipline": "Engineering", "field": "Transportation Engineering", "is_calculation": true, "subfield": "Traffic Information Engineering and Control"} |
d11b8ab55ae041bf8877dc5645473543 | Parameters of the two-degree-of-freedom car model are as follows:
Total mass $\mathrm{m}=1818.2 \, \mathrm{kg}$
Moment of inertia around axis $o_{z}$ $I_{z}=3885 \, \mathrm{kg} \cdot \mathrm{m}^{2}$
Wheelbase $L=3.048 \, \mathrm{m}$
Distance from the center of mass to the front axle $a=1.463 \, \mathrm{m}$
Distance fro... | ["$$\n\\varepsilon=\\frac{arctg \\Phi - \\frac{\\omega} {\\xi\\omega_{0}}} {\\omega}\n$$", "$$\n\\varepsilon=\\frac{arctg \\omega \\Phi - \\frac{\\xi} {\\omega_{0}}} {\\xi}\n$$", "$$\n\\varepsilon=\\frac{\\xi arctg - \\Phi\\frac{\\omega} {\\omega_{0}}} {\\omega}\n$$", "$$\n\\varepsilon=\\frac{\\Phi\\frac{\\xi\\omega}{a... | $$
\varepsilon=\frac{a r c t g \frac{\omega} {\xi\omega_{0}}-\Phi} {\omega}
$$ | 5 | {"answer_letter": "F", "difficulty": "hard", "discipline": "Engineering", "field": "Transportation Engineering", "is_calculation": true, "subfield": "Vehicle Operation Engineering"} |
fa1e7fc6e9c64f13af5fb870851cc744 | To which mineral family does Yangqishi belong? | ["Pyroxene group", "Pyroxenoid group", "Silicate group", "Garnet group", "Silicate subgroup", "Pyroxenoid subgroup", "Mica group", "Amphibole group", "Pyroxene subgroup"] | Amphibole group | 7 | {"answer_letter": "H", "difficulty": "easy", "discipline": "Science", "field": "Geology", "is_calculation": false, "subfield": "Mineralogy, Petrology, and Economic Geology"} |
ed4af51234ae4b1589f25c5c41a0af17 | which is the class of fold with the degree of curvature greater on the outer arc compared to the inner arc? | ["Class 1", "Class 5", "Class 7", "Class 3", "Class 8", "Class 6", "Class 2", "Class 0", "Class 4", "Class 9"] | Class 3 | 3 | {"answer_letter": "D", "difficulty": "easy", "discipline": "Science", "field": "Geology", "is_calculation": false, "subfield": "Structural Geology"} |
4c742aa9f3394a8fa6660542be1b9e1a | Under coaxial progressive deformation, the long axis of the strain ellipsoid generally corresponds to what? | ["Horizontal stress direction", "Lateral stress axis direction", "Vertical stress direction", "Maximum tensile stress direction", "Maximum shear stress direction", "Minimum compressive stress direction", "Isotropic stress direction", "Principal shear stress direction", "Maximum compressive stress direction", "Intermedi... | Maximum tensile stress direction | 3 | {"answer_letter": "D", "difficulty": "middle", "discipline": "Science", "field": "Geology", "is_calculation": false, "subfield": "Structural Geology"} |
1f27cbb732a148b58d7fc3ab537d8399 | What is the term for the minute strain that occurs in an infinitesimal instant during the process of progressive deformation? | ["Gradual strain", "Infinitesimal strain", "Transient strain", "Non-uniform strain", "Continuous strain", "Progressive strain", "Differential strain", "Cumulative strain", "Finite strain", "Incremental strain"] | Incremental strain | 9 | {"answer_letter": "J", "difficulty": "middle", "discipline": "Science", "field": "Geology", "is_calculation": false, "subfield": "Structural Geology"} |
e49cb39d8e8d4f8f9679c3d625069d90 | An analysis of the rock shows that the relative number of $ Sr^{87}(t_{1/2} = 7.4 \times 10^15 year) $ and $Rb^{87} (t_{1/2} = 4.7 \times 10^15 year) $ atoms is 0.05. What is the age of the rock? Assume all $ Sr^{87} $ to be formed $ Rb^{87} $ only. | ["1.33 \\times 10^9 year", "$$ 3.28 \\times 10^9 year $$", "2.43 \\times 10^9 year", "$$ 4.32 \\times 10^8 year $$", "1.43 \\times 10^{11} year", "5.43 \\times 10^9 year", "1.38 \\times 10^9 year", "1.43 \\times 10^{10} year", "$$ 7.62 \\times 10^9 year $$", "$$ 1.43 \\times 10^9 year $$"] | $$ 1.43 \times 10^9 year $$ | 9 | {"answer_letter": "J", "difficulty": "hard", "discipline": "Science", "field": "Geology", "is_calculation": true, "subfield": "Mineralogy, Petrology, and Economic Geology"} |
e071cac79d7346b3846f423131b02b9e | The Apollo 12 probe collected a rock sample from the Moon, which contains potassium at a concentration of $m(K) = 0.0166 kg$ per kilogram. The fraction of ${^{40}K}$ in the sample is $1.18 \times 10^{-4}$, and the volume of ${^{40} Ar}$ gas collected from the rock sample is $81.9 \times 10^{-7} m^3$ (Equivalent to stan... | ["$$\n7. 0 1 \\times1 0^{9} \\mathrm{~ a}\n$$", "$$\n1. 0 4 \\times1 0^{9} \\mathrm{~ a}\n$$", "$$\n6. 7 5 \\times1 0^{9} \\mathrm{~ a}\n$$", "$$\n5. 4 2 \\times1 0^{9} \\mathrm{~ a}\n$$", "$$\n8. 1 6 \\times1 0^{9} \\mathrm{~ a}\n$$", "$$\n7. 7 4 \\times1 0^{9} \\mathrm{~ a}\n$$", "$$\n9. 2 8 \\times1 0^{9} \\mathrm{~... | $$
7. 9 3 \times1 0^{9} \mathrm{~ a}
$$ | 9 | {"answer_letter": "J", "difficulty": "hard", "discipline": "Science", "field": "Geology", "is_calculation": true, "subfield": "Mineralogy, Petrology, and Economic Geology"} |
3ba0f2ea46fc47269f7d130f6673dc7f | Given a wave series with a significant wave height $ H = 4.7 \text{meters} $ and a significant wave period of 4.7 meters, what is the average wave height of this wave series? | ["2.50 m", "3.50m", "3.76 m", "2.72 m", "2.88 m", "2.45 m", "2.37 m", "2.94 m", "3.16 m", "3.00 m"] | 2.94 m | 7 | {"answer_letter": "H", "difficulty": "easy", "discipline": "Science", "field": "Physical Oceanography", "is_calculation": true, "subfield": "Physical Oceanography"} |
1e37f856ac9c4f149041e5ff0f5be7bb | When the wave steepness exceeds (), the waves will break. | ["1:5", "1:8", "1:6", "1:9", "1:14", "1:10", "1:7", "1:4", "1:12", "1:2"] | 1:7 | 6 | {"answer_letter": "G", "difficulty": "easy", "discipline": "Science", "field": "Physical Oceanography", "is_calculation": false, "subfield": "Physical Oceanography"} |
f2955b825c59490e9e4f14e7c1b984ec | If waves propagate from deep water directly to the shore with a deep-water wave height $ H = 2 \text{m} $ and a period $ T = 10 \text{s} $, what is the wave energy (in terms of power) arriving at a 1 km long coastline? Assume no energy loss during propagation. | ["38350 \\text{N/s}", "$69852 \\text{N/s}$", "38410 \\text{N/s}", "38110 \\text{N/s}", "$65821 \\text{N/s}$", "38280 \\text{N/s}", "38300 \\text{N/s}", "38210 \\text{N/s}", "$22435 \\text{N/s}$", "$38310 \\text{N/s}$"] | $38310 \text{N/s}$ | 9 | {"answer_letter": "J", "difficulty": "middle", "discipline": "Science", "field": "Physical Oceanography", "is_calculation": true, "subfield": "Physical Oceanography"} |
ce653ee8e8d14cae9422f39c55dc91c1 | A semi-enclosed tidal bay has a water depth of 10 m, a length of 222 km, and a tidal range of 4 m at the bay's apex. Three bridges are planned at locations A, B, and C along the bay (represented by the diagram below). The distances are as follows: \( DA = AB = 0.5 \times BC \). If the wave propagation speed is \( c = 1... | ["A: 12 m, B: 10 m, C: 12 m", "A: 11.42 m, B: 9.8 m, C: 11.8 m", "A: 11.42 m, B: 10 m, C: 12.5 m", "A: 11.42 m, B: 10 m, C: 12 m", "A: 11 m, B: 9.5 m, C: 12.5 m", "A: 10.5 m, B: 10 m, C: 12 m", "A: 11.42 m, B: 10 m, C: 11.42 m", "A: 10.5 m, B: 9.8 m, C: 12 m", "A: 12 m, B: 11 m, C: 12 m", "A: 12 m, B: 10.5 m, C: 11.5 m... | A: 11.42 m, B: 10 m, C: 12 m | 3 | {"answer_letter": "D", "difficulty": "middle", "discipline": "Science", "field": "Physical Oceanography", "is_calculation": true, "subfield": "Physical Oceanography"} |
453fc52334c1418097599a9ba4a04007 | According to the dynamic theory of tides, in a narrow and semi-enclosed bay, if the bay experiences a regular semi-diurnal tide with a tidal range of 4m at the head of the bay, a bay length of 20 km, and a bay depth of 8m, what are the maximum tidal current and the maximum tidal range at the mouth of the bay? | ["Maximum tidal current: 0.67 m/s, Maximum tidal range: 4.0 m", "Maximum tidal current: 1.5 m/s, Maximum tidal range: 2 m", "Maximum tidal current: 0.87 m/s, Maximum tidal range: 4.8 m", "Maximum tidal current: 0.65 m/s, Maximum tidal range: 4.1 m", "Maximum tidal current: 0.71 m/s, Maximum tidal range: 3.7 m", "Maximu... | Maximum tidal current: 0.69 m/s, Maximum tidal range: 3.8 m | 9 | {"answer_letter": "J", "difficulty": "hard", "discipline": "Science", "field": "Physical Oceanography", "is_calculation": true, "subfield": "Physical Oceanography"} |
9f54d3c494154d61bf4fb1a7e83263fc | The operating frequency of a single sonar transducer is 30kHz, and the sound source level is 210dB (referenced to 1μPa/m plane wave sound pressure). Assuming spherical spreading, what are the sound pressure levels at 1000m and 5000m? At what distance is the sound pressure level 100dB? At what distance is the loss due t... | ["148 dB,105.0 dB,8000 m,15000 m", "140 dB,109.0 dB,9000 m,16000 m", "145 dB,108.5 dB,7000 m,15000 m", "147 dB,104.5 dB,10000 m,13300 m", "146 dB,106.0 dB,8000 m,15500 m", "139 dB,108.0 dB,6000 m,15200 m", "144 dB,107.5 dB,6000 m,14610 m", "142 dB,105.5 dB,6000 m,14500 m", "141 dB,107.0 dB,5000 m,14700 m", "143 dB,106.... | 144 dB,107.5 dB,6000 m,14610 m | 6 | {"answer_letter": "G", "difficulty": "hard", "discipline": "Science", "field": "Physical Oceanography", "is_calculation": true, "subfield": "Physical Oceanography"} |
4138a596420144a39263d6d3846ea035 | In the process of modulation from E major (including natural major and harmonic major modes) to g harmonic minor, which of the following statements is correct?
① E major can modulate to G major through a pivot chord, and then to g harmonic minor through mode mixture
② There are no common chords between E major and G ma... | ["\u2460\u2462", "\u2461\u2462\u2463", "\u2460\u2461\u2462", "\u2461\u2463"] | ①③ | 0 | {"answer_letter": "A", "difficulty": "easy", "discipline": "Literature and Arts", "field": "Musicology", "is_calculation": false, "subfield": "Harmony"} |
98f12ad48b5842b0930d1f16dc6d752b | In what district was the English songwriter Robert Patrick Weston born? | ["Greenwich", "Camden", "Bethnal Green", "Hackney", "Shoreditch", "Hammersmith", "Islington", "Croydon", "Hoxton", "Kensington"] | Islington | 6 | {"answer_letter": "G", "difficulty": "easy", "discipline": "Literature and Arts", "field": "Musicology", "is_calculation": false, "subfield": "Music History, Education, and Technology"} |
8b6b7c4c02cd4ab9b9c040af249fc90c | Ostinatos are found extensively in the world music of which of the following regions? | ["Mexico", "Ethiopia", "China", "India"] | India | 3 | {"answer_letter": "D", "difficulty": "middle", "discipline": "Literature and Arts", "field": "Musicology", "is_calculation": false, "subfield": "Musical Forms and Analysis"} |
5f890bcab87a47a5bd622a66525e8888 | Which of the following modes are not related by the same tonic? | ["\u266dE Ya-yue Shang mode", "Yan-yue Zhi mode with \u266dG as the Run note", "The pentatonic mode with G as the Jue note", "Qing-yue Yu mode with \u266dG as the Gong note"] | The pentatonic mode with G as the Jue note | 2 | {"answer_letter": "C", "difficulty": "middle", "discipline": "Literature and Arts", "field": "Musicology", "is_calculation": false, "subfield": "Pitch and Scales"} |
57e776dbdcaa411db61f46b5a51a08e1 | If a Neapolitan sixth chord in F minor is used as a pivot chord to modulate to D flat major, what is the function label of the pivot chord in the new key? | ["TS\u2165^6_4", "TSVI_6", "S\u2161_6", "S_6"] | S_6 | 3 | {"answer_letter": "D", "difficulty": "hard", "discipline": "Literature and Arts", "field": "Musicology", "is_calculation": false, "subfield": "Harmony"} |
5df707865b404a0697d8fd1791bb9b0b | Which key does the following group of notes not belong to?
L:1/4
M:2/4
K:C
_e _d | _B F | G z |] %3 | ["f natural minor", "\u266dA melodic major", "f harmonic minor", "F melodic major"] | ♭A melodic major | 1 | {"answer_letter": "B", "difficulty": "hard", "discipline": "Literature and Arts", "field": "Musicology", "is_calculation": false, "subfield": "Pitch and Scales"} |
a2d779bf15c047e48001ba5dbf9bcd71 | What is the correct statement about the Spee curve? | ["For the curve of the mandibular longitudinal occlusion", "From front to back, slightly protruding upwards", "For the curvature of the cervical spine alignment", "For the angle of the maxillary arch contour", "From back to front, slightly protruding forward", "From front to back, slightly protruding forward", "For the... | For the curve of the mandibular longitudinal occlusion | 0 | {"answer_letter": "A", "difficulty": "easy", "discipline": "Medicine", "field": "Stomatology", "is_calculation": false, "subfield": "Clinical Stomatology"} |
87800eee12a249d885b208f0ece667c0 | What is the typical ratio of the crown to the root for the maxillary central incisor? | ["1:5", "1:1", "1:3", "2:1", "6:1", "5:1", "0:1", "1:2", "4:1", "3:1"] | 1:1 | 1 | {"answer_letter": "B", "difficulty": "easy", "discipline": "Medicine", "field": "Stomatology", "is_calculation": false, "subfield": "Clinical Stomatology"} |
0524adb0b6f84991a1633dec217e1f8b | What are the characteristics of deciduous dentition before the age of 4? | ["The teeth are evenly dispersed, without noticeable gaps, the crowns are symmetrical, the dentition curve is subtle, and the distal mesial surfaces of the bicuspid teeth are slightly overlapping.", "The teeth are unevenly positioned, with obvious gaps, the crowns are curved, the dentition curve is pronounced, and the ... | The teeth are closely aligned, without gaps, the crowns are straight, the dentition curve is not obvious, and the distal mesial surfaces of the maxillary and mandibular second molar teeth are aligned with each other in a vertical plane | 2 | {"answer_letter": "C", "difficulty": "middle", "discipline": "Medicine", "field": "Stomatology", "is_calculation": false, "subfield": "Clinical Stomatology"} |
0f09aea2b33a47fa839feccd30df656c | What is the main difference between the three types of chronic apical periodontitis on X-rays primarily observed in? | ["Borders of the radiolucency", "Shape of the radiolucency", "Length of the radiopacity", "Width of the radiolucency", "Coloration of the radiopacity", "Intensity of the radiopacity", "Amount of radiopacity", "Size of the radiolucency", "Density of the radiolucency", "Depth of the radiolucency"] | Borders of the radiolucency | 0 | {"answer_letter": "A", "difficulty": "middle", "discipline": "Medicine", "field": "Stomatology", "is_calculation": false, "subfield": "Basic Stomatology"} |
39f57d82dbc44fc5a41b671766ff3c7d | A 60-year-old female has had swelling of the left upper posterior gingiva and discomfort on biting for 2 weeks. One year ago, she had a history of pain from cold and hot stimuli and night pain, but did not receive treatment. Examination: The palatal gingiva of tooth 26 is swollen, with a fistula pointing in the directi... | ["Chronic periapical abscess", "Chronic periodontal disease", "Chronic periapical abscess with gingival fistula", "Periodontal-endodontic lesion", "Marginal gingivitis", "Furcation involvement", "Chronic periapical abscess with periodontal involvement", "Acute interdental papillitis", "Chronic periapical abscess with p... | Periodontal-endodontic lesion | 3 | {"answer_letter": "D", "difficulty": "hard", "discipline": "Medicine", "field": "Stomatology", "is_calculation": false, "subfield": "Clinical Stomatology"} |
8cb6f2d0bf4e42f48e5d60c9495bd94f | What is the nerve that passes superficially over the internal and external carotid arteries from posterior to anterior, below the angle of the jaw? | ["Superficial temporal artery", "hypoglossal nerve", "Auriculotemporal nerve", "Facial branch of the mandibular nerve", "Glossopharyngeal nerve", "Transverse cervical nerve", "Facial branch of the occipital nerve", "Lateral branch of the superior laryngeal nerve", "Dorsal scapular nerve", "Medial branch of the superior... | hypoglossal nerve | 1 | {"answer_letter": "B", "difficulty": "hard", "discipline": "Medicine", "field": "Stomatology", "is_calculation": false, "subfield": "Clinical Stomatology"} |
ac7b83d25b7d4bc49a76c53920f652e8 | A spawning-inducing agent labeled LRH-A can be identified as (). | ["Neurotransmitter analog", "Chorionic hormone", "Synthetic peptide", "Inhibitory hormone", "Alkaloid derivative", "Analog hormone", "Ester compound", "Pituitary hormone", "Enzyme derivative", "Reserpine hormone"] | Analog hormone | 5 | {"answer_letter": "F", "difficulty": "easy", "discipline": "Agronomy", "field": "Aquaculture", "is_calculation": false, "subfield": "Aquaculture"} |
74476fa1d23e44b5b206953f55ef928a | Which of the following fish has ventral gill slits? | ["Orange clownfish", "White sturgeon", "Yellow tang", "Purple basslet", "Green moray", "Golden puffer", "Black tip shark", "Blue marlin", "Red stingray", "Silver mackerel"] | Red stingray | 8 | {"answer_letter": "I", "difficulty": "easy", "discipline": "Agronomy", "field": "Aquaculture", "is_calculation": false, "subfield": "Aquaculture"} |
948474d51b034cc293e142d63e815503 | The skin of a certain animal is composed of a multi-layered epidermis and dermis. The epidermis contains numerous unicellular mucous glands, and the skin is closely connected to the muscles, with very little subcutaneous tissue. Which of the following animals best matches the description above? | ["Salamander", "Snake", "Lancelet", "Lizard", "Turtle", "Prawn", "Fish", "Spotted Dove", "Frog", "Starfish"] | Fish | 6 | {"answer_letter": "G", "difficulty": "middle", "discipline": "Agronomy", "field": "Aquaculture", "is_calculation": false, "subfield": "Aquaculture"} |
c8e60a6149dc4cbd9dbd794409e32c7e | In addition to using saline solution to disinfect fish fries, they can also be soaked in a ____ potassium permanganate solution for 10 to 20 minutes. | ["25-40ppm", "2-8ppm", "20-35ppm", "30-50ppm", "15-30ppm", "50-60ppm", "10-20ppm", "5-10ppm", "1-5ppm", "0.5-2ppm"] | 10-20ppm | 6 | {"answer_letter": "G", "difficulty": "middle", "discipline": "Agronomy", "field": "Aquaculture", "is_calculation": false, "subfield": "Aquaculture"} |
23a03edfc60f4d6291e8952b7a3d05a2 | The pharyngeal bones of cyprinid fish are formed by the enlargement of the () of the fifth pair of gill arches. | ["Epiglottal bone", "Maxillary bone", "Pharyngobranchial bone", "Hyoidean bone", "Epibranchial bone", "Dental arch bone", "Nasopalatine bone", "Hypobranchial bone", "Palatal arch bone", "Ceratobranchial bone"] | Ceratobranchial bone | 9 | {"answer_letter": "J", "difficulty": "middle", "discipline": "Agronomy", "field": "Aquaculture", "is_calculation": false, "subfield": "Aquaculture"} |
cb48e8cd22b44810857e1889325d0246 | Which model of V-belt has the smallest cross-sectional size? | ["U-type", "V-type", "B-type", "A-type", "Y-type", "Z-type", "X-type", "W-type", "T-type", "S-type"] | Y-type | 4 | {"answer_letter": "E", "difficulty": "easy", "discipline": "Engineering", "field": "Mechanical Engineering", "is_calculation": false, "subfield": "Manufacturing Automation"} |
927fe4f84fa94e9badfe2ee69dcf8f4c | In which factory in China was the first CNC machine tool successfully trial-produced? | ["Shenyang Third Machine Tool Factory", "Shenyang Fifth Machine Tool Factory", "Shenyang Seventh Machine Tool Factory", "Shenyang Sixth Machine Tool Factory", "Shenyang Ninth Machine Tool Factory", "Shenyang First Machine Tool Factory", "Shenyang Fourth Machine Tool Factory", "Shenyang Eighth Machine Tool Factory", "Sh... | Shenyang First Machine Tool Factory | 5 | {"answer_letter": "F", "difficulty": "easy", "discipline": "Engineering", "field": "Mechanical Engineering", "is_calculation": false, "subfield": "Manufacturing Automation"} |
f321dc794f3746e19411eb461012e80f | What is the main disadvantage of a single universal joint? | ["The driving shaft's rotational velocity stabilizes occasionally.", "The driven shaft's angular velocity varies periodically.", "The driven shaft's rotation speed stabilizes consistently.", "The drive shaft's angular momentum varies redundantly.", "The driven shaft's angular momentum changes continuously.", "The drive... | The driven shaft's angular velocity varies periodically. | 1 | {"answer_letter": "B", "difficulty": "middle", "discipline": "Engineering", "field": "Mechanical Engineering", "is_calculation": false, "subfield": "Manufacturing Automation"} |
f42eee5d3a9f4e6fba7d3fef2575ec5f | The four conditions that must be met for the selection of the number of teeth and the number of planetary wheels are (), () () and (). | ["Transmission ratio, adjacency, speed regulation, installation", "Transmission ratio, vibration, engagement, calibration", "Transmission ratio, concentric, adjacent, installation", "Transmission ratio, bearings, lubrication, installation", "Transmission ratio, vibration, balance, engagement", "Transmission ratio, spee... | Transmission ratio, concentric, adjacent, installation | 2 | {"answer_letter": "C", "difficulty": "middle", "discipline": "Engineering", "field": "Mechanical Engineering", "is_calculation": false, "subfield": "Manufacturing Automation"} |
54ee4deda4b84a6a81f71f23966bb979 | A single-tube power amplifier operates in an ambient temperature environment of $\boldsymbol{T}_{a} = 40^{\circ} \mathbf{C}$, with the transistor's maximum junction temperature $T_{j_{M}} = 100^{\circ} \mathbf{C}$. The thermal resistance from the chip to the casing is $R_{j c}=1.5^{\circ} \mathbf{C} / \mathbf{W}$, and ... | ["$$\n= 7 \\mathbf{W}\n$$\nA 2.0mm thick copper heat sink with an area of 470cm\u00b2 can be placed horizontally.", "$$\n= 15 \\mathbf{W}\n$$\nA 3.5mm thick steel heat sink with an area of 260cm\u00b2 can be placed vertically.", "$$\n= 6 \\mathbf{W}\n$$\nA 2.5mm thick copper heat sink with an area of 420cm\u00b2 can be... | $$
= 8 \mathbf{W}
$$
A 2.5mm thick aluminum heat sink with an area of 420cm² can be placed vertically. | 5 | {"answer_letter": "F", "difficulty": "hard", "discipline": "Engineering", "field": "Mechanical Engineering", "is_calculation": true, "subfield": "Mechatronic Engineering"} |
8ed9698ac3594a84ae33baceade4a63e | The meshing device that makes the grinding wheel rotate at high speed is as follows: Rod $IV$ rotates about axis $O_{1}$ with an angular velocity of $\omega_{4}$ using a special handle. At the end of the rod, $O_{2}$ is equipped with a pin, which loosely fits a wheel $II$ with a radius of $r_{2}$. When the handle turns... | ["$$\nr_{1}=\\frac{1} {1 4} r_{3}\n$$", "$$\nr_{1}=\\frac{1} {1 5} r_{3}\n$$", "$$\nr_{1}=\\frac{1} {1 6} r_{3}\n$$", "$$\nr_{1}=\\frac{1} {1 8} r_{3}\n$$", "$$\nr_{1}=\\frac{1} {2 0} r_{3}\n$$", "$$\nr_{1}=\\frac{1} {1 3} r_{3}\n$$", "$$\nr_{1}=\\frac{1} {1 7} r_{3}\n$$", "$$\nr_{1}=\\frac{1} {1 9} r_{3}\n$$", "$$\nr_... | $$
r_{1}=\frac{1} {1 1} r_{3}
$$ | 8 | {"answer_letter": "I", "difficulty": "hard", "discipline": "Engineering", "field": "Mechanical Engineering", "is_calculation": true, "subfield": "Manufacturing Automation"} |
093cd26863a5440db8d01b7b476133e5 | In what year did the aerospace scientist Hans Wolfgang Liepmann receive the Ludwig-Prandtl-Ring Award? | ["1977", "1978", "1963", "1969", "1968", "1967", "1988", "1966", "1965", "1958"] | 1968 | 4 | {"answer_letter": "E", "difficulty": "easy", "discipline": "Engineering", "field": "Aeronautical and Astronautical Science and Technology", "is_calculation": false, "subfield": "Aeronautical and Astronautical Science and Technology"} |
2fdcc6b38a3949a1b04225b244f67155 | What is the full name of the winner of the Space Flight Award in 2005? | ["Charles Elachi Jr.", "Charles Elachi III", "Charles Elachi Jr. Sr.", "Charles Elachi Sr. Jr.", "Charles Elachi Jr. Sr. Jr.", "Charles Elachi V", "Charles Elachi.", "Charles Elachi IV", "Charles Elachi Sr.", "Charles Elachi II"] | Charles Elachi. | 6 | {"answer_letter": "G", "difficulty": "easy", "discipline": "Engineering", "field": "Aeronautical and Astronautical Science and Technology", "is_calculation": false, "subfield": "Aeronautical and Astronautical Science and Technology"} |
0f6dfbb566cc48b9978c5985cbeb0b91 | In high-speed flight, if the angle of attack of the aircraft is 12 degrees and the airflow velocity is 250 meters per second, what is the lift coefficient? | ["2.4", "1.4", "2.0", "2.6", "1.0", "2.2", "1.2", "1.8", "0.8", "1.6"] | 1.2 | 6 | {"answer_letter": "G", "difficulty": "middle", "discipline": "Engineering", "field": "Aeronautical and Astronautical Science and Technology", "is_calculation": true, "subfield": "Aeronautical and Astronautical Science and Technology"} |
0dc8aa6463be482f9f3264da3424fab7 | A liquid-propellant rocket uses 22 lb of fuel per second and 300 lb of oxidant per second.The exhaust gases leave the rocketat 2,000 fps. Calculate the rocket thrust. | ["45,000 lb", "18,000 lb", "15,000 lb", "40,000 lb", "20,000 lb", "25,000 lb", "10,000 lb", "28,000 lb", "30,000 lb", "35,000 lb"] | 20,000 lb | 4 | {"answer_letter": "E", "difficulty": "middle", "discipline": "Engineering", "field": "Aeronautical and Astronautical Science and Technology", "is_calculation": true, "subfield": "Aeronautical and Astronautical Science and Technology"} |
8553c457934f417f998b45b85b13122a | A jet aircraft is flying in the air, emitting a sound power level of 170 dB. Assuming the directivity index is -10 dB in the direction forming a 120° angle with the jet's direction, find the sound pressure level at a distance of 2 miles from the aircraft in that direction. | ["104dB", "88dB", "110dB", "95dB", "69dB", "91dB", "85dB", "72dB", "115dB", "78dB"] | 69dB | 4 | {"answer_letter": "E", "difficulty": "hard", "discipline": "Engineering", "field": "Aeronautical and Astronautical Science and Technology", "is_calculation": true, "subfield": "Aeronautical and Astronautical Science and Technology"} |
98b8cffd08e6447c942367feb0b5bdf1 | A jet plane flying at a constant velocity $v$ at a height $h=8$ kilometer is being tracked by a radar $R$ located at $O$ directly below the line of flight. If the angle $\theta$ is decreasing at the rate of $0.025{rads}^{-1}$, the velocity of the plane when $\theta={60}^{o}$ is | ["$$480km{h}^{-1}$$", "843.91 km {h}^{-1}", "743.91 km {h}^{-1}", "$$1440km{h}^{-1}$$", "833.91 km {h}^{-1}", "720 km {h}^{-1}", "$$793.91 km {h}^{-1}$$", "773.91 km {h}^{-1}", "$$1920km{h}^{-1}$$", "753.91 km {h}^{-1}"] | $$793.91 km {h}^{-1}$$ | 6 | {"answer_letter": "G", "difficulty": "hard", "discipline": "Engineering", "field": "Aeronautical and Astronautical Science and Technology", "is_calculation": true, "subfield": "Aeronautical and Astronautical Science and Technology"} |
f98c51a82077432185fbcddba0400611 | What is the name of the first suspension-type bridge to come across the Jhelum in Srinagar city? | ["Lal Mandi Footway", "Lal Mandi Footbridge", "Lal Mandi Pedestrian Footway", "Zaina Bridge", "Hazratbal Bridge", "Amira Kadal Bridge", "Lal Mandi Pedestrian Footbridge", "Lal Mandi Bridge", "Lal Mandi Pedestrian Bridge", "Zaina Kadal Bridge"] | Lal Mandi Footbridge | 1 | {"answer_letter": "B", "difficulty": "easy", "discipline": "Engineering", "field": "Civil Engineering", "is_calculation": false, "subfield": "Bridge and Tunnel Engineering"} |
ab6a69c8d6264290863a7378006e0bab | What is the flow rate per unit length of the urban water supply pipeline calculated based on the assumption that the water consumption is evenly distributed across all the main pipes? | ["Diameter to flow rate", "Volume to flow ratio", "Average flow rate", "Velocity to flow ratio", "Mass to flow ratio", "Temperature to flow rate", "Area to Flow Ratio", "Pressure to flow ratio", "Length to flow ratio", "Conversion Flow Rate"] | Length to flow ratio | 8 | {"answer_letter": "I", "difficulty": "easy", "discipline": "Engineering", "field": "Civil Engineering", "is_calculation": false, "subfield": "Urban Infrastructure Engineering"} |
25f3f1b4a22a40d7a00cd7cc0f1be103 | The following statement about the state index of cohesive soil is correct (). | ["The smaller the liquid limit, the higher the natural water content in the soil, and the harder the soil texture.", "The smaller the liquid limit, the higher the natural water content in the soil, and the softer the soil texture.", "The greater the liquid limit, the lower the natural water content in the soil, and the... | The greater the liquid limit, the higher the natural water content in the soil, and the softer the soil texture. | 6 | {"answer_letter": "G", "difficulty": "middle", "discipline": "Engineering", "field": "Civil Engineering", "is_calculation": false, "subfield": "Geotechnical Engineering"} |
44eaf53672ff40908452580bb5579b82 | Assuming that the interstices in a clay are of size equal to one tenth the mean diameter of the grain, estimate the height to which water will rise in a clay soil of average grain diameter 0.05 mm. Assume surface tension at air-water interface as 0.073 N/m. | ["$$\n5. 1 9 \\ \\mathrm{m}\n$$", "$$\n7. 4 8 \\ \\mathrm{m}\n$$", "$$\n3. 8 1 \\ \\mathrm{m}\n$$", "$$\n4. 6 2 \\ \\mathrm{m}\n$$", "$$\n7. 0 4 \\ \\mathrm{m}\n$$", "$$\n4. 3 3 \\ \\mathrm{m}\n$$", "$$\n3. 9 7 \\ \\mathrm{m}\n$$", "$$\n5. 9 5 \\ \\mathrm{m}\n$$", "$$\n6. 8 2 \\ \\mathrm{m}\n$$", "$$\n6. 2 7 \\ \\mathr... | $$
5. 9 5 \ \mathrm{m}
$$ | 7 | {"answer_letter": "H", "difficulty": "middle", "discipline": "Engineering", "field": "Civil Engineering", "is_calculation": true, "subfield": "Geotechnical Engineering"} |
ceaad8dfb0af4bedac8dcec0493377b6 | The distribution of foundation soil layers in a certain excavation site and the groundwater level is 0.5m below the surface. The natural unit weight of layers ① and ② is $\gamma=19 \mathrm{kN/m}^{3}$, while the natural unit weight of the silty soil in layer ③ is 17.1 kN/m³. The triaxial consolidated undrained strength ... | ["41.7", "46.1", "42.6", "51.4", "48.8", "39.3", "38.7", "37.9", "44.2", "35.5"] | 42.6 | 2 | {"answer_letter": "C", "difficulty": "hard", "discipline": "Engineering", "field": "Civil Engineering", "is_calculation": true, "subfield": "Geotechnical Engineering"} |
511d31b22ec5430e9626a04e2e7d5699 | The vertical load transmitted from the column to the center of the square foundation is 398kN. Due to structural and foundation requirements, the foundation must be buried 3m underground. Given y=19.42kN/m ^ 3 and c=48kPa of the foundation soil, if the safety factor is set to 3.0, what is the required side length of th... | ["2.89m", "1.74m", "2.58m", "3.16m", "1.25m", "1.92m", "2.03m"] | 1.74m | 1 | {"answer_letter": "B", "difficulty": "hard", "discipline": "Engineering", "field": "Civil Engineering", "is_calculation": true, "subfield": "Geotechnical Engineering"} |
2b84b5fef35540809b38d6dc406fb028 | Position vector of a particle is given by $ ec{r}=a cos\omega t\hat {i}+a sin\omega t\hat {j}$. Which of the following is/are true? | ["velocity vector is parallel to position vector", "acceleration vector is parallel to the position vector", "acceleration vector is directed towards the origin", "acceleration vector is directed away from the origin"] | acceleration vector is directed towards the origin | 2 | {"answer_letter": "C", "difficulty": "easy", "discipline": "Engineering", "field": "Mechanics", "is_calculation": false, "subfield": "Fundamentals of Dynamics and Control"} |
6494ed2de3b5431fb63fa1dd18b5682d | There is a planar flow, $u_{x} = x - 4y \,, \ u_{y} = -y - 4x \,,$ find the velocity potential function $\varphi^{2}$. | ["$$\n\\begin{array} {l} {{\\varphi=x y-\\frac{1} {2} y^{2}+C_{6}}} \\\\ \\end{array}\n$$", "$$\n\\begin{array} {l} {{\\varphi=\\frac{1} {2} x^{2}-\\frac{1} {2} y^{2}-4 x y+C_{1}}} \\\\ \\end{array}\n$$", "$$\n\\begin{array} {l} {{\\varphi=\\frac{1} {2} y^{2}+x^{2}+C_{5}}} \\\\ \\end{array}\n$$", "$$\n\\begin{array} {l... | $$
\begin{array} {l} {{\varphi=\frac{1} {2} x^{2}-\frac{1} {2} y^{2}-4 x y+C_{1}}} \\ \end{array}
$$ | 1 | {"answer_letter": "B", "difficulty": "easy", "discipline": "Engineering", "field": "Mechanics", "is_calculation": true, "subfield": "Theoretical Fluid Mechanics"} |
96fd05e3207d4fef9760441402ae91b8 | A car of mass $1000\ kg$ moving on a circular track of radius $100\ m$ with increase in speed at a rate of $8\ m/s^{2}$, if at an instant its speed is $30\ m/s$ then the acceleration of the car is (at this instant only) | ["$$<12$$", "$$( <10 )$$", "$$( =10 )$$", "$$>12$$", "None of these", "$$=12$$", "$$( =9 )$$", "$$=11$$", "$$<10$$", "$$10$$"] | $$=12$$ | 5 | {"answer_letter": "F", "difficulty": "middle", "discipline": "Engineering", "field": "Mechanics", "is_calculation": true, "subfield": "Fundamentals of Dynamics and Control"} |
445c1798b92c4664b77138dc2589cefc | A point moves along a straight line $x$, with its acceleration changing according to the following rule: $a = ct - k^{2}x$, where $x$ is the coordinate of the point, and $c$ and $k$ are constants. When $t=0$, $x=\dot{x}=0$. Determine the law of motion of the point. | ["$x=\\frac{k}{c^{3}}( ct-\\sin kt )$", "$x=\\frac{c}{k^{2}}( kt-\\sin ct )$", "$x=\\frac{c}{k^{2}}( t-\\cos kt )$", "$x=\\frac{c}{k^{3}}( \\sin kt+kt )$", "$x=\\frac{k}{c^{3}}( kt-\\sin ct )$", "$x=\\frac{k}{c^{2}}( \\sin kt-ct )$", "$x=\\frac{c}{k^{3}}( kt+\\sin kt )$", "$x=\\frac{c}{k^{2}}( \\sin ct-kt )$", "$x=\\fr... | $x=\frac{c}{k^{3}}( kt-\sin kt )$ | 9 | {"answer_letter": "J", "difficulty": "middle", "discipline": "Engineering", "field": "Mechanics", "is_calculation": true, "subfield": "Fundamentals of Dynamics and Control"} |
bb7c1e93ae3d4137809a3db440f61af6 | Four tunnels are supposed to be bored through the earth between two places on a longitude as shown in the figure. One of them with midpoint at $A$ is straight, whereas other three have bent at their midpoints $B, C$ and $D$. Both the bent sections are coplanar. A particle released from one end of the tunnels, spends ti... | ["$$T_A=T_B=T_C=T_D$$", "$$T_A= T_C < T_B > T_D$$", "$$T_B < T_A =T_C < T_D$$", "$$T_B < T_A = T_C > T_D$$", "$$T_A=T_C > T_B= T_D$$", "$$T_A = T_B > T_C = T_D$$", "$$T_B > T_A = T_C > T_D$$", "$$T_B > T_A = T_C < T_D$$"] | $$T_B < T_A =T_C < T_D$$ | 2 | {"answer_letter": "C", "difficulty": "hard", "discipline": "Engineering", "field": "Mechanics", "is_calculation": true, "subfield": "Fundamentals of Dynamics and Control"} |
553890bcac7d43b09d4b9d4eca6c4eb8 | A wedge is placed on a smooth horizontal plain and a rat runs on its sloping side. The velocity of the wedge is $v=4\ m/{s}$
towards the right. What should be the velocity of the rat with respect to the wedge $(u)$, so that the rat appears to move in the
vertical direction to an observer standing on the ground? | ["$$2\\sqrt{2}\\ m/{s}$$", "$$8\\sqrt{2}\\ m/{s}$$", "$$4\\ m/{s}$$", "$$4\\sqrt { 2 } m/{ s }$$", "6\\ m/{s}", "$$4\\sqrt{3}\\ m/{s}$$", "$$8\\ m/{s}$$", "$$2\\ m/{s}$$"] | $$8\ m/{s}$$ | 6 | {"answer_letter": "G", "difficulty": "hard", "discipline": "Engineering", "field": "Mechanics", "is_calculation": true, "subfield": "Fundamentals of Dynamics and Control"} |
ca2e98110e8f40419b62d81437fea972 | The operation of adjusting the suction profile of an injected formation in order to increase the ripple coefficient of the injected water is called? | ["Water Suction Efficiency Adjustment", "Suction Mechanism Profile Adjustment", "Fluid Injection Technique Calibration", "Water Ripple Coefficient Injection", "Formation Profile Suction Adjustment", "Water Suction Profile Management", "Injected Water Ripple Optimization", "Water Injection Efficiency Enhancement", "Suct... | Water Injection Profile Adjustment | 9 | {"answer_letter": "J", "difficulty": "easy", "discipline": "Engineering", "field": "Petroleum and Natural Gas Engineering", "is_calculation": false, "subfield": "Poromechanics and Reservoir Physics"} |
999cc08894e547468e8277ac80a88bf6 | What is a sliding sleeve? | ["Logging tool", "A device used to enhance oil recovery techniques", "A circulating device that communicates the tubing and annulus", "An instrument used for detecting wellbore deviations", "A component designed to adjust wellhead pressure", "A downhole tool used for measuring borehole pressure", "An apparatus for reco... | A circulating device that communicates the tubing and annulus | 2 | {"answer_letter": "C", "difficulty": "easy", "discipline": "Engineering", "field": "Petroleum and Natural Gas Engineering", "is_calculation": false, "subfield": "Oil and Gas Field Development and Storage & Transportation Engineering"} |
6c6cc1808a2047b2abb506c9ae3e42ee | Which equipment is typically used in cryogenic dehydration technology in oil and gas storage and transportation engineering? | ["Gas Separator", "Evaporator", "Distillation Unit", "Desalination Device", "Filter", "Adsorption Column", "Compressor", "Condenser", "Heat Exchanger", "Catalytic Converter"] | Condenser | 7 | {"answer_letter": "H", "difficulty": "middle", "discipline": "Engineering", "field": "Petroleum and Natural Gas Engineering", "is_calculation": false, "subfield": "Oil and Gas Field Development and Storage & Transportation Engineering"} |
fee27e4e6556475182e431ca24ebb9c6 | To maintain the flow of crude oil, the fluid inside the pipeline generally needs to stay at a certain _____. | ["Density", "Magnitude", "Flow rate", "Conductivity", "Humidity", "Altitude", "Pressure", "Temperature", "Turbidity", "Viscosity"] | Temperature | 7 | {"answer_letter": "H", "difficulty": "middle", "discipline": "Engineering", "field": "Petroleum and Natural Gas Engineering", "is_calculation": false, "subfield": "Oil and Gas Field Development and Storage & Transportation Engineering"} |
184f1975d0c941908e9f761be3912589 | A certain $\mathrm{CH_{4}}$ gas storage tank has a volume of 1000 m³ and can withstand a pressure of 103 kPa. If the highest temperature in summer is 41°C and the lowest temperature in winter is -25°C, by how many kilograms does the maximum storage limit of $\mathrm{CH_{4}}$ differ between these two temperatures? | ["$$ 1 6 8. 0 \\ \\mathrm{k g}\n$$", "$$ 1 7 2. 0 \\ \\mathrm{k g}\n$$", "$$ 1 5 6. 0 \\ \\mathrm{k g}\n$$", "$$ 1 7 0. 0 \\ \\mathrm{k g}\n$$", "$$ 1 5 8. 0 \\ \\mathrm{k g}\n$$", "$$ 1 6 6. 0 \\ \\mathrm{k g}\n$$", "$$ 1 8 2. 0 \\ \\mathrm{k g}\n$$", "$$ 1 7 5. 0 \\ \\mathrm{k g}\n$$", "$$ 1 6 3. 0 \\ \\mathrm{k g}\n... | $$ 1 6 8. 0 \ \mathrm{k g}
$$ | 0 | {"answer_letter": "A", "difficulty": "hard", "discipline": "Engineering", "field": "Petroleum and Natural Gas Engineering", "is_calculation": true, "subfield": "Oil and Gas Field Development and Storage & Transportation Engineering"} |
54bfc8311916428a8f2a43c17ca17c7a | A mixture of oil (sp. gr. = 0.88) and air consists of drops of oil witha diameter of 3.5 × 10^-5 ft. If a settling time of 90 seconds is allowed, find the maximum height of the chamberrequired for the oil drops to settle. Take density and viscosityof air as 0.075 lb/ft^3 and 1.2 × 10^-5 lb/ft-s respectively. | ["0.5 ft", "1.8 ft", "0.6 ft", "2.0 ft", "0.8 ft", "1.0 ft", "0.7 ft", "1.2 ft", "0.9 ft", "1.5 ft"] | 0.9 ft | 8 | {"answer_letter": "I", "difficulty": "hard", "discipline": "Engineering", "field": "Petroleum and Natural Gas Engineering", "is_calculation": true, "subfield": "Poromechanics and Reservoir Physics"} |
c69ebc87591440028b02d802f6351492 | In what ways does gender shape the conceptualization of nationhood and conflict? | ["Although often missing from the traditional literature on war and security, women frequently serve the purposes of nationalise causes, with nationalism often presented in highly gendered and female terms, where women are symbols of statehood.", "A sense of national identity can be developed through a variety of share... | Although often missing from the traditional literature on war and security, women frequently serve the purposes of nationalise causes, with nationalism often presented in highly gendered and female terms, where women are symbols of statehood. | 0 | {"answer_letter": "A", "difficulty": "easy", "discipline": "Sociology", "field": "Sociology", "is_calculation": false, "subfield": "Social and Folklore Studies"} |
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