question_id int64 | question string | choices list | answer string |
|---|---|---|---|
2,960 | Genetic variation occurs in bacteria as a result of mutations. This would seem to be the only process giving rise to variation , for bacteria reproduce through binary fission. Design an experiment to support the existence of another process that results in variation. | [
"Artificial genetic modification through genetic engineering techniques",
"Spontaneous mutation",
"Recombination of traits through conjugation",
"Exposure to mutagenic chemicals that induce DNA changes"
] | C |
3,992 | J.G. Dojahn, et al. (J. Phys. Chem. 100, 9649 (1996)) characterized the potential energy curves of the ground and electronic states of homonuclear diatomic halogen anions. The ground state of $\mathrm{F}_2^{-}$is ${ }^2 \sum_{\mathrm{u}}^{+}$with a fundamental vibrational wavenumber of $450.0 \mathrm{~cm}^{-1}$ and equ... | [
"235.1 $\\mathrm{J} \\mathrm{~mol}^{-1} \\mathrm{~K}^{-1}$",
" 199.4 $\\mathrm{~J} \\mathrm{~mol}^{-1} \\mathrm{~K}^{-1}$",
"183.2 $\\mathrm{J} \\mathrm{~mol}^{-1} \\mathrm{~K}^{-1}$",
"220.8 $\\mathrm{J} \\mathrm{~mol}^{-1} \\mathrm{~K}^{-1}$"
] | B |
3,224 | What is mutualism? Give three examples of this type of relationship. | [
"Mutualism is a relationship where one species benefits and the other is harmed. Examples include: the clownfish and sea anemone, oxpeckers and rhinos, and honeybees and flowers.",
"Mutualism is a relationship where one species benefits and the other is unaffected. Examples include: barnacles on whales, remoras o... | C |
4,360 | A perfect gas undergoes isothermal compression, which reduces its volume by $2.20 \mathrm{dm}^3$. The final pressure and volume of the gas are $5.04 \mathrm{bar}$ and $4.65 \mathrm{dm}^3$, respectively. Calculate the original pressure of the gas in bar. | [
"7.10 $\\mathrm{bar}$",
"3.85 $\\mathrm{bar}$",
"2.85 $\\mathrm{bar}$",
" 3.42$ \\mathrm{bar}$"
] | D |
3,354 | There are two highly inbred strains of laboratory mice whose adult body weights are very different. Assume that the mouse's body weight is under the control of three pairs of contrasting genes: A vs. a, B vs. b and D vs. d. Assume further that each capital letter gene is responsible for contributing 5.0 grams to the to... | [
"Strain I: AABB DD, Strain II: aabb dd, F_1 progeny: 20g",
"Strain I: AAbb DD, Strain II: aaBB dd, F_1 progeny: 25g",
"Strain I: AA BB DD, Strain II: aabb dd, F_1 progeny: 22.5g",
"Strain I: AABB, Strain II: aabb, F_1 progeny: 20g"
] | C |
10,563 | The AH Protocol provides source authentication and data integrity, but not | [
"Both C & D",
"Integrity",
"Security",
"Privacy"
] | D |
10,069 | A radioactive sample contains two different isotopes, A and B. A has a half-life of 3 days, and B has a half-life of 6 days. Initially in the sample there are twice as many atoms of A as of B. In how many days will the ratio of the number of atoms of A to B be reversed? | [
"15.0",
"18.0",
"12.0",
"24.0"
] | C |
10,754 | Languages with a structure that implements abstract data types (e.g., a C++ class) can prevent access to components of this structure by all operations except those that are part of this structure. However, definitions of such a structure often contain declarations of components of the structure (e.g., the header file ... | [
"All of the above",
"I only",
"I and III only",
"II and III only"
] | D |
11,821 | A spherical ball, 1 in. in radius and at a temperature of 800°F, is suddenly quenched in a large pool of liquid which ismaintained at 280°F. Estimate the surface temperature of theball after one hour. The average convective heat transfer coefficienth = 2 Btu/hr ft^2°F. The properties of the ball materialare: k = 25 Btu... | [
"600°F",
"417°F",
"650°F",
"280°F"
] | B |
10,178 | Find the ratio of forward-bias to reverse-bias currents when the same voltage 1.5 V is applied in both forward and reverse. Assume room temperature 293 K. | [
"9e+25",
"4.5e+25",
"-6e+25",
"2e+26"
] | C |
3,245 | A biology student observes filamentous appendages on a bacterium and concludes they are flagella. However, he is told that the bacterium is non-motile. He therefore concludes that the flagella are non-operational. Why are both ofhis conclusions incorrect? | [
"The appendages are actually cilia",
"The appendages are vestigial structures from an evolutionary ancestor",
"The filamentous appendages are not flagella, but pili (or fimbriae).",
"The student is observing a form of spore or reproductive structure, not related to motility"
] | C |
10,088 | A rotating mirror experiment, to measure the speed of light, is set up on Mt. Wilson with the return mirror on Mt. San Antonia 35377 meters away. When the 8-face mirror rotates at a speed of 530rpsno shift of the light source is obtained. Calculate the velocity of light. | [
"2.00 ×10^8 m/sec",
"3.00 ×10^8 m/sec",
"1.00 × 10^9 m/sec",
"1.50 × 10^8 m/sec"
] | B |
9,427 | Heat engines, such as a jet engine, are more efficient when run at | [
"high pressures",
"high temperatures",
"low pressures",
"a constant rate"
] | B |
9,434 | The compressions and rarefactions in sound normally travel | [
"in a random direction",
"in a zig-zag pattern",
"in the same direction",
"in a wave-like pattern but not in the same direction"
] | C |
11,748 | Calculate the temperature of a fluid when both a Fahrenheit and a Celsius thermometer are immersed in it, under the following conditions: a) the numerical reading is identical in both thermometers and b) the Fahrenheit reading is numerically twice that of the Celsius reading. Express the values in °R and °K. | [
"a) T = - 40°C or T = - 40°F, T_R= 420, T_K= 233.33 b) TC= 160, T_F= 320 F, T_R= 780, T_K= 433.33",
"a) T = - 30°C or T = - 30°F, T_R= 420, T_K= 233.33 b) TC= 150, T_F= 320 F, T_R= 780, T_K= 433.33",
"a) T = - 40°C or T = - 40°F, T_R= 420, T_K= 243.33 b) TC= 170, T_F= 320 F, T_R= 800, T_K= 433.33",
"a) T = - ... | A |
9,503 | What is the resultant force on a body of mass 48 kg when its ac-celeration is 6 m/sec^2? | [
"252 newtons",
"264 newtons",
"306 newtons",
"288 newtons"
] | D |
3,052 | Which of the following are traits that are affected by more than one gene? | [
"Heterozygous traits",
"Mendelian traits",
"Multiple alleles traits",
"Polygenic traits"
] | D |
11,464 | The intensity of solar radiation at a point in space that is at the mean distance of the earth from the sun is 1.35 × 10^3 J \bullet m^-2 \bullet sec^-1. If radiation from the sun were all at one wavelength, what would be the amplitude of electromagnetic waves from the sun at the position of the earth? | [
"0.01 × 10^3 V \bullet m^-1 and 3.70 × 10^-6Wb\bullet m^-2",
"1.00 × 10^3 V \bullet m^-1 and 3.00 × 10^-6Wb\bullet m^-2",
"1.01 × 10^3 V \bullet m^-1 and 3.37 × 10^-6Wb\bullet m^-2",
"1.11 × 10^3 V \bullet m^-1 and 4.37 × 10^-6Wb\bullet m^-2"
] | C |
11,798 | A screened telephone cable has the following parameters at 10 KHz: L = 0.7 × 10^-3H/Km C = 0.05 × 10^-6 F/Km R = 28 ohm/Km G = 1 × 10^-6 mho/Km. Determine the characteristic impedance, phase constant, and attenuation constant for this cable. | [
"Characteristic impedance: 140 - j50Ω, Attenuation constant: 1.15 dB/Km, Phase constant: 0.41 rad/sec",
"Characteristic impedance: 120 - j36Ω, Attenuation constant: 1 dB/Km, Phase constant: 0.4 rad/sec",
"Characteristic impedance: 130 - j35Ω, Attenuation constant: 1.05 dB/Km, Phase constant: 0.38 rad/sec",
"C... | D |
12,099 | A steel shaft transfers 50 hp to another parallel shaft through gears. The gear equally spaced from the shaft bearings, is 5 in. of diameter and revolves at 1000 rpm. The pressure angle is 25°. Evaluate the force exerted on each bearing. | [
"695 lbs",
"650 lbs",
"620 lbs",
"710 lbs"
] | A |
3,318 | Why would you not expect conjugation among a group of paramecia that had descended from a single individual through repeated fission? | [
"Conjugation is prevented by the presence of a dominant allele",
"Conjugation results in lesser genetic diversity",
"Conjugation can occur among identical organisms",
"All individuals are identical genetically, and conjugation could not occur."
] | D |
9,244 | A lens-gauge graduated indioptersfor glass with index of refraction 1.5 is used to measure the power of a thin double convex lens made of glass with index of refrac-tion 1.6. The readings on the dial are + 4dioptersfor both surfaces of the convex lens. Find the refractive power of the lens, assuming that its thickness ... | [
"4 diopters",
"10 diopters",
"9.6 diopters",
"16 diopters"
] | C |
10,533 | Three of the following are classic security properties; which one is not? | [
"Confidentiality",
"Availability",
"Correctness",
"Integrity"
] | B |
12,230 | A flat plate loses heat to the atmosphere by forced convection. Air at 70°F flows over the plate at the rate of 50 ft/sec. The plate is initially at 212°F. Find (a) the length of the laminar boundary layer thickness on the plate; (b) the local coefficient of heat transfer; (c) the thickness of the velocity boundary lay... | [
"(a) 2.1 ft, (b) 1.64 Btu/hr-ft^2-°F, (c) 0.0148 ft, (d) 0.0165 ft, (e) 3.28 Btu/hr-ft^2-°F",
"(a) 1.9 ft, (b) 1.5 Btu/hr-ft^2-°F, (c) 0.015 ft, (d) 0.017 ft, (e) 3.5 Btu/hr-ft^2-°F",
"(a) 2.6 ft, (b) 1.9 Btu/hr-ft^2-°F, (c) 0.019 ft, (d) 0.021 ft, (e) 3.80 Btu/hr-ft^2-°F",
"(a) 1.7 ft, (b) 1.60 Btu/hr-ft^2-°... | A |
3,753 | A chemist dissolvesPbSin water . TheK_spis found to be 1 × 10-^28 . What is themolarityof each ion in solution ? | [
"5 × 10-^15 M",
"1 × 10-^7 M",
"1 × 10-^14 M",
"4 × 10-^14 M"
] | C |
4,568 | Calculate the heat transferred when 250J of work is done on a system consisting of 1 mole of an ideal gas. At constant temperature, \DeltaE = 0 for the expansion of an ideal gas. | [
"1J",
"500J",
"-250J",
"-500J"
] | C |
11,378 | Let \textphi = x^2 - y^2 be the potential functions for anirrotational flow. Find the velocity components as functions of x, y, and z. | [
"V_x= 2x^2, V_y= -2y^2, V_z= 0",
"V_x= 2y, V_y= -2x, V_z= 0",
"V_x= 2x, V_y= -2y, V_z= 0",
"V_x= x, V_y= y, V_z= z"
] | C |
4,654 | What is the mole fraction of H_2SO_4 in a 7.0 molar solution of H_2SO_4 which has a density of 1.39 g/ml? | [
"0.3",
"0.7",
"0.15",
"0.9"
] | C |
9,232 | "Top gun" pilots have long worried about taking a turn too tightly. As a pilot's body undergoes centripetal acceleration, with the head toward the center of curvature, the blood pressure in the brain decreases, leading to loss of brain function.
There are several warning signs. When the centripetal acceleration is $2 g... | [
"95.67 $\\mathrm{m} / \\mathrm{s}^2$",
"62.48 $\\mathrm{m} / \\mathrm{s}^2$",
"83.81 $\\mathrm{m} / \\mathrm{s}^2$",
"72.14 $\\mathrm{m} / \\mathrm{s}^2$"
] | C |
4,464 | An equilibrium solution of the complex ion Ag(NH_3)_2^+ contains 0.30 M of NH_4^+ and 0.15 M of the actual ^+complex ion. To obtain a concentration of Ag^+ equal to 1.0 × 10^-6 M, what must the pH of this solution be?K_dissof Ag(NH_3)_2^+ = 6.0 × 10^-8, K_b of NH_3 = 1.8 × 10^-5 and K_W = 1 × 10^-14. | [
"7.45",
"10.50",
"6.90",
"8.76"
] | D |
10,531 | Which of the following is not a block cipher operating mode? | [
"ECB",
"CFB",
"CBF",
"CBC"
] | C |
9,256 | What do meteorites reveal about the solar system? | [
"They reveal that the solar system was once part of a larger galaxy.",
"They reveal that all planets in the solar system once had life.",
"They reveal that the age of the solar system is approximately 4.6 billion years.",
"They reveal that the solar system is expanding at a constant rate."
] | C |
4,137 | (a) Derive the expression (\partialE/\partialT)_P = C_P - P (\partialV/\partialT)_P (b) Calculate (C_P - C_V) for Cu at 20°C Density of Cu = 8.934 (kg / liter) Mass of Cu = 29 × 10^-3 kg mol^-1 \alpha = 50.1 × 10^-6 K^-1\beta = 0.7 × 10^-6 atm^-1 | [
"0.446J mol^-1K^-1",
"0.346J mol^-1K^-1",
"0.656 J mol^-1 K^-1",
"0.546 J mol^-1 K^-1"
] | B |
10,253 | The potential energy of a compressed spring and the potential energy of a charged object both depend on | [
"the work done on them",
"Both of these",
"Neither of these",
"the force applied to them"
] | A |
3,074 | Given a population in genetic equilibrium in which the initial gene frequency of d is 0.2; assume the rate of mutation (u) of D \rightarrow d to be 4.1 × 10^-5, and the rate of back mutation (v) of d \rightarrow D to be 2.5 × 10^-7. (a) If the above rates of mutation are introduced into the population, what will be the... | [
"0.00003275, .9939",
"0.0000325, .9942",
"0.000034, .9941",
"0.000033, .9938"
] | A |
4,176 | Calculate the magnitude of the spin angular momentum of a proton. Give a numerical answer. | [
"14.22 $10^{-35} \\mathrm{~J} \\mathrm{~s}$",
"7.89 $10^{-35} \\mathrm{~J} \\mathrm{~s}$",
"6.25 $10^{-35} \\mathrm{~J} \\mathrm{~s}$",
" 9.13 $10^{-35} \\mathrm{~J} \\mathrm{~s}$"
] | D |
12,122 | The normal voltage used in directional heating is | [
"1.5 KV.",
"66 KV.",
"77 KV.",
"500 KV."
] | A |
4,189 | A saturated solution of CaF_2 contains .00168g of CaF_2 per 100g of water. Determine theK_sp. | [
"2.11 × 10^-8",
"2.73 × 10^-8",
"1.08 × 10^-8",
"3.92 × 10^-8"
] | D |
12,102 | A driver applies brakes and slows down the car at a constant rate of 25 fps^2 till it comes to rest. The car weighs 3500 lbs. and its average speed is 55 mph. If the drum diameter is 10 in., band face width and thickness are 2 in. and (1 / 4) in. respectively, determine the following: (a) the temperature increase in th... | [
"Temperature increase: 110°F, Mean rate of power absorption in the first second: 350 hp, Average power absorbed overall: 210 hp",
"Temperature increase: 65°F, Mean rate of power absorption in the first second: 250 hp, Average power absorbed overall: 140 hp",
"Temperature increase: 99°F, Mean rate of power absor... | C |
10,209 | Our current best observations show that Pluto has | [
"two large satellites and one small satellite.",
"one medium sized satellite and two small satellites.",
"one large satellite and one small satellite.",
"no satellites."
] | B |
3,477 | In certain abnormal conditions, the stomach does not secretehydrochloric acid. What effects might this haveon thedigestive process? | [
"The absence of HCl would enhance protein digestion",
"The absence of HCl would have no impact on the digestion and absorption of carbohydrates.",
"The absence of HCl would lead to some loss of protein digestion, less direct effect on the conformation of proteins, decreased ability to kill ingested bacteria, an... | C |
3,443 | Fungi participate in each of the following EXCEPT | [
"photosynthesis to produce glucose",
"fermentation to produce alcohol",
"association with humans to produce ringworm",
"association with the roots of plants to form mycorrhizae"
] | A |
9,551 | Satellites in circular Earth orbit maintain a constant speed because gravitational force on them is | [
"changing with the altitude of the satellite",
"without a component of force along their circular path",
"practically zero",
"appreciably weaker than at Earth’s surface"
] | B |
3,656 | The barometric formula relates the pressure of a gas of molar mass $M$ at an altitude $h$ to its pressure $p_0$ at sea level. Derive this relation by showing that the change in pressure $\mathrm{d} p$ for an infinitesimal change in altitude $\mathrm{d} h$ where the density is $\rho$ is $\mathrm{d} p=-\rho g \mathrm{~d}... | [
"0.33",
" 0.72",
"0.25",
"0.58"
] | B |
11,593 | Copper normally solidifies at a temperature of 1356°K, but canexist in the super-cooled liquid form up to a temperature of1120°K, after which it starts solidifying spontaneously. Determine the entropy change for the solidification of copper atits temperature of spontaneous solidification (1120°K). Use the following dat... | [
"- 2.50 cal deg^-1 mole^-1",
"- 2.09 cal deg^-1 mole^-1",
"- 2.23 cal deg^-1 mole^-1",
"- 1.95 cal deg^-1 mole^-1"
] | C |
3,979 | Without Catalyst(k), sec^-1 With Catalyst(k_c), sec^-1 T_1 = 473°K 1.76 × 10^-2 6.10 T_2 = 573°K 0.804 88.1 The reaction rate of a first-order reaction at a con-stant pressure of 1atmis shown in the table above. Cal-culate the value of H and S° with and without catalyst, assuming that they do not change with temperatur... | [
"H = 19.6 kcal/mole, 13.4 kcal/mole; S = 34.9eu, 33.4eu",
"H = 23.5 kcal/mole, 16.2 kcal/mole; S = 37.1eu, 36.5eu",
"H = 18.2 kcal/mole, 12.8 kcal/mole; S = 33.3eu, 32.7eu",
"H = 20.6 kcal/mole, 14.4 kcal/mole; S = 35.5eu, 34.0eu"
] | D |
9,131 | Astrophysical theory suggests that a burned-out star whose mass is at least three solar masses will collapse under its own gravity to form a black hole. If it does, the radius of its event horizon is X * 10^3 m, what is X? | [
"7.7",
"14.8",
"9.4",
"8.9"
] | D |
11,486 | Use the derivative property of Laplace transforms to solve the differential equation y' - y = e^-x(1) where y(0) = 0 is the initial value of y. | [
"sinh x",
"e^x - e^-x",
"e^x + x",
"x^2 e^x"
] | A |
3,203 | A healthy man and woman are worried about having children because they are both carriers of sickle-cell disease. If the couple have a biological child, what is the chance that the child will inherit sickle-cell disease? | [
"80%",
"75%",
"50%",
"25%"
] | D |
4,585 | The escape velocity, the speed at which molecules can escape the earth's gravitational field, is approximately 1.1 × 10^6 cm sec^-1 (about 7 miles sec^-1). At what temperature, approximately, will the root mean square velocity value for H_2 be equal to the escape velocity? (R = 8.3 × 10^7 erg mole^-1 deg^-1 ; at. wt: H... | [
"1.50 × 10^4 K",
"1.20 × 10^4 K",
"9.72 × 10^3 K",
"3.00 × 10^5 K"
] | C |
10,753 | Consider a computer system in which processes can request and release one or more resources. Once a process has been granted a resource, the process has exclusive use of that resource until it is released. If a process requests a resource that is already in use, the process enters a queue for that resource, waiting unt... | [
"Giving priorities to processes and ordering the wait queues by priority",
"Numbering the resources and requiring that processes request resources in order of increasing number",
"Having a process request all its required resources when it first begins, and restarting if it cannot obtain them all",
"Allowing ... | A |
11,685 | A negative point charge of 10^-6 coulomb is situated in air at theorigin of a rectangular coordinate system. A second negativepoint charge of 10^-4 coulomb is situated on the positivex axis at a distance of 50 cm from the origin. Whatis theforce on the second charge? | [
"3.6newtons",
"3.2 newtons",
"1.2 newtons",
"1.6newtons"
] | A |
11,724 | A flat plate 1.5 ft long and 5 ft wide is placed in a stream of water flowing at a velocity of 45 ft/s, such that the flow of water is parallel to the 1.5 ft. side of the plate. Calculate: a) the boundary layer thickness at the trailing edge. b) the drag force acting on the plate if the laminar boundary layer region en... | [
"a) 0.022 ft, b) 84 lb_f, c) 93 lb_f, d) 165 lb_f",
"a) 0.0257 ft, b) 89.56 lb_f, c) 97.1 lb_f, d) 173.7 lb_f",
"a) 0.028 ft, b) 92 lb_f, c) 102 lb_f, d) 178 lb_f",
"a) 0.03 ft, b) 88 lb_f, c) 95 lb_f, d) 170 lb_f"
] | B |
10,023 | With what force does the Earth attract the moon? | [
"1.2 × 10^25 dynes",
"5.0 × 10^25 dynes",
"3.0 × 10^25 dynes",
"2.0 × 10^25 dynes"
] | D |
9,555 | You throw a ball from your window $8.0 \mathrm{~m}$ above the ground. When the ball leaves your hand, it is moving at $10.0 \mathrm{~m} / \athrm{s}$ at an angle of $20^{\circ}$ below the horizontal. How far horizontally from your window will the ball hit the ground? Ignore air resistance. (Unit: m) | [
"15.0",
"9.2",
"13.7",
"6.8"
] | B |
3,969 | The melting point of monoclinic sulfur at a pressure of 1atm is 119.3°C. The change in volume during fusion is 41 cm^3 kg^-1 and\DeltaH_fusis 422 cal mol^-1 . Find the melting point of sulfur when the pressure is raised to 1000 atm. | [
"180 °C",
"150 °C",
"120 °C",
"200 °C"
] | B |
2,995 | A healthy person sitting at rest consciously begins to breathe too fast. Which of the following describes the change in the person’s blood caused by this hyperventilation? | [
"No change in both partial pressure of carbon dioxide and concentration of hydrogen ions",
"A decrease in partial pressure of carbon dioxide and a decrease in concentration of hydrogen ions",
"No change in partial pressure of carbon dioxide and an increase in concentration of hydrogen ions",
"A decrease in pa... | B |
4,663 | The daily protein intake of a typical American diet consists of meat, dairy products and eggs. Its average net protein utilization (NPU) is 70. If the daily protein requirement of the body is 0.3 g per pound of body weight, what is the actual protein requirement for an average American? | [
"100 g of protein per day",
"70 g of protein per day",
"64.5 g of protein per day",
"0.43 g of protein per day"
] | C |
2,894 | The percentage of successful single pairmatingsobserved forone hour in Drosophilamelanogastercultures showed thefollowing: Matings Before crossing wild stock with yellow stock for 7generations After crossing wild stock with yellow stock for 7generations WT male × WT female 62 75 Yellow male × WT female 34 47 WT male × ... | [
"Wild-type females are less successful in mating with yellow males.",
"The males with the yellow mutation are less successful in mating with wild-type gray females than are wild-type males.",
"Yellow females prefer to mate with yellow males, leading to higher success rates.",
"Wild-type males preferentially m... | B |
9,753 | A solid glass sphere of radius R and index of refraction 1.50 issilvered over one hemisphere. A small object is located on theaxis of the sphere at a distance 2R from theunsilvered surface. Find the position of the image formed by the refractingand reflecting surfaces. | [
"4R from the mirror surface",
"R from the spherical glass surface",
"2R from the mirror surface",
"2R from the spherical glass surface"
] | D |
3,495 | Proteins were shown to move about in a plane of the plasma membrane when mouse cellsurface proteins and human cell-surface proteins were observed to integrate along a fused mouse-human cell plasma membrane. Which of the following cell culture techniques was most likely employed in order to yield these results? | [
"Inserting a bacterial plasmid into a mammalian cell",
"Producing a hybrid cell",
"Injecting a fluorescent marker into the cell membrane",
"Producing a heterokaryon"
] | D |
4,131 | Find the pH of 0.15 M H_2SO_4, solution, assuming K_2 =1.26 × 10^-2. | [
"2.87",
"0.79",
"1.75",
"2.30"
] | B |
3,562 | Assume that all gases are perfect and that data refer to 298.15 K unless otherwise stated. Consider a system consisting of $2.0 \mathrm{~mol} \mathrm{CO}_2(\mathrm{~g})$, initially at $25^{\circ} \mathrm{C}$ and $10 \mathrm{~atm}$ and confined to a cylinder of cross-section $10.0 \mathrm{~cm}^2$. It is allowed to expan... | [
"+0.30$\\mathrm{J} \\mathrm{K}^{-1}$",
"+0.90$\\mathrm{J} \\mathrm{K} \\mathrm{K}^{-1}$",
" +0.60$\\mathrm{J} \\mathrm{K} \\mathrm{K}^{-1}$",
"+1.50$\\mathrm{J} \\mathrm{K}^{-1}$"
] | C |
3,191 | A biology student from Nebraska, vacationing at a Virginia beach, observes that the level of activity of a fiddler crab changes with the cycle of the tides. When he brings some crabs back with him to Nebraska, he notices that a similar activity cycle is shown, yet there are no ocean beaches for miles. Explain. | [
"The crab's activity cycle is influenced by barometric pressure changes",
"The crab's activity cycle is synchronized with the coastal tides they were originally exposed to",
"The crab's activity cycle is determined by the moon's gravitational pull",
"The crab's activity is random and shows no particular cycle... | C |
3,259 | Why are the elements carbon, hydrogen, oxygen, and nitrogen (C, H, O, N) of immense importance in living matter ? | [
"These elements make up the majority of non-living matter.",
"Carbon, hydrogen, oxygen and nitrogen are the four most abundant elements in living organisms, make up about 99 percent of the mass of most cells, and can readily form covalent bonds by electron pair sharing.",
"These elements are rare and precious."... | B |
4,382 | The protein human plasma, albumin, has a molecular weight of 69,000. Calculate the osmotic pressure of a solution of this protein containing 2 g per 100 cm^3 at 25°C in (a) Torr and (b) millimeters of water. The ex-periment is carried out using a salt solution for solvent and a membrane permeable to salt. | [
"(a) 2.79 Torr, (b) 38.0 mm H2O",
"(a) 9.01 Torr, (b) 122.3 mm H2O",
"(a) 7.08 Torr, (b) 69.0 mm H_2O",
"(a) 5.38 Torr, (b) 73.0 mm H_2O"
] | D |
9,425 | The amount of air drag on an 0.8-N flying squirrel dropping vertically at terminal velocity is | [
"dependent on the speed of the wind",
"greater than 0.8 N",
"0.8 N",
"dependent on the temperature of the air"
] | C |
3,872 | A technician is working with dry ice (solid CO_2) in a closed 6000 liter fume hood maintained at a constant pressure of 1.00atmand a constant temperature of 27°C. If he has not been conditioned to tolerate CO_2, he will succumb to CO_2 poisoning when the concen-tration rises to 10%, by volume, of the atmosphere. If the... | [
"1.00 kg",
"1.25 kg",
"800 g",
"1.10 kg"
] | D |
3,627 | The oxidation number of chlorine in the perchlorate ion, ClO4–, is | [
"7",
"2",
"-2",
"5"
] | A |
12,171 | Consider an example of forced convection within a pipe. The local heat transfer coefficient is valid at the point it is evaluated at, and in its immediate vicinity. When the length of pipe as a whole is of concern, the average heat transfer coefficient applies. The average temperature difference is defined as (T_s - T)... | [
"h_av= [{^L\\int_0h_x(T_s - T)dx} / 2\\piR^ L]",
"h_av= [{^L\\int_0h_x(T_s - T)dx} / (T_s -T_av)]",
"h_av= [{^L\\int_0h_xdx} / (T_s - T_av)]",
"h_av= [{^L\\int_0h_x(T_s - T)^2dx} / (T_s - T_av)]"
] | B |
3,763 | Ethanol boils at 78.5°C. If 10 g of sucrose (C_12H_22O_11) is dissolved in 150 g of ethanol, at what temperature will the solution boil? Assume k_b = (1.20°C / M) for the alcohol. | [
"78.5°C",
"79.5°C",
"78.73°C",
"79°C"
] | C |
12,030 | In an experiment to study heat transfer, a metal box 35 in. long, 10 in. wide, and 3 in. deep, is propelled at a velocity of 73.3 ft/sec. The box has a surface tempera-ture of T_s = 145°F while the ambient air temperature is T_\infty = 35°F. Assume a turbulent boundary layer, and employ the same convective heat transfe... | [
"6000 Btu/hr",
"5353 Btu/hr",
"5000 Btu/hr",
"4100 Btu/hr"
] | B |
4,150 | 2 moles of an ideal gas are expanded reversibly and isothermally at 0°C from 1 atm. Calculate the final volume occupied by the gas if the heat absorbed during the pro-cess is 1 = 750 cal. | [
"84.4 liters",
"44.8 liters",
"60 liters",
"50 liters"
] | A |
10,330 | A charged particle moves through a magnetic field and experiences a force f. New particles are sent into the same magnetic field. If the new particles have twice the charge, twice the mass, and twice the velocity, the new force would be | [
"2F",
"Impossible to determine without knowing the direction of the magnetic field",
"4F",
"F/2"
] | C |
3,314 | Fiddler crabs are a dark brown color during the day and change to a pale brown color at night. Is it possible to reverse this pattern and make the crabs turn dark at night and light during the day? How? | [
"The crabs' color change can be influenced by the phase of the moon, reversing the pattern.",
"It is possible to reset the biological clock of the crabs by artificially producing periods of light and darkness or by exposing them to ice water.",
"Crabs can be genetically modified to reverse their day and night c... | B |
12,084 | A two-pole dc generator has an armature containing a total of 40 conductors connected in two parallel paths. The flux per pole is 6.48 × 10^8 lines, and the speed of the prime mover is 30 rpm. The resistance of each conductor is 0.01 ohm, and the current-carrying capacity of each conductor is 10 A. Calculate: (a) The a... | [
"Average generated voltage per path and the generated armature voltage: 110 V, Armature current delivered to an external load: 12 A, Armature resistance: 0.08 Ω, Terminal voltage of the generator: 110.4 V",
"Average generated voltage per path and the generated armature voltage: 130 V, Armature current delivered t... | D |
9,098 | A boat travels directly upstream in a river, moving with constant but unknown speed v with respect to the water. At the start of this trip upstream, a bottle is dropped over the side. After 15 minutes the boat turns around and heads downstream. It catches up with the bottle when the bottle has drifted one mile downstre... | [
"2 miles per hour",
"1 mile per hour",
"2.5 miles per hour",
"3 miles per hour"
] | A |
10,324 | An object is placed 10 cm in front of a diverging mirror. What is the focal length of the mirror if the image appears 2 cm behind the mirror? | [
"-2/5 cm",
"-3/2 cm",
"-2/3 cm",
"-5/2 cm"
] | D |
10,761 | The openSSL implementation described in “Remote Timing Attacks are Practical” (by Brumley and Boneh) uses the following performance optimizations: Chinese Remainder (CR), Montgomery Representation (MR), Karatsuba Multiplication (KM), and Repeated squaring and Sliding windows (RS). Which of the following options would c... | [
"True, True",
"False, False",
"False, True",
"True, False"
] | C |
2,943 | Given the following testcross data for corn in which the genesfor fine stripe (f), bronzealeurone(bz) and knotted leaf(Kn) are involved: Phenotype Number Kn + + 451 Kn f + 134 + + + 97 + fbz 436 Kn +bz 18 + +bz 119 + f + 24 Kn fbz 86 Total 1,365 (a) Determine the sequence of the three genes. (b) Calculate the amount of... | [
"The correct sequence of the three genes is Knfbz or zfbKn, the amount of recombination for Region I is 17%, for Region II is 19%, and the total recombination between f and Kn is 36%, and the coefficient of coincidence (c.c.) is .88",
"The correct sequence of the three genes is bzKnf or fbzKn, the amount of recom... | C |
11,546 | Determine the number of belts required to transmit 70 hp by a 3V large capacity belt of length 100 in., running on pulleys 12 in. in diameter and speed 2000 rpm. The maximum life of the belt, before failure, is 15,000 hrs. | [
"5 belts",
"1 belt",
"10 belts",
"9 belts"
] | A |
4,205 | For the following second-order reversible reaction H_2 + X_2 ^(k)a\rightleftarrows_(k)b 2HX express the thermodynamic equilibrium constant, K, in terms of k_a and k_b. | [
"(k_b / k_a) = K",
"K = k_a + k_b",
"K = (k_b * k_b) / k_a",
"(k_a / k_b) = K"
] | D |
2,986 | If, on average, 46% of the loci in a species' gene pool are heterozygous, then the average homozygosity of the species should be | [
"54%",
"36%",
"76%",
"100%"
] | A |
3,187 | Algae may be microscopic single-celled organisms or enormousmulticellularseaweeds hundreds of feet long. The body of one of these organisms is termed athallus. How does athallusdiffer from a plant body? | [
"A plant body shows differentiation of parts, with its roots, stems, and leaves all varying greatly in structure and in function. Multicellular algae show very little, if any, tissue differentiation.",
"Algae have a more complex structure than plants",
"A thallus has a rigid cell wall made of cellulose, which i... | A |
4,583 | Two possible metabolic fates of \alpha-D-glucose are given below. Compare the standard free energy changes at 25°C for these processes. Which process represents the more efficient utilization of \alpha-D-glucose? (a) \alpha-D-glucose (1 M) \rightarrow 2 ethanol (1 M) + 2CO_2 (g) (b) 6O2(g) + \alpha-D-glucose (1 M) 6CO_... | [
"Neither reaction is efficient",
"Reaction (a)",
"Both reactions are equally efficient",
"Reaction (b)"
] | D |
3,955 | Two separate bulbs contain ideal gases A and B, respectively. The density of gas A is twice that of gas B, and the molecular weight of gas A is half that of gas B; the two gases are at the same temperature. Cal-culate the ratio of the pressure of gas A to that of gas B. | [
"0.75",
"1.5",
"4",
"2.5"
] | C |
10,588 | Consider the following code segment, which uses the variables r, s, and t.
r ← 1
s ← 2
t ← 3
r ← s
s ← t
DISPLAY (r)
DISPLAY (s)
What is displayed as a result of running the code segment? | [
"3 3",
"3 2",
"2 1",
"2 3"
] | D |
10,175 | An ultrasonic transducer used for medical diagnosis oscillates at 6.7 Mhz.How long does each oscillation take, and what is the angular frequency? (Unit: 10^7 rad/s) | [
"5.3",
"1.5",
"4.2",
"8.4"
] | C |
4,115 | What weight of Ca(OH)_2, calcium hydroxide is needed to neutralize 28.0 g ofHCl. What weight of phosphoric acid would this weight of Ca(OH)_2 neutralize? | [
"26 g of Ca(OH)_2, 27 g of H_3PO_4",
"33 g of Ca(OH)_2, 21 g of H_3PO_4",
"28.4 g of Ca(OH)_2, 25.1 g of H_3PO_4",
"25 g of Ca(OH)_2, 30 g of H_3PO_4"
] | C |
11,532 | Find the magnitude of E for a plane wave in free space, if the magnitude of H for this wave is 5 amp/meter. | [
"1200 volts/meter",
"5 ohms",
"1883 volts/meter",
"940.5 volts/meter"
] | C |
2,923 | All of the following organs in the digestive system secrete digestive enzymes EXCEPT the | [
"mouth",
"stomach",
"gall bladder",
"small intestine"
] | C |
9,311 | A voltage will be induced in a wire loop when the magnetic field within that loop | [
"is amplified",
"converts to magnetic energy",
"is parallel to the electric field",
"changes"
] | D |
9,265 | The suspension cable of a 1,000 kg elevator snaps, sending the elevator moving downward through its shaft. The emergency brakes of the elevator stop the elevator shortly before it reaches the bottom of the shaft. If the elevator fell a distance of 100 m starting from rest, the heat that the brakes must dissipate to bri... | [
"500,000 J",
"50,000 J",
"10,000,000 J",
"1,000,000 J"
] | D |
4,003 | Assume all gases are perfect unless stated otherwise. Unless otherwise stated, thermodynamic data are for 298.15 K. A sample of $4.50 \mathrm{~g}$ of methane occupies $12.7 \mathrm{dm}^3$ at $310 \mathrm{~K}$. Calculate the work done when the gas expands isothermally against a constant external pressure of 200 Torr unt... | [
"$-88$$\\mathrm{J}$ ",
"$-110 \\mathrm{J}$",
"$-75$$\\mathrm{J}$",
"$-130 \\mathrm{J}$"
] | A |
2,993 | A piece of potato is dropped into a beaker of pure water. Which of the following describes the activity after the potato is immersed into the water? | [
"Water moves from the surrounding water into the potato.",
"Solutes in the water move into the potato.",
"No movement of water or solutes occurs.",
"Potato cells plasmolyze."
] | A |
12,056 | What is the equilibrium composition of a mixture ofcarbon monoxide, carbon dioxide, and molecular oxygen at 3000°K and30psia? Assume the mixture contains 5 atoms of oxygenper atom of carbon. | [
"x_CO= 0.099, x_(_O)2 = 0.60, x_C_(_O)2 = 0.30",
"x_CO= 0.081, x_(_O)2 = 0.65, x_C_(_O)2 = 0.26",
"x_CO= 0.087, x_(_O)2 = 0.62, x_C_(_O)2 = 0.293",
"x_CO= 0.0891, x_(_O)2 = 0.615, x_C_(_O)2 = 0.296"
] | D |
10,421 | Suppose your model is overfitting. Which of the following is NOT a valid way to try and reduce the overfitting? | [
"Add more noise to the training data.",
"Use the same data for training and testing.",
"Improve the optimisation algorithm being used for error minimisation.",
"Decrease the model complexity."
] | C |
4,256 | At what pressure does the mean free path of argon at $20^{\circ} \mathrm{C}$ become comparable to the diameter of a $100 \mathrm{~cm}^3$ vessel that contains it? Take $\sigma=0.36 \mathrm{~nm}^2$ | [
"0.165 $\\mathrm{Pa}$",
" 0.195 $\\mathrm{Pa}$",
"0.275 $\\mathrm{Pa}$",
"0.235 $\\mathrm{Pa}$"
] | B |
3,826 | Assume all gases are perfect unless stated otherwise. Unless otherwise stated, thermodynamic data are for 298.15 K. When a certain freon used in refrigeration was expanded adiabatically from an initial pressure of $32 \mathrm{~atm}$ and $0^{\circ} \mathrm{C}$ to a final pressure of $1.00 \mathrm{~atm}$, the temperature... | [
"0.65$\\mathrm{K} \\mathrm{atm}^{-1}$",
"1.50$\\mathrm{K} \\mathrm{atm}^{-1}$",
" 0.71$\\mathrm{K} \\mathrm{atm}^{-1}$",
"1.05$\\mathrm{K} \\mathrm{atm}^{-1}$"
] | C |
10,194 | An ophthalmic prescription calls for corrective glasses of - 4.50 m^-1 refractive power to be worn 14mm in front of the cornea, the customary position of spectacle lenses. If the patient chooses to wear contact lenses instead, what prescription would be needed for them? | [
"- 4.23 m^-1",
"- 5.00 m^-1",
"- 4.75 m^-1",
"- 4.10 m^-1"
] | A |
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