question_id int64 | question string | choices list | answer string |
|---|---|---|---|
9,467 | An eyepiece is made of two thin lenses, each of 20 mm focal length, separated by a distance of 16 mm. Find: (a) the equivalent focal length of the eyepiece, (b) the distance of the focal plane from the nearer lens, and (c) the angular magnification provided. | [
"f = + 18.00 mm, i_2 = 2.00 mm, M.P. = 11",
"f = + 16.67 mm, i_2 = 2.33 mm, M.P. = 14",
"f = + 14.50 mm, i_2 = 4.50 mm, M.P. = 18",
"f = + 16.67 mm, i_2 = 3.33 mm, M.P. = 15"
] | D |
12,044 | If the exhaust gases contain 0.22% of NO by weight, calculate (i) The minimum value of \delta allowable if a NO reduction rate of0.032 lb/ft^2hr is to be achieved. (ii) The corresponding minimum allowable value of K. Use the following data. The gases are at: T = 1200°F P = 18.2psia Average molecular wt. of the gases = ... | [
"\\delta = 0.0028 ft, K = 55 lb/ft^2hr",
"\\delta = 0.0040 ft, K = 45 lb/ft^2hr",
"\\delta = 0.0050 ft, K = 60 lb/ft^2hr",
"\\delta = 0.0032 ft, K = 47 lb/ft^2hr"
] | D |
10,441 | What is the output of the statement "a" + "ab" in Python 3? | [
"aaab",
"aab",
"\"a\" + \"ab\"",
"aba"
] | B |
11,557 | Air at 150°F and 20 psig is flowing through a wrought iron pipe at a rate of 900 cfm. Calculate the smallest diameter of the pipe, if the maximum pressure loss in 200 ft. of the air flow is 6 psi. The relative roughness for a wrought iron pipe (\epsilon/D) = 0.0004. | [
"3.30 in",
"4.50 in",
"3.86 in",
"4.75 in"
] | C |
9,731 | When a ball at rest hangs by a single vertical string tension in the string is mg. If the ball is made to move in amhorizontal circle so that the string describes a cone string tension | [
"may be equal to mg depending on the speed of the ball",
"is mg",
"is less than mg when the ball is at the highest point in the circle",
"is greater than mg always"
] | D |
4,645 | Given that ∆H°_CO2(g) = \rule{1em}{1pt} 94.0, ∆H°_CO(g) = \rule{1em}{1pt} 26,4, ∆H°_H2O(l) = 68.4 and ∆H°_H2O(g) = -57.8 Kcal/mole, determine the heats of reaction of (1) CO(g) + (1/2)O_2 (g) \rightarrow CO_2 (g), (2) H_2(g) + (1/2) O_2 (g) \rightarrow H_2O(l) and (3) H_2O(l) \rightarrow H_2O(g). | [
"+10.6 Kcal/mole, -68.4 Kcal/mole, -67.6 Kcal/mole",
"-68.4 Kcal/mole, -67.6 Kcal/mole, +10.6 Kcal/mole",
"-67.6 Kcal/mole, -68.4 Kcal/mole, +10.6 Kcal/mole",
"-94.0 Kcal/mole, -57.8 Kcal/mole, +68.4 Kcal/mole"
] | C |
4,364 | Assume that all gases are perfect and that data refer to 298 K unless otherwise stated. Find an expression for the fugacity coefficient of a gas that obeys the equation of state $p V_{\mathrm{m}}=R T\left(1+B / V_{\mathrm{m}}+C / V_{\mathrm{m}}^2\right)$. Use the resulting expression to estimate the fugacity of argon a... | [
"1.0236$\\text{atm}$",
"1.0567 atm",
"0.9852 atm",
" 0.9974$\\text{atm}$ "
] | D |
10,108 | A spring of force constant k is stretched a certain distance. It takes twice as much work to stretch a second spring by half this distance. The force constant of the second spring is | [
"8k",
"3k",
"k/4",
"k/8"
] | A |
4,400 | Through several successive reactions, a chemist uses carbon,CaO,HCland H_2 O to produce C_6 H_4, Cl_2. Assuming an efficiency of 65 %, how much C_6 H_4 Cl_2 can be produced from 500 grams of carbon? Assume that 1/3 of the carbon is lost as 3 moles CO. | [
"588 grams",
"275 grams",
"442 grams",
"510 grams"
] | C |
9,477 | Why is the sky blue? | [
"Because the Earth's magnetic field causes the sky to appear blue.",
"Because the human eye is more sensitive to blue light.",
"Because the Earth's atmosphere contains a large amount of blue pigment.",
"Because the atmosphere preferentially scatters short wavelengths."
] | D |
9,378 | Determine the equilibrium constant for the dissociation of sodium at $298 \mathrm{~K}: \mathrm{Na}_2(g) \rightleftharpoons 2 \mathrm{Na}(g)$. For $\mathrm{Na}_2$, $B=0.155 \mathrm{~cm}^{-1}, \widetilde{\nu}=159 \mathrm{~cm}^{-1}$, the dissociation energy is $70.4 \mathrm{~kJ} / \mathrm{mol}$, and the ground-state elect... | [
" 2.25 $10^{-9}$",
"1.98 $10^{-9}$",
"5.00 $10^{-8}$",
"4.50 $10^{-9}$"
] | A |
11,638 | 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. | [
"0.9 ft",
"2.0 ft",
"1.8 ft",
"0.7 ft"
] | A |
9,882 | What is the total charge in coulombs of $75.0 \mathrm{~kg}$ of electrons? | [
"$-2.05 \\times 10^{13} \\mathrm{C}$",
" $-1.32$ $10^{13} \\mathrm{C}$",
"$-1.98$ $10^{13} \\mathrm{C}$",
"$-0.98 \\times 10^{13} \\mathrm{C}$"
] | B |
12,198 | Calculate the work done by a perfect gas during an adiabatic frictionlessprocess when its temperature changes from 200°F to 300°F.The molecular weight of the gas is 34.0 and thespecific heat at constant pressure is given by the expressionCp = 0.212 + 0.000059T. | [
"- 19.55 Btu/lb",
"- 25.47 Btu/lb",
"- 30.22 Btu/lb",
"5.67 Btu/lb"
] | A |
9,304 | Spring scales are used to measure the net force applied to an object; a sonic motion detector is used to measure the object’s resulting acceleration. A graph is constructed with the net force on the vertical axis and the acceleration on the horizontal axis. Which of the following quantities is directly measured using t... | [
"Inertial mass",
"Gravitational mass",
"Kinetic energy",
"Velocity"
] | A |
10,461 | Which of the following is not an example of presentation layer issues? | [
"Poor handling of unexpected input can lead to the execution of arbitrary instructions",
"Unintentional or ill-directed use of superficially supplied input",
"Cryptographic flaws in the system may get exploited to evade privacy",
"Weak or non-existent authentication mechanisms"
] | D |
12,164 | The forces experienced by a test charge q for three different velocities at a point in a region characterized by electric and magnetic fields are given by F_1= q[E_0i_x + (E_0 - v_0B_0)i_y]forv_1= v_0i_x F_2= q[(E_0 + v_0B_0)i_x + E_0i_y]forv_2= v_0i_y- F_3= q[E_0i_x + E_0i_y]forv_3= v_0i_z where v_0, E_0, and B_0 are ... | [
"E= E_0 (i_x +i_y), B= B_0i_z",
"E= E_0(i_y - i_x), B= -B_0(i_y + i_z)",
"E= E_0(i_x + 2i_y), B= B_0(i_y - i_z)",
"E= -E_0 (i_x +i_y), B= B_0i_z"
] | A |
10,427 | Which of the following is a remote Trojan? | [
"Troya",
"DaCryptic",
"BankerA",
"Game-Troj"
] | A |
11,540 | A flat piece of plastic, area A = 1 ft^2 and thickness b = 0.252 inch, was tested and found to conduct heat at a rate of 3.0 watts in steady state with temperatures of T_0 = 24°C and T_1 = 26°C on the two main sides of the panel. Find the thermal conductivity of the plastic in cal sec^-1cm^-1 (°K)^-1 at 25°C. | [
"2.47 × 10^-4 cal sec^-1 cm^-1 (°C)^-1",
"2.47 × 10^-4 cal sec^-1 cm^-1 (°K)^-1",
"1.47 × 10^-4 cal sec^-1 cm^-1 (°K)^-1",
"2.47 × 10^-3 cal sec^-1 cm^-1 (°K)^-1"
] | B |
10,482 | The IP protocol is primarily concerned with | [
"Reliable delivery of large (multi-packet) messages between machines that are not necessarily directly connected",
"Providing a user interface for network management",
"Coordinating the hardware components of the network",
"Routing packets through the network"
] | D |
9,148 | Calculate the number of coulombs of positive charge in 250 $\mathrm{cm}^3$ of (neutral) water. (Hint: A hydrogen atom contains one proton; an oxygen atom contains eight protons.) | [
" $1.3$$10^7 \\mathrm{C}$",
"$7.8 \\times 10^6 \\mathrm{C}$",
"$4.5 \\times 10^7 \\mathrm{C}$",
"$6.5 \\times 10^6 \\mathrm{C}$"
] | A |
10,250 | What happens to the force of gravitational attraction between two small objects if the mass of each object is doubled and the distance between their centers is doubled? | [
"It is increased by two times.",
"It remains the same.",
"It becomes zero.",
"It is reduced to half."
] | B |
9,449 | A British warship fires a projectile due south near the Falkland Islands during World War I at latitude $50^{\circ} \mathrm{S}$. If the shells are fired at $37^{\circ}$ elevation with a speed of $800 \mathrm{~m} / \mathrm{s}$, by how much do the shells miss their target and in what direction? Ignore air resistance. | [
"220 m to the north",
"150 m to the east",
" 260 $\\mathrm{~m}$",
"200 $\\mathrm{~m}$"
] | C |
9,764 | Which of the following most likely explains why Venus does not have a strong magnetic field? | [
"It has a weak gravitational field.",
"It has too thick an atmosphere.",
"It does not have a metallic core.",
"Its rotation is too slow."
] | D |
10,424 | Given two Boolean random variables, A and B, where P(A) = 1/2, P(B) = 1/3, and P(A | ¬B) = 1/4, what is P(A | B)? | [
"1/6",
"0",
"1/3",
"1"
] | D |
11,976 | A furnace operates with a gas inlet temperature of 650°C andan outlet temperature of 1,100°C. The inlet gas is composedof 10 percent CO, 20 percent CO_2 and 70 percent N_2 by volume.The combustion occurs with astoichiometric amountof air. Using the following data, determine the maximumflame temperature and the heat sup... | [
"Maximum flame temperature is 1,750°C, Heat supplied to the furnace is 4.5 Btu/ft^3 exhaust gas",
"Maximum flame temperature is 1,601°C, Heat supplied to the furnace is 4.85 Btu/ft^3 exhaust gas",
"Maximum flame temperature is 1,650°C, Heat supplied to the furnace is 5.2 Btu/ft^3 exhaust gas",
"Maximum flame ... | B |
3,284 | The predominant cell type infected by HIV is CD4^+ cells. The mostimportant of these are the T-helper cells. (Review the immunogeneticschapter for a description of T_H-cells.) As the diseaseprogresses through latency into AIDS-related complexand finally full-blown AIDS, the absolute number of CD4^+ cells (i.e., T_H-cel... | [
"T_H-cells are auxiliary cells that enhance the phagocytic function of macrophages without affecting lymphocytes.",
"T_H-cells are necessary for the proper functioning of the specific immune system, that is, for cytotoxic T-cells (T_c) and most B-cells.",
"T_H-cells are necessary for the functioning of only B-c... | B |
9,600 | A spaceship from earth enters a circular orbit 22,000 km above the surface of Mars at the equator, which allows it to rotate at the same speed as Mars and thus to stay always above the same point on the planet's surface. The Martians set up a guided missile directly beneath it and fire it vertically upward in an attemp... | [
"4.8 km/s",
"4.0 km/s",
"3.5 km/s",
"5.2 km/s"
] | A |
4,267 | The relationship introduced in Problem $1-48$ has been interpreted to mean that a particle of mass $m\left(E=m c^2\right)$ can materialize from nothing provided that it returns to nothing within a time $\Delta t \leq h / m c^2$. Particles that last for time $\Delta t$ or more are called real particles; particles that l... | [
"2.0 x 10^-23 s",
" 2.9$10^{-23} \\mathrm{~s}$ ",
"3.0 x 10^-22 s",
"2.5$10^{-23} \\mathrm{~s}$"
] | B |
3,556 | Assume all gases are perfect unless stated otherwise. Unless otherwise stated, thermodynamic data are for 298.15 K. A strip of magnesium of mass $15 \mathrm{~g}$ is placed in a beaker of dilute hydrochloric acid. Calculate the work done by the system as a result of the reaction. The atmospheric pressure is 1.0 atm and ... | [
"$-1.5$$\\text{kJ}$ ",
"$0 \\text{kJ}$ (No work done)",
"$-3.5 \\text{kJ}$",
"$-0.5 \\text{kJ}$"
] | A |
11,758 | A 12 km long pipe carries 0.2m^3/s of water. The pipe diameter is 30 cm; its relative roughness is 0.004. Compute the change in head loss if the temperature of the water changes from 65°C to 30°C. | [
"550.0 m",
"510.0 m",
"400.0 m",
"460.0 m"
] | D |
11,421 | A 4 in. schedule 40 wrought iron pipe is covered with 2 in. thick layer of magnesia insulation (k = 0.041 Btu/hr-ft-°F) and 1(1/4) in. thickness of glass wool (k = 0.032 Btu/hr-ft-°F). If the outer surface of the pipe is at 700°F and the outer surface of the glass wool insulation is at 100°F, determine the rate of heat... | [
"175.9 Btu/(hr)(ft. of pipe)",
"190.3 Btu/(hr)(ft. of pipe)",
"160.2 Btu/(hr)(ft. of pipe)",
"220.8 Btu/(hr)(ft. of pipe)"
] | C |
3,493 | Apoptosis, which is programmed cell death, is a necessary process in living organisms. Which of the following is NOT correct about apoptosis? | [
"It occurs randomly.",
"A particular cell dies when it is no longer needed by the organism.",
"A cell carries out apoptosis when too many mutations have accumulated.",
"Plant cells carry out apoptosis as a defense measure in cells that have been infected by parasites."
] | A |
10,370 | Encapsulating Security Payload (ESP) belongs to which Internet Security Protocol? | [
"Secure File Transfer Protocol",
"Secure IP Protocol",
"Secure Socket Layer Protocol",
"Internet Key Exchange Protocol"
] | B |
10,615 | Write a FORTRAN program segment to compute values of the POISSON distribution given by P(X) = e^-mm^x/x! Assume (1) that X and m are integer variables; (2) that X and m are small enough that no term will exceed the size permitted for a real variable in your computer; and (3) that the function FACT (n) for computing n! ... | [
"FUNCTION P(X,M) INTEGER X Y = FLOAT(M) P = EXP(M) * M ** X / FACT(X) RETURN END",
"FUNCTION P(X,M) INTEGER X, M P = EXP(-M) * M ** X / FACT(X) RETURN END",
"FUNCTION P(X,M) INTEGER X, M P = EXP(-M) / (M ** X * FACT(X)) RETURN END",
"FUNCTION P(X,M) INTEGER X Y = FLOAT (M) P = EXP(-Y) * M ** X / FACT (X) RETU... | D |
11,483 | A low loss transmission line, operating at a frequency of 400MHz, with air as dielectric media, is used for radio transmission. Assuming negligible attenuation and 50\Omega characteristic impedance, calculate: (a) Reflection coefficient \Gamma (b) VSWR and (c) Wavelength of the transmitted signal. | [
"Reflection coefficient = 0.70 at -61.75 degrees, VSWR = 8.0, Wavelength = 0.80 meters",
"Reflection coefficient = 0.80 at -61.75 degrees, VSWR = 9.0, Wavelength = 0.75 meters",
"Reflection coefficient = 0.65 at -61.75 degrees, VSWR = 7.5, Wavelength = 0.78 meters",
"Reflection coefficient = 0.60 at -61.75 de... | B |
9,103 | A solid sphere (I = 0.06 kg·m^2) spins freely around an axis through its center at an angular speed of 20 rad/s. It is desired to bring the sphere to rest by applying a friction force of magnitude 2.0 N to the sphere’s outer surface, a distance of 0.30 m from the sphere’s center. How much time will it take the sphere t... | [
"0.1 s",
"3 s",
"5 s",
"2 s"
] | D |
10,309 | The flywheel of a cutting machine has a mass of 62.5 slugs and a radius of gyration of 3 ft. At the beginning of the cutting stroke it has a rotational speed of 120 rev\bulletmin^-1, and at the end a speed of 90 rev\bulletmin^-1. If it cuts in a 6-in. stroke, what is the average cutting force exerted? | [
"38861.6 lb",
"45000 lb",
"32500 lb",
"27500 lb"
] | A |
9,406 | The spherical shell of a Van de Graaff generator is to be charged to a potential of 10^6 V. Calculate the minimum radius the shell can have if the dielectric strength of air is 3 × 10^6 V\bulletm^-1. | [
"1m",
"1/3m",
"2/3m",
"3/4m"
] | B |
12,091 | A 3.5m × 2m vertical plate is subjected to a constant heat flux of 800 W/m^2. The back of the plate is insulated and the ambient air temperature is 30°C. Determine the average surface temperature of the plate, assuming that all the incident radiation is lost by free convection to the surrounding air. Physical Propertie... | [
"185°C",
"80°C",
"104°C",
"70°C"
] | A |
11,612 | Consider a group of rigid current-carrying circuits, none of which extends to infinity, immersed in a medium with linear magnetic properties. Find the energy of this system in terms of H and B. | [
"U = (1/2) \\int_VH\bulletAdv",
"U = (1/2) \\muH^2 = (1/2) (B^2 / \\mu)",
"U = (1/2) \\int_VH\bulletBdv",
"U = (1/2) \\sum_i\\oint_CiI_iA\bulletdl_i"
] | C |
3,332 | Which of the following is a frameshift mutation? | [
"CAT HAS HIS → CAT HIS HAT",
"CAT HAS HIS → CAT HATH IS",
"CAT HAS HIS → CAT WAS HIT",
"CAT HAS HIS → CAT HSH ISA"
] | D |
3,089 | Define the terms \textquotedblleftrange\textquotedblright and \textquotedblleftcenter of origin.\textquotedblright | [
"Center of origin is the region where a species has the highest rate of reproduction, while the range is the area where it has the lowest survival rate.",
"Range is that portion of earth in which a species is found and center of origin is the place where it originated.",
"Center of origin is the place where a s... | B |
10,268 | A container weighs 3.22 lb force when empty. Filled with water at 60°F the mass of the container and its contents is 1.95 slugs. Find its volume in cubic feet. Assume density of water = 62.4 lb force/ft3. | [
"0.955",
"0.75",
"1.50",
"1.25"
] | A |
9,986 | A crude telescope is constructed of two spectacle lenses of focal lengths 100 cm and 20 cm respectively, a) Find its angular magnification. b) Find the height of the image formed by the objective of a building 200 ft high and one mile distant. | [
"Angular magnification is 5, Image height is 2 inches",
"Angular magnification is 5, Image height is 1.5 inches",
"Angular magnification is 10, Image height is 1.5 inches",
"Angular magnification is 3, Image height is 1 inch"
] | B |
9,818 | A fluid of density ρ flows through a horizontal pipe with negligible viscosity. The flow is streamlined with constant flow rate. The diameter of the pipe at Point 1 is d and the flow speed is V. If the diameter of the pipe at Point 2 is d/3, then the pressure at Point 2 is | [
"more than the pressure at Point 1 by 40 ρv^2",
"less than the pressure at Point 1 by 20 ρv^2",
"more than the pressure at Point 1 by ρv^2",
"less than the pressure at Point 1 by 40 ρv^2"
] | D |
9,588 | A heat pump is to extract heat from an outdoor environment at 7°C and heat the environment indoors to 27°C. For each 15,000 J of heat delivered indoors, the smallest amount of work that must be supplied to the heat pump is approximately | [
"1,500 J",
"1,000 J",
"700 J",
"3,500 J"
] | B |
3,121 | How do cyanobacteria differ from green unicellular algae? | [
"Cyanobacteria reduce sulfur compounds.",
"Cyanobacteria have no nuclei.",
"Green algae cannot reduce nitrogen compounds.",
"Green algae cannot photosynthesize."
] | B |
11,952 | A gas containing NH_3 is flowing in a tube absorber the inside ofwhich is wetted with water at a rate of 5000 Kg/hr. The absorberconsists of 55 tubes and the average temperature (T)is30°C. Each tube is of 60mm I.D. and 5m long. Calculate the mass transfer coefficient \beta for ammonia in the liquidphase. | [
"60.67 Kg/m^2 • hr",
"45.67 Kg/m^2 • hr",
"40.67 Kg/m^2 • hr",
"55.67 Kg/m^2 • hr"
] | D |
11,829 | A three-phase rectifier is supplied by delta-star-connected transformers with an equivalent leakage reactance per Y-leg of 0.25 ohm. The effective voltage from one secondary leg is 100 volts. The load current is 100 amperes. Calculate the drop due to the effect of overlap on the wave shape, and also the angle of overla... | [
"Drop = 11.9 volts, Angle of overlap = 37°21'",
"Drop = 11.0 volts, Angle of overlap = 38°00'",
"Drop = 11.5 volts, Angle of overlap = 37°45'",
"Drop = 10.2 volts, Angle of overlap = 36°45'"
] | A |
12,236 | A signal source operating at 50MHz has an output impedance of 20 ohms. It is to supply power through a coaxial line to a load impedance of 150 + j40 ohms. Is it possible to design a quarter-wave transformer to match the source to the load? | [
"A quarter-wave transformer with a characteristic impedance of 100 ohms can match the source to the load",
"The matching transformer would need a characteristic impedance = √[(20)(150)] = 54.77 ohms",
"The matching transformer would have a characteristic impedance = \\surd[(50)(150)] = 86.60 ohms",
"A quarter... | D |
4,089 | A PO3- radical produces a pair of lines separated by 280 MHz with giso = 2.005. Calculate the expected resonant field positions of both lines in the X-band EPR spectrum (ν = 9.5 GHz). | [
"Bres for mI = -½ = 325.0 mT; Bres for mI = +½ = 335.0 mT",
"Bres for mI = -½ = 400.0 mT; Bres for mI = +½ = 410.0 mT",
"Bres for mI = -½ = 0.218 mT; Bres for mI = +½ = 0.418 mT.",
"Bres for mI = -½ = 333.5 mT; Bres for mI = +½ = 343.5 mT."
] | C |
3,335 | A marine ecosystem region characterized by penetrance of solar radiation and upwelling of nutrients is the | [
"limnetic zone",
"euphotic zone",
"pelagic zone",
"neritic zone"
] | D |
9,455 | A uniformly charged conducting sphere of $1.2 \mathrm{~m}$ diameter has surface charge density $8.1 \mu \mathrm{C} / \mathrm{m}^2$. Find the net charge on the sphere. | [
"$97 \\mu \\mathrm{C}$",
" $37$$\\mu \\mathrm{C}$ ",
"$77 \\mu \\mathrm{C}$",
"$87 \\mu \\mathrm{C}$"
] | B |
3,067 | Why is the organism that causes smallpox not used in the vaccine against smallpox? | [
"The organism is extinct in the wild and cannot be harvested for vaccine production",
"The organism that causes smallpox is too costly to use in vaccine production",
"The use of the actual virulent variola virus may be dangerous if too much is administered",
"Smallpox virus is confined to research laboratorie... | C |
3,475 | What is the difference between a kinesis and a taxis? | [
"Kinesis and taxis are different types of animal migration.",
"A kinesis is an undirected type of orientation, while a taxis is a directed type of orientation.",
"Kinesis is a social behavior among animals, whereas taxis is a solitary response to environmental cues.",
"Taxis involves a change in speed of move... | B |
10,063 | Polarization is a property of | [
"transverse waves.",
"Mechanical waves in solids.",
"Light waves in a vacuum.",
"Gravitational waves."
] | A |
3,282 | Both Mr. and Mrs. Brown suffer from anautosomalrecessive condition that makes them anemic. Mr. Brown has one amino acid substitution in the \beta-chain of his hemoglobin molecules and Mrs. Brown has a similar defect in her \alpha-chain. Neither Betsy norBoopsy, their children, are anemic. Explain. | [
"Only one parent can pass the disorder to the children",
"Both parents will definitely pass the disorder to their children",
"Both children inherited a different form of anemia that is not detectable at their current age.",
"Both parents have a homozygous trait but may or may not pass the disorder to their ch... | D |
11,616 | Laminar film condensation of super-saturated steam occurs on a vertical surface. The steam is at a pressure of 1.43 psi and a saturation temperature of 114°F. If the wall temperature is 105°F, what is the coefficient of heat transfer at a point 3 in. from the top? | [
"1,486 Btu/hr-ft^2-°F",
"1,071.6 Btu/hr-ft^2-°F",
"1,567 Btu/hr-ft^2-°F",
"0.3656 Btu/hr-ft^2-°F"
] | C |
9,987 | The wavelengths of the sodium D lines are 589.593 m\mu and 588.996 m\mu. (a) What is the order minimum number of lines a grating must have in order to resolve these lines in the first order spectrum? (b) How large a prism is needed to resolve these lines, if the Rate of change of index with wavelength, at a wavelength ... | [
"987 lines, 1.87 cm",
"986 lines, 1.86 cm",
"990 lines, 1.90 cm",
"989 lines, 1.89 cm"
] | A |
12,080 | A four-pole d-c generator has an armature winding containing a total of 648 conductors connected in two parallel paths. If the flux per pole is 0.321 × 10^6 maxwells and the speed of rotation of the armature is 1,800 rpm, (a) calculate the average generated voltage, (b) calculate the rated current in each conductor (pe... | [
"(a) 110 volts, (b) 27 amp",
"(a) 125 volts, (b) 20 amp",
"(a) 100 volts, (b) 15 amp",
"(a) 130 volts, (b) 22 amp"
] | B |
10,487 | Statement 1| The set of all rectangles in the 2D plane (which includes non axisaligned rectangles) can shatter a set of 5 points. Statement 2| The VC-dimension of k-Nearest Neighbour classifier when k = 1 is infinite. | [
"True, True",
"False, True",
"Depends on the dataset, True",
"False, Depends on the dataset"
] | A |
10,518 | Which of the following statements describe(s) properties of a purely segmented memory system?
I. It divides memory into units of equal size.
II. It permits implementation of virtual memory.
III. It suffers from internal fragmentation. | [
"I only",
"II only",
"III only",
"I and III"
] | B |
4,301 | At 395 K, chlorine and carbon monoxide react to form phosgene, COCI_2 , according to the equation CO (g) + Cl_2 (g) \rightleftarrows COCI_2 (g). The equilibrium partial pressures are PCI_2 = 0.128atm, P_CO = 0.116atm, and P(COCl)2= 0.334atm. Determine the equilibrium constantK_pfor the dissociation of phosgene and the ... | [
"0.0444 atm, 0.206",
"0.0944 atm, 0.256",
"0.0844 atm, 0.246",
"0.0044 atm, 0.166"
] | A |
3,435 | Which of the following about meiosis is NOT true? | [
"Meiosis produces two haploid gametes.",
"Homologous chromosomes join during synapsis.",
"Sister chromatids separate during meiosis I.",
"Crossing-over increases genetic variation in gametes."
] | C |
9,766 | Protons used in cancer therapy are typically accelerated to about 0.6c. How much work must be done on a particle of mass m in order for it to reach this speed, assuming it starts at rest? | [
"1.75mc^2",
"0.25mc^2",
"0.67mc^2",
"0.60mc^2"
] | B |
11,456 | Air flowing through a nozzle encounters a shock. The Mach number upstream of the shock isM_x= 1.8, and the static temperature downstream of the shock is T_y = 800°R. How much has the velocity changed across the shock ? Assume \gamma = 1.4. | [
"1300 ft/sec",
"1230 ft/sec",
"950 ft/sec",
"1160 ft/sec"
] | D |
11,614 | Determine the average surface conductance per unit length ofa long rod, 0.33 in. diameter, exposed to hot air blast at 110°F.The temperature of the rod has increased from 50°F to70°F in 60 seconds. Assume the thermal conductivity for rodmaterial as k = 300 Btu/hr.ft.°F, \rho = 600lbm/ft^3, and Cp = 0.18 Btu/lbm.°F. | [
"18.06 Btu/hr. ft^2.°F",
"16.06 Btu/hr. ft^2.°F",
"22.06 Btu/hr. ft^2.°F",
"20.06 Btu/hr. ft^2.°F"
] | A |
3,586 | What volume (in cc) is occupied by a block of woodof dimensions25.0 m × 10.0 cm × 300 mm. All edges are 90° toone another. | [
"7.50 × 10^5 cc",
"75000 cc",
"3.75 × 10^5 cc",
"750 cc"
] | A |
3,386 | Which of the following is the source of oxygen produced during photosynthesis? | [
"O2",
"CH4 (Methane)",
"CO2",
"H2O"
] | D |
11,894 | Find the throat area, exit area and the exit Mach number for a nozzle having an efficiency of 90%. The initial air pressure and temperature are 60 psia and 1500°R respectively. The air mass flow rate is 0.6 lb/sec and the exit pressure is 14.696 psia. | [
"Throat area: 0.0055 ft^2, Exit area: 0.0070 ft^2, Exit Mach number: 1.50",
"Throat area: 0.0070 ft^2, Exit area: 0.0080 ft^2, Exit Mach number: 1.25",
"Throat area: 0.0048 ft^2, Exit area: 0.0065 ft^2, Exit Mach number: 1.55",
"Throat area: 0.0051 ft^2, Exit area: 0.0068 ft^2, Exit Mach number: 1.45"
] | D |
12,060 | A mixture of 6 mol of helium and 4 mol of nitrogen is at 170°F and 120psia. If this mixture is expanded isentropic-ally to 25psia, find (a) the final temperature of the mixture, and (b) the entropy change for each constituent gas. Assume all gases are ideal. | [
"Final temperature of the mixture is 366.8°R, the entropy change for helium is 2.578 Btu/°R and for nitrogen is -2.578 Btu/°R",
"Final temperature of the mixture is 500°R, the entropy change for helium is 2.578 Btu/°R and for nitrogen is -2.578 Btu/°R",
"Final temperature of the mixture is 366.8°R, the entropy ... | A |
3,721 | A proposed mechanism for a reaction is as follows: NO2 + F2 →NO2F + F Slow step. F + NO2 → NO2F Fast step. What is the order of the overall reaction? | [
"Fourth order",
"Second order",
"First order",
"Zero order"
] | B |
9,486 | Two charged particles are fixed to an $x$ axis: Particle 1 of charge $q_1=2.1 \times 10^{-8} \mathrm{C}$ is at position $x=20 \mathrm{~cm}$ and particle 2 of charge $q_2=-4.00 q_1$ is at position $x=70 \mathrm{~cm}$. At what coordinate on the axis (other than at infinity) is the net electric field produced by the two p... | [
"$10$ $\\mathrm{~cm}$",
"$80$ $\\mathrm{~cm}$",
" $-30$ $\\mathrm{~cm}$",
"$-50$ $\\mathrm{~cm}$"
] | C |
9,228 | In 1985 the space shuttle Challenger flew a cesium clock and compared its time with a fixed clock left on Earth. The shuttle orbited at approximately 330 km above Earth with a speed of 7712 m/s. Calculate the expected time lost per second (in picoseconds) for the moving clock and compare with the measured result of $-2... | [
"275.98",
"160.34",
"220.45",
"330.76"
] | D |
4,101 | Assume all gases are perfect unless stated otherwise. Unless otherwise stated, thermodynamic data are for 298.15 K. When $120 \mathrm{mg}$ of naphthalene, $\mathrm{C}_{10} \mathrm{H}_8(\mathrm{~s})$, was burned in a bomb calorimeter the temperature rose by $3.05 \mathrm{~K}$. By how much will the temperature rise when ... | [
"50.0$\\text{K}$",
"150$\\text{K}$",
"75.0$\\text{K}$",
" 205$\\text{K}$ "
] | D |
3,900 | Calculate the standard potential of the $\mathrm{Ce}^{4+} / \mathrm{Ce}$ couple from the values for the $\mathrm{Ce}^{3+} / \mathrm{Ce}$ and $\mathrm{Ce}^{4+} / \mathrm{Ce}^{3+}$ couples.
| [
"-1.83 $\\mathrm{V}$",
"-1.72 $\\mathrm{V}$",
" -1.46 $\\mathrm{V}$",
"-1.56 $\\mathrm{V}$"
] | C |
12,228 | A test charge q C, moving with a velocityv= (i_x +i_y) m/sec, experiences no force in a region of electric and magnetic fields. If the magnetic flux density B= (i_x - 2i_z)Wb/m^2, findE. | [
"(i_z - 2i_y) volts/m",
"(-i_x + i_y) volts/m",
"(3i_x - i_y - 2i_z) volts/m",
"(2ix - 2i_y +i_z) volts/m"
] | D |
3,425 | Suppose you discovered a new species of bioluminescent worm . How could you prove that it was the worm itself and not some contaminating bacteria that was producing the light ? | [
"Isolate the light-producing organ and test it in isolation from the worm",
"Use spectroscopy to analyze the light's wavelength signature and compare it to known bioluminescent organisms",
"Place the light-producing substance in complete growth media or physically examine the light-emitting substance under a mi... | C |
9,928 | Traveling at an initial speed of 1.5 × 10^6 m/s, a proton enters a region of constant magnetic field, B, of magnitude 1.0 T. If the proton's initial velocity vector makes an angle of 30° with the direction of B, compute the proton's speed 4 s after entering the magnetic field. | [
"1.5 × 10^6 m/s",
"5.0 × 10^5 m/s",
"2.0 × 10^6 m/s",
"2.5 × 10^5 m/s"
] | A |
4,033 | Calculate ∆H for the reaction at 25°C. CO(g) + (1/2)O_2 (g) \rightarrow CO_2 (g)∆E = - 67.4Kcal. | [
"- 0.3 Kcal",
"0 Kcal",
"- 67.7 Kcal",
"67.7 Kcal"
] | C |
10,066 | An object of height 5cm is placed 10 cm in front of a convex mirror that has a radius of curvature of 45.0 cm. Determine the magnification of the image. | [
"0.8",
"1.5",
"3.0",
"1.8"
] | D |
10,313 | According to the free electron gas theory the average kinetic energy, E, of the free electrons in a metal has been shown to be (3/5)E_F where E_F is the Fermi energy of the metal. Use this information to estimate the average speed of the valence electrons in copper. (The Fermi energy of copper is 7eV). | [
"3.0 × 10^5 m/s",
"1.21 × 10^6 m/s",
"8.5eV",
"5.8 × 10^-19 J"
] | B |
2,929 | A feature of amino acids NOT found in carbohydrates is the presence of | [
"carbon atoms",
"oxygen atoms",
"nitrogen atoms",
"hydrogen atoms"
] | C |
4,135 | Determine the quantity of heat required to convert 10 g of ice at 0°C to vapor at 100°C, For water, heat of fusion = 80 cal/g, heat of vaporization = 540 cal/g, and specific heat = 1 cal/g -°C. | [
"800 calories",
"10800 calories",
"7200 calories",
"8500 calories"
] | C |
3,375 | The dorsal root of a nerve leading to the leg of a rat is severed. How will this affect the rat? How would the effect vary if the ventral root were severed instead? | [
"Severing the ventral root results in loss of motor function, but sensation remains intact.",
"Severing the dorsal root causes hyperactivity in movement, while severing the ventral root leads to increased sensation.",
"Severing the dorsal root will lead to loss of sensation and reflex action, but if the ventral... | C |
3,391 | Which of the following statements about embryonic cleavage is NOT true? | [
"The presence of yolk inhibits cleavage.",
"Telolecithal eggs undergo meroblastic cleavage.",
"The vegetal pole undergoes cleavage more readily than does the animal pole",
"The rapid mitotic divisions of cleavage directly give rise to blastomeres."
] | C |
11,287 | The errors mainly caused by human mistakes are | [
"gross error.",
"instrumental error.",
"systematic error."
] | A |
11,508 | 0.14 moles H_2/mole fuel 0.27 moles CO/mole fuel 0.03 moles CH_4/mole fuel 0.006 moles O_2/mole fuel 0.509 moles N_2/mole fuel 0.045 moles CO_2/mole fuel Determine the air-fuel ratio if producer gas from this sample isburned with 50 percent excess air. | [
"2.17lbmair/lbmfuel",
"1.233lbmair/lbmfuel",
"2.5 lbm air/lbm fuel",
"1.95 lbm air/lbm fuel"
] | A |
11,527 | The flux-distribution curve of a synchronous machine is representedat no-load by B_x= 100 sin (x/\tau) \pi - 14 sin 3 (x/\tau) \pi - 20 sin 5 (x/\tau) \pi + 1 sin 7 (x/\tau) \pi. Determine theemfsinduced at no-load by the harmonics (asfractions of the fundamental). | [
"(E_3 / E_1) = 0.1, (E_5 / E_1) = 0.02, (E_7 / E_1) = 0.004",
"(E_3 / E_1) = 0.00072, (E_5 / E_1) = 0.01435, (E_7 / E_1) = 0.075",
"(E_3 / E_1) = 0.075, (E_5 / E_1) = 0.01435, (E_7 / E_1) = 0.00072",
"(E_3 / E_1) = 0.05, (E_5 / E_1) = 0.01, (E_7 / E_1) = 0.002"
] | C |
3,639 | Nelson, et al. (Science 238, 1670 (1987)) examined several weakly bound gas-phase complexes of ammonia in search of examples in which the $\mathrm{H}$ atoms in $\mathrm{NH}_3$ formed hydrogen bonds, but found none. For example, they found that the complex of $\mathrm{NH}_3$ and $\mathrm{CO}_2$ has the carbon atom neare... | [
"0.150",
" 0.123",
"0.135",
"0.098"
] | B |
3,514 | Briefly discuss some abnormalities of the respiratory tract. | [
"Migraines, epilepsy, and multiple sclerosis",
"Gastroesophageal reflux disease (GERD), irritable bowel syndrome (IBS), and peptic ulcers",
"Diabetes, hypertension, and stroke",
"Tuberculosis, infections, allergic reactions such as hay fever and allergic asthma, lung cancer, emphysema, and respiratory distres... | D |
9,170 | A gas cell with an optical path length of 10 cm is placed in one arm of a Michelson interferometer. If the light source for the interferometer is a laser with wavelength 632.2 nm, then 100 fringes are counted as the gas cell is evacuated. What is the index of refraction of the original gas? | [
"1.00032",
"1.00063",
"1.00047",
"1.00052"
] | A |
4,584 | Calculate the energy of a hydrogen atom in its ground state (n = 1) using the mass of the electron rather than the reduced mass of the hydrogen atom. | [
"- 13.61eV",
"1.6022 × 10^-19C",
"- 2.1802 × 10^-18 J",
"9.1095 × 10^-31kg"
] | A |
3,770 | Calculate the heat absorbed, \DeltaH, at constant pressure when one mole of N_2(g) is heated from 25°C or 298°K to 150°C or 423°K. The heat capacity at constant pressure is C_P = 6.76 + .606 × 10^-3T + 1.3 × 10^-7T^2 cal K^-1mol^-1 | [
"874.44J mol^-1",
"500J mol^-1",
"3658.6J mol^-1",
"4100J mol^-1"
] | C |
9,713 | When two tuning forks are sounded simultaneously, a beat note of 5 cycles per second is heard. If one of the forks has a known frequency of 256 cycles per second, and if a small piece of adhesive tape fastened to this fork reduces the beat note to 3 cycles per second, what is the frequency of the other fork? | [
"255",
"248",
"262",
"251"
] | D |
4,388 | Chromic oxide (Cr_2 O_3) may be reduced with hydrogen according to the equation Cr_2 O_3 + 3H_2 \rightarrow 2Cr + 3H_2 O (a) What weight of hydrogen would be required to reduce 7.6 g of Cr_2 O_3? (b) For each mole of metallic chromium prepared, how many moles of hydrogen will be required? (c) What weight of metallic ch... | [
"0.50 g, 2.5 moles, 1500 lbs",
"0.60 g, 3.0 moles, 1600 lbs",
"0.30 g, 1.5 moles, 1333 lbs",
"0.45 g, 2.25 moles, 1550 lbs"
] | C |
4,144 | What would be the surface tension of a liquid (density 0.876 g / cm^3) which rises 2.0 cm in a capillary where water at 20°C rises 4.5 cm? | [
"28.27 dyn / cm",
"72.62 dyn / cm",
"36.31 dyn / cm",
"9.06 dyn / cm"
] | A |
2,856 | Two related species evolve in a way that makes them less similar. | [
"Coevolution",
"Punctuated equilibrium",
"Directional selection",
"Divergent evolution"
] | D |
3,582 | Find K_b andpK_bfor the acetate ion CH_3COO^-, The ionization constant of CH_3COOH is K_a = 1.75 × 10^-5;K_w= 1.00 × 10^-14. | [
"K_b = 5.71 × 10^-9, pK_b = 8.244",
"K_b = 5.71 × 10^-10, pK_b = 9.244",
"K_b = 5.71 × 10^-11, pK_b = 10.244",
"K_b = 9.244, pK_b = 5.71 × 10^-10"
] | B |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.