question_id int64 | question string | choices list | answer string |
|---|---|---|---|
11,333 | Find f_1(t) {_\ast} f_2(t) if f_1(t) = 2e^-4tu(t) and f_2(t) = 5 cos 3t u(t). | [
"f_1(t) {_\u0007st} f_2(t) = (1.6 cos 3t + 1.2 sin 3t - 1.6e^-4t)u(t)",
"f_1(t) {_\u0007st} f_2(t) = (1.2 cos 3t + 1.6 sin 3t - 1.3e^-4t)u(t)",
"f_1(t) {_\u0007st} f_2(t) = (1.4 cos 3t + 1.2 sin 3t - 1.5e^-4t)u(t)",
"f_1(t) {_\u0007st} f_2(t) = (1.6 cos 3t + 1.0 sin 3t - 1.6e^-4t)u(t)"
] | A |
9,694 | A boy leaning over a railway bridge 49 ft high sees a train approaching with uniform speed and attempts to drop a stone down the funnel. He releases the stone when the engine is 80 ft away from the bridge and sees the stone hit the ground 3 ft in front of the engine. What is the speed of the train? | [
"55 mph",
"20 mph",
"30 mph",
"60 mph"
] | C |
3,265 | Short sequence by promoter that assists transcription by interacting with regulatory proteins. | [
"Promoter",
"Inducer",
"Repressor",
"Operator"
] | D |
2,900 | The cells of humans and most animals have become adapted to surviving only within a relatively small range of hydrogen ion concentrations. What is the role of the kidneys in regulating hydrogen ion concentration? | [
"The kidneys filter out hydrogen ions and recycle them into other cellular processes.",
"The kidneys regulate the hydrogen ion concentration of the extracellular fluids by excreting either acidic or basic constituents when the levels deviate from normal.",
"The kidneys maintain a constant production of hydrogen... | B |
4,572 | At 25°C, sucrose and water form an ideal solution and the solu-bility of sucrose in the water is 6.2molal. Calculate the heat of fusion of sucrose given that its molecular weight is 342, melting point is 200°C and the heat of fusion of water is 1400 cal/mole. | [
"3650 cal = 3.65 kcal",
"3750 cal = 3.75 kcal",
"4000 cal = 4.0 kcal",
"4100 cal = 4.1 kcal"
] | A |
3,934 | Glucose-1-phosphate, essential to the metabolism of carbohydrates in humans, has a molecular weight of 260 g/mole and a density of about 1.5 g/cm^3. What is the volume occupied by one molecule of glucose-1-phosphate? | [
"2.9 × 10^-22 cm^3",
"8.2 × 10^-22 cm^3",
"1.5 × 10^-22 cm^3",
"1.0 × 10^-21 cm^3"
] | A |
10,529 | What are support vectors? | [
"The data outliers in an SVM.",
"The data points that are used to calculate the distance in an SVM.",
"The only examples necessary to compute f(x) in an SVM.",
"The data centroid."
] | C |
10,574 | Consider Convolutional Neural Network D2 which takes input images of size 32x32 with 1 colour channels. The first layer of D2 uses 4 filters of size 5x5, a stride of 2, and zero-padding of width 1. The dimensions of the resulting activation map for each filter in this first layer will be k x k. What is the value of k? | [
"25",
"14",
"20",
"15"
] | D |
12,182 | Let X be the random variable denoting the result of the single toss of a fair coin. If the toss is heads, X = 1. If the toss results in tails, X = 0. What is the probability distribution of X? | [
"f(0) = (0) and f(1) = (1)",
"f(0) = (1/2) and f(1) = (1/2)",
"f(0) = (1) and f(1) = (0)",
"f(0) = (1/6) and f(1) = (5/6)"
] | B |
10,392 | Which of the following is a clustering algorithm in machine learning? | [
"Linear Regression",
"CART",
"Logistic Regression",
"Expectation Maximization"
] | D |
3,036 | Why would one call a flock of birds a \textquotedblleftsociety\textquotedblright? | [
"Birds are called a society because each bird takes a turn leading the flock.",
"Birds in a flock are unrelated",
"A flock of birds can be considered an elementary form of society called a motion group.",
"The collective intelligence of a flock is referred to as a society."
] | C |
10,333 | When red and blue light are overlapped, the color produced is | [
"cyan",
"pink",
"magenta",
"brown"
] | C |
9,218 | Consider a ball rolling in a horizontal circular path on the inside surface of a cone. The normal force on the ball | [
"may be greater or less than mg",
"is less than mg always",
"is greater than mg always",
"is dependent on the radius of the circular path"
] | C |
4,064 | It has been suggested that a 10° rise in temperature results in a twofold response in the rate of a chemical reaction. What is the implied activation energy at 27°C? ; at 1000°C? | [
"16.4 k cal / mole and 240 k cal/mole",
"14.9 k cal / mole and 230 k cal/mole",
"17.0 k cal / mole and 245 k cal/mole",
"12.8 k cal / mole and 226 k cal/mole"
] | D |
10,350 | A certain type of glass has an absorption coefficient of \alpha = 0.05 mm^-1. What percentage of light is transmitted through a plate 4 mm thick? | [
"90.12%",
"81.87%",
"78.32%",
"65.97%"
] | B |
4,576 | How many calories of heat must be added to 3.0 liters of water to raise the temperature of the water from 20°C to 80°C? | [
"360 Kcal",
"420 Kcal",
"90 Kcal",
"180 Kcal"
] | D |
3,361 | Discuss how the quantitative measurements of the dioxy-ribonucleic acid content of cells is evidence that DNA is the genetic material. | [
"The increase in DNA content following cell division indicates that DNA is the genetic material.",
"The presence of DNA in mitochondria and chloroplasts, but not in the cell nucleus, is evidence that DNA is the genetic material.",
"The constant amount of DNA in all body cells and half the amount in germ cells i... | C |
2,832 | A group of students were invited to taste phenylthiocarbamide (PTC). The ability to taste PTC is inherited by a single pair of genes and tasting (T) is dominant to non-tasting (t). Among 798 students, 60.4 percent were tasters, a) Calculate the allelic frequency of T and t. b) How many of the students were TT? Tt? tt? | [
"Frequency of T is .371, Frequency of t is .629, Number of students with TT is 109, Tt is 373, tt is 316",
"Frequency of T is .396, Frequency of t is .604, Number of students with TT is 150, Tt is 348, tt is 300",
"Frequency of T is .533, Frequency of t is .467, Number of students with TT is 200, Tt is 398, tt ... | A |
3,513 | What properties of water make it an essential component of living matter? | [
"Water is abundant, a good solvent, regulates heat, serves as a lubricant, aids in transport of nutrients, and maintains osmotic relationships.",
"Water is detrimental to the regulation of heat in the body.",
"Water is a poor solvent, making it unsuitable for chemical reactions in cells.",
"Water provides no ... | A |
4,153 | If one increases the angle away from the Z axis, how does the wave function for a 2P_Z electron change? | [
"The wave function increases.",
"The wave function inverts in phase.",
"The wave function and the electron density for a 2P_Z electron decreases.",
"The wave function becomes constant throughout all angles."
] | C |
3,663 | Calculate ∆m, the difference in mass between the final and initial nuclei in grams per mole for the emission of a \gamma ray, ^19_8O\textasteriskcentered (excited state)\rightarrow^19_8O (ground state) + \gamma (∆E = 1.06 × 10^8 Kcal/mole). | [
"6.92 × 10^-3 g/mole",
"- 4.92 × 10^-3 g/mole",
"4.92 × 10^-3 g/mole",
"- 7.92 × 10^-3 g/mole"
] | B |
10,159 | The charge on an oil drop is measured in the laboratory. Which of the following measurements should be rejected as highly unlikely to be correct? | [
"2.4 × 10^-19 C",
"6.4 × 10^-19 C",
"8.0 × 10^-19 C",
"4.8 × 10^-19 C"
] | A |
3,195 | During the courtship of the common tern, the male presents afish to another tern. Account for this behavior and discuss whycourtship in general may benecesaryfor reproduction. | [
"Courtship behavior serves for sexual identification, decreases aggressive tendencies for mating, necessary for egg production in some animals and for species identification.",
"Courtship behavior is a form of combat",
"Courtship behavior is used by terns to teach their young how to fish before they are born.",... | A |
9,091 | A man stands at the center of a turntable, holding his arms extended horizontally with a 10-lb weight in each hand. He is set rotating about a vertical axis with an angular velocity of one revolution in 2 sec. Find his new angular velocity if he drops his hands to his sides. The moment of inertia of the man may be assu... | [
"2.13 pi rad/sec",
"1.2 pi rad/sec",
"4 pi rad/sec",
"2.67 pi rad/sec"
] | A |
2,851 | Occasionally a boy is born withundescendedtestes (cryptorchidism), and he will be sterile unless they are surgically caused to descend into the scrotum. Explain the reason for this. | [
"Human sperm cannot develop at the high temperature found within the body cavity.",
"The testes require the lower pressure environment of the scrotum for sperm maturation",
"Testes must be in the scrotum to properly attach to the vas deferens",
"The scrotum provides the necessary nutrients for sperm developme... | A |
4,245 | The name for CH3CHBrCHClCH2CH3 is | [
"2-bromo, 3-chloropropane",
"2-bromo, 3-chloropentane",
"2,3-dibromochloropentane",
"trichlorodibromopentane"
] | B |
11,929 | Evaluatedivuat the point (- 1, 1, 2) foru= x^2i+e^xyj+ xyzk(1) | [
"- 3 - e^1",
"- 2 - e^-1",
"2 + e^-1",
"- 3 - e^-1"
] | D |
10,627 | As of 2020, which architecture is best for classifying high-resolution images? | [
"graph networks",
"Autoencoders",
"convolutional networks",
"fully connected networks"
] | C |
9,814 | A whiffle ball is tossed straight up, reaches a highest point, and falls back down. Air resistance is not negligible. Which of the following statements are true?
I. The ball’s speed is zero at the highest point.
II. The ball’s acceleration is zero at the highest point.
III. The ball takes a longer time to travel up to ... | [
"I & III only",
"None of the above",
"I, II & III",
"I & II only"
] | D |
10,674 | Consider $x(t)$ to be given as, $$ x(t)=10 \cos (20 \pi-\pi / 4)-5 \cos (50 \pi t) $$ What is minimum sampling rate (/Hz) such that $y(t)=x(t)$ ? | [
"30",
"20",
"40",
"50"
] | D |
9,066 | A newly discovered planet has twice the density of the earth, but the acceleration due to gravity on its surface is exactly the same as on the surface of the earth. What is its radius? | [
"2.84 × 10^6 meters",
"3.19 × 10^6 meters",
"5.12 × 10^6 meters",
"9.00 × 10^6 meters"
] | B |
10,086 | A lens is used to project the image of a lantern slide on a screen located 160 ft from the projector. In this position the image on the screen is 100 times larger than the slide. If the screen is moved 100 inches closer, how far must the lantern slide be moved (relative to the lens) to keep the image on the screen in s... | [
"0.01 inches",
"0.25 inches",
"1.00 inch",
"0.02 inches"
] | A |
11,342 | A wet bulb thermometer is showing15.55°C when dry airat atmosphericpressure is blowing across the thermometer. Estimate the dry air temperature. | [
"15.55°C",
"55.85°C",
"18.00°C",
"45.75°C"
] | D |
12,052 | If holding current of a thyristor is 2 mA then latching current should be | [
"0.001 A.",
"0.004 A.",
"0.01 A.",
"0.002 A."
] | B |
4,058 | One of the two most common ingredients in medication designed for the relief of excess stomach acidity is aluminum hydroxide (Al (OH)_3, formula weight = 78 g/mole). If a patient suffering from a duodenal ulcer displays a hydrochloric acid (HCI, formula weight = 36.5 g/mole), concentration of 80 × 10^-3 M in his gastri... | [
"240 ml",
"750 ml",
"120 ml",
"420 ml"
] | A |
12,139 | An equation of state due toDietericiis P(V -nb')exp [na' / (RTV)] =nRT(1) Evaluate the constants a' and b' in terms of the critical constants P_c,V_c, andT_cof a gas. | [
"a' = 2RT_cV_c, b' = (2*V_c)",
"a' = P_cV_c^2, b' = V_c / 3",
"a' = RT_c^2 / P_c, b' = V_c / P_c",
"a' = 2RT_cV_c, b' = (V_c/ 2)"
] | D |
4,340 | A first-order reaction has a half-life of 34 minutes. What is the rate constant for this reaction? | [
"34 s-1",
"34 min",
"3.4 × 10^-4 s-1",
"2.9 × 10^-1 min-1"
] | C |
9,341 | A lens is required to form a virtual image with a magnification of 5 at a distance of 25 cm from the lens. If the glass selected for its construction has a refractive index of 1.60 for the frequency of the light to be used, and one surface is to be plane, what must be the radius of curvature of the other surface of the... | [
"5.5 cm",
"4 cm",
"2.5 cm",
"3.75 cm"
] | D |
3,228 | The frequency ofTay-Sachs disease in the Jewish population of New York City is about 0.015 and approximately 0.0015 in non-Jewish individuals. Homozygotesdie in infancy or early childhood. If the selection coefficient is 1 and the forward mutation rate is 1 × 10^-6, what is the equilibrium frequency of theTay-Sachs gen... | [
"0.02",
"0.001",
"1 × 10^-6",
"0.005"
] | B |
11,827 | The pressure and Mach number of helium flowing through a channelat a certain point are found to be P = 30psiaand M = 1.5. At a point further downstream the pressure is 15psia.Assuming isentropic flow through the channel, determinethe Mach number at the second point. Assume \gamma = 1.67. One-Dimensional Isentropic Comp... | [
"2.80",
"1.65",
"0.75",
"1.98"
] | D |
9,372 | Unpolarized light is incident on a pair of ideal linear polarizers whose transmission axes make an angle of 45q with each other. The transmitted light intensity through both polarizers is what percentage of the incident intensity? | [
"100%",
"75%",
"40%",
"25%"
] | D |
4,374 | If 40 liters of N_2 gas are collected at 22°C over water at a pressure of .957 atm, what is the volume of dry nitrogen at STP (Standard temperature and pressure)? | [
"32.8 liters",
"34.4 liters",
"42.1 liters",
"40 liters"
] | B |
10,611 | A cascade of $n$ identical independent binary symmetric channels each with raw error probability $p$, and $0<p<1$. What is the capacity of the cascade when $n$ goes to infinity? | [
"$n$",
"0.0",
"1.0",
"$p$"
] | B |
11,583 | An air-vapor mixture consisting of 1lbmof dry air and 015lbmof vapor is at 85°F and 20psia. Find the partial pressure of water vapor. | [
"0.1234psia",
"1.0psia",
"0.4719psia",
"0.5964psia"
] | C |
3,938 | Calculate the standard enthalpy change, ∆H°, for the combustion of ammonia, NH_3(g), to give nitric oxide, NO(g), and water H_2O(l). The enthalpies of formation, ∆H°_f, are - 68.32 Kcal/mole for H_2O(l) , - 11.02 Kcal/mole for NH_3 (g) , and 21.57 Kcal/mole for NO(g). | [
"-69.89 Kcal/mole",
"-199.22 Kcal/mole",
"-279.56 Kcal/mole",
"-409.92 Kcal/mole"
] | A |
9,620 | What must be the speed v of a lead bullet if it melts when striking a steel slab? The initial temperature of the bullet is T_0 = 300° K, its melting point is T_1 = 700° K, its heat of melting q = 5 cal gr^-1, and its specific heat c = 0.03 cal gr^-1 K°^-1. | [
"420 m/sec",
"450 m/sec",
"500 m/sec",
"380 m/sec"
] | D |
3,852 | Liquid helium boils at 4°K. What is the boilingtemperature onthe Fahrenheit scale? | [
"-202°F",
"269°F",
"4°F",
"-452°F"
] | D |
11,329 | Compute the natural convective heat transfer coefficient for a vertical plate at a distance of 8 in. from the bottom of the plate. The plate is heated to a temperature of 200°F on one side and the other side is in contact with air at 68°F and at atmospheric pressure. | [
"0.81 Btu/hr-ft^2-°F",
"1.08 Btu/hr-ft^2-°F",
"0.536 Btu/hr-ft^2-°F",
"0.0181 Btu/hr-ft^2-°F"
] | B |
9,116 | Suppose the number of neutrons in a reactor that is starting up doubles each minute reaching one billion neutrons in 10 minutes. When did the number of neutrons reach half a billion? | [
"9 minutes.",
"4 minutes.",
"7 minutes.",
"6 minutes."
] | A |
4,495 | A 50 ml solution of sulfuric acid was found to contain 0.490 g of H_2SO_4. This solution was titrated against a sodium hydroxide solution of unknown concentration. 12.5 ml of the acid solution was required to neutralize 20.0 ml of the base. What is the concentration of the sodium hydroxide solution. | [
"0.125 M",
"0.088 M",
"0.225 M",
"0.250 M"
] | A |
3,387 | All of the following are examples of hydrolysis EXCEPT | [
"conversion of fats to fatty acids and glycerol",
"conversion of proteins to amino acids",
"conversion of starch to simple sugars",
"conversion of pyruvic acid to acetyl CoA"
] | D |
2,852 | Describe the structure and function of the nuclear membrane. | [
"The nuclear membrane functions independently of the endoplasmic reticulum and the Golgi apparatus",
"The nuclear membrane is a single-leaflet structure",
"The nuclear membrane consists of two leaflets of membrane, with nuclear pores providing a means for nuclear-cytoplasmic communication.",
"The nuclear memb... | C |
10,266 | Compute the mean molecular speed v in the light gas hydrogen (H2) in m/s | [
"1750.0",
"1500.0",
"2200.0",
"2100.0"
] | A |
3,821 | When a particle of mass $9.1 \times 10^{-28} \mathrm{~g}$ in a certain one-dimensional box goes from the $n=5$ level to the $n=2$ level, it emits a photon of frequency $6.0 \times 10^{14} \mathrm{~s}^{-1}$. Find the length of the box. | [
"2.7 $\\mathrm{~nm}$",
"2.0 $\\mathrm{~nm}$",
" 1.8$\\mathrm{~nm}$",
"1.2 $\\mathrm{~nm}$"
] | C |
9,880 | A single-electron atom has the electron in the l = 2 state. The number of allowed values of the quantum number m_l is | [
"8",
"5",
"3",
"2"
] | B |
3,436 | When oxygen becomes unavailable, this process regenerates NAD+, allowing respiration to continue. | [
"Calvin cycle",
"Fermentation",
"Glycolysis",
"Oxidative phosphorylation"
] | B |
9,335 | A spacecraft is placed in orbit $200 \mathrm{~km}$ above Earth in a circular orbit. Calculate the minimum escape speed from Earth. | [
"6.42 $ \\mathrm{~km} / \\mathrm{s}$",
" 3.23 $ \\mathrm{~km} / \\mathrm{s}$",
"4.76 $ \\mathrm{~km} / \\mathrm{s}$",
"5.03 $ \\mathrm{~km} / \\mathrm{s}$"
] | B |
9,960 | An automobile drag racer drives a car with acceleration $a$ and instantaneous velocity $v$. The tires (of radius $r_0$ ) are not slipping. For what initial velocity in the rotating system will the hockey puck appear to be subsequently motionless in the fixed system? | [
"1.1 $\\omega r_0$",
"0.7 $\\omega R$",
"0.9 $\\omega R$",
" 0.5 $\\omega R$"
] | D |
3,660 | Would you expect He_2^\oplus to be more stable than He_2? Than He? | [
"He_2^\\oplus is the most stable among He, He_2, and He_2^\\oplus",
"He_2^\\oplus is more stable than He_2 but less stable than He",
"He, He_2, and He_2^\\oplus have the same stability",
"He_2^\\oplus is the least stable among He, He_2, and He_2^\\oplus"
] | B |
4,633 | Calculate the number of H^+ ions in the inner compartment of a single rat liver mitochondrion, assuming it is a cylinder 1.8\mu long and 1.0\mu in diameter at pH 6.0. | [
"1000 H^+ ions",
"900 H^+ ions",
"843 H^+ ions",
"950 H^+ ions"
] | C |
10,495 | What does EXE do when the STP solver times out on a constraint query for a particular path? | [
"Assume that the query is not satisfiable and stop executing the path",
"Remove a subset of the constraints and retry the query.",
"Pause the execution until the query is resolved.",
"Skip the query and continue executing the path."
] | A |
10,638 | Based on the paper “SoK: SSL and HTTPS: Revisiting past challenges and evaluating certificates trust model enhancements”, which of the following statements are false? | [
"Valid DV certificates provide more confidence to a user that she is connecting to the intended party than valid EV certificates.",
"OCSP stapling allows a server to prove to a browser that its certificate hasn’t been revoked.",
"DANE makes it difficult for an adversary to launch a SSL stripping attack.",
"Se... | A |
3,557 | Assume all gases are perfect unless stated otherwise. Unless otherwise stated, thermodynamic data are for 298.15 K. Calculate the work needed for a $65 \mathrm{~kg}$ person to climb through $4.0 \mathrm{~m}$ on the surface of the Moon $\left(g=1.60 \mathrm{~m} \mathrm{~s}^{-2}\right)$. | [
"$3.8 \\times 10^2$ $\\mathrm{J}$",
"$1.04 \\times 10^3$ $\\mathrm{J}$",
"$6.0 \\times 10^2$ $\\mathrm{J}$",
"$4.2 \\times 10^2$ $\\mathrm{J}$"
] | D |
4,561 | (a) You desire to plate 5g of Ag from a solution of Ag^+ . Determine the number of amperes required over a period of 1000 seconds. (b) With a current of 0.5 ampere, how much time is required to plate out 10g of gold from an Au^3+ solution? | [
"3.50 amps and 32,000 seconds",
"4.45 amps and 29,400 seconds",
"4.75 amps and 28,500 seconds",
"2.95 amps and 33,000 seconds"
] | B |
10,234 | A glass bulb with volumetric expansion coefficient\beta_Bis weighed in water at temperatures T and T_1 . The weights of the displaced water are W and W_1, respectively. Find the volumetric expansion co-efficient\beta_Wof the water in the temperature interval from T to T_1. | [
"β_W = (W/W_1)β_B + [(W_1 - W)/{W(T - T_1)}]",
"\beta_W= (W/W_1)\beta_B- [(W - W_1)/{W_1(T_1 - T)}]",
"β_W = (W_1/W)β_B - [(W_1 - W)/{W(T - T_1)}]",
"\beta_W= (W/W_1)\beta_B+ [(W - W_1)/{W_1(T_1 - T)}] = [\beta_B+ {(W - W_1)/W_1} {\beta_B+ (1/\\DeltaT)}]"
] | D |
11,542 | A multiple disc clutch is used to operate the speed regulating gears of a lathe. If the torque delivered by the clutch is 400 lbs.-in., evaluate the number of discs necessary and the force acting on them while the clutch is in operation. Assume a factor of safety of 2 and limit the disc friction surface sizes between 5... | [
"Three discs, Force on the discs = 1028 lbs.",
"Four discs, Force on the discs = 1200 lbs.",
"Two discs, Force on the discs = 1600 lbs.",
"Four discs, Force on the discs = 800 lbs."
] | A |
3,114 | All of the following support the endosymbiotic theory that ancestors of mitochondria and chloroplasts were once independent, free-living prokaryotes EXCEPT: | [
"Mitochondria and chloroplasts divide independently of the eukaryotic host cell by a process similar to binary fission.",
"Mitochondria and chloroplasts have ribosomes that more closely resemble those of bacteria than of eukaryotic cells.",
"Mitochondria and chloroplasts function independently from the eukaryot... | C |
11,544 | A pulley 8 in. in diameter rotates at 500 rpm and drives a 15 in. diameter pulley.Determine the speed of the driver pulleyfor a condition of no slip between the pulley and the beltand then for a total loss (slip and creep) of 2%. | [
"280 rpm",
"261.4 rpm",
"250 rpm",
"275 rpm"
] | B |
9,152 | In a hologram interference experiment with a helium-neon laser, the surface under test is illuminated and viewed at normal incidence. If the displacement to be determined is 2500 nm, by how many fringes will it be represented if (a) the displacement is normal to the surface, (b) it is 45° to the normal, and (c) it is i... | [
"(a) 7.9 fringes, (b) 0 fringes, (c) 5.6 fringes",
"(a) 3.5 fringes, (b) 7.9 fringes, (c) 2.8 fringes",
"(a) 0 fringes, (b) 3.5 fringes, (c) 5.6 fringes",
"(a) 7.9 fringes, (b) 5.6 fringes, (c) 0 fringes"
] | D |
9,734 | When the color yellow is seen on your TV screen the phosphors being activated on the screen are | [
"blue and yellow.",
"red and green.",
"blue and red.",
"red and blue."
] | B |
10,405 | A is any 20 × 20 array. Write a FUNCTION subprogram to compute PD (A, I, J) = [ A(I-1,J) + A(I+1,J) + A(I,J-1) + A(I,J+1)] / 4 Then use it to compute B_ij = (1-\alpha)B_ij+ \alpha [{Bi-1, j+Bi+1, j+ Bi, j-1+ Bi, j+1} / 4]. | [
"FUNCTION PD (A, I, J) DIMENSION A (20, 20) PD = (A (I, J-1) + A (I, J+1) + A (I-1, J) + A (I+1, J)) / 5.0 RETURN END; B(I, J) = [(1.-ALPHA)*B(I, J) + ALPHA*PD(B, I, J)].",
"FUNCTION PD (A, I, J) DIMENSION A (20, 20) PD = (A (I-1, J) + A (I+1, J) + A (I, J-1) + A (I, J+1)) / 4.0 RETURN END; B(I, J) = [(1.-ALPHA)*... | B |
3,021 | How can you determine whether or not a given population is in genetic equilibrium? | [
"Compare gene frequencies and genotype frequencies of two generations.",
"Evaluate the population's response to environmental stress",
"Assess the mutation rates of the population's genes",
"Compare the population size over generations"
] | A |
10,582 | What arePackedarrays? How do they differfrom conventional arrays? | [
"Packed arrays store values in memory in the most compact way possible, taking up less space but increasing processing time.",
"Packed arrays require manual indexing and management by the programmer, unlike conventional arrays which are automatically managed by the system.",
"Packed arrays use a linked list str... | A |
3,532 | Hypochlorous acid is an unstable compound, and one of the decomposition products is chlorine gas, Cl2. The decomposition of the acid lowers its concentration over time. What effect will the decomposition of one-fourth of the acid have on the agreement between the endpoint of the titration and the equivalence point duri... | [
"The endpoint would be before the ideal equivalence point.",
"The endpoint would be after the ideal equivalence point.",
"The endpoint would be significantly far from the ideal equivalence point.",
"It is impossible to determine."
] | A |
10,010 | The volatile liquids $A$ and $\mathrm{B}$, for which $P_A^*=165$ Torr and $P_B^*=85.1$ Torr are confined to a piston and cylinder assembly. Initially, only the liquid phase is present. As the pressure is reduced, the first vapor is observed at a total pressure of 110 . Torr. Calculate $x_{\mathrm{A}}$ | [
"0.665",
"0.525",
" 0.312",
"0.250"
] | C |
3,834 | The discovery of the element argon by Lord Rayleigh and Sir William Ramsay had its origins in Rayleigh's measurements of the density of nitrogen with an eye toward accurate determination of its molar mass. Rayleigh prepared some samples of nitrogen by chemical reaction of nitrogencontaining compounds; under his standar... | [
"0.022",
" 0.011",
"0.003",
"0.030"
] | B |
3,090 | Why is a moss plant restricted to a height of less thanabout 15 cm? | [
"Moss plants are limited in height by the competitive shading of taller plants",
"Moss plants require direct sunlight, which limits their height",
"Moss plants are restricted to a height of less than 15 cm due to the inefficiency of the rhizoids in absorbing water and minerals, absence of True vascular and supp... | C |
11,450 | A mixture of ideal gases consisting of 0.4 mole fraction of N_2 and 0.6 mole fraction of argon is flowing at a rate of 2500 lbm/hr through a heat exchanger, where its temperature is increased from 80°F to 450°F. Assuming that the heating process takes place at a constant pressure of 14.7 psia, determine the rate of hea... | [
"151466.45 Btu/hr",
"175000 Btu/hr",
"135000 Btu/hr",
"200000 Btu/hr"
] | A |
9,541 | An airplane with its nose pointing north with an airspeed of 40 km/h in a 30-km/h crosswind (at right angles) has a groundspeed of | [
"40 km/h",
"60 km/h",
"50 km/h",
"10 km/h"
] | C |
11,622 | Design a bar to resist pure tension of 4000 lb., based on a factor of safety of 2.5. Tensile strength of the material = 175 psi. | [
"14 in. × 3 in.",
"16 in. × 4 in.",
"18 in. × 6 in.",
"15 in. × 5 in."
] | B |
9,654 | Identify $\mathrm{X}$ in the following nuclear reactions: (a) ${ }^1 \mathrm{H}+$ ${ }^9 \mathrm{Be} \rightarrow \mathrm{X}+\mathrm{n} ;$ (b) ${ }^{12} \mathrm{C}+{ }^1 \mathrm{H} \rightarrow \mathrm{X} ;$ (c) ${ }^{15} \mathrm{~N}+{ }^1 \mathrm{H} \rightarrow{ }^4 \mathrm{He}+\mathrm{X}$. Appendix F will help. | [
"${ }^{14} \\mathrm{~N}$",
"${ }^{11} \\mathrm{~B}$",
"${ }^8 \\mathrm{~B}$",
" ${ }^9 \\mathrm{~B}$"
] | D |
9,752 | From the indices of refraction given below, calculate the rotation of the plane of polarization for violet light \lambda = 396.0 nm, in a quartz plate cut perpendicular to the optic axis and 1 mm thick. [\lambda / (396.0 nm)] [n_R/ (1.55610)] [n_L/ (1.55821)] (Refractive Indices for Quartz) | [
"50 degrees",
"90 degrees",
"45 degrees",
"30 degrees"
] | A |
10,156 | Which of these quantities decreases as the inverse square of distance for distances far from the objects producing the fields? | [
"the magnetic field produced by an infinitely long, straight current-carrying wire",
"the magnetic field produced by a finite-length current-carrying wire",
"the magnetic field produced by a current loop",
"the electric field produced by a finite-length charged rod"
] | D |
9,127 | You wish to put a 1000-kg satellite into a circular orbit 300 km above the earth's surface. How much work must be done to the satellite to put it in orbit? The earth's radius and mass are $R_E}=$ $6.38 \times 10^6 m$ and $m_E=5.97 \times 10^{24} kg$. (Unit: 10^10 J) | [
"2.50",
"3.98",
"3.26",
"2.75"
] | C |
10,543 | Illustrate transfer of control in a PL/I program, usingGOTO statements. | [
"The GOTO statement in PL/I program doesn't alter the processing sequence.",
"The GOTO statement in a PL/I program resumes processing at the next function or procedure.",
"The GOTO statement in PL/I program alters the processing sequence, discontinues the normal sequential execution and processing resumes at a ... | C |
9,741 | A bungee cord is 30.0 m long and, when stretched a distance x, it exerts a restoring force of magnitude kx. Your father-in-law (mass 95.0 kg) stands on a platform 45.0 m above the ground, and one end of the cord is tied securely to his ankle and the other end to the platform. You have promised him that when he steps of... | [
"1.0",
"0.602",
"1.8",
"0.45"
] | B |
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