Kaplan MCAT Topic Test Physics physical discrete

Kaplan MCAT Topic Test Physics physical discrete - Physics...

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Unformatted text preview: Physics Discretes Test Time: 30 Minutes Number of Questions: 30 This test consists of 30 discrete questions—questions that are NOT based on a descriptive passage. These discretes comprise 15 of the 77 questions on the Physical Sciences and Biological Sciences sections of the MCAT. MCAT PHYSICS DISCRETES TEST DIRECTIONS: The following questions are not based on a descriptive passage; you must select the best answer to these questions. If you are unsure of the best answer, eliminate the choices that you know are incorrect, then select an answer from the choices that remain. Indicate your selection by blackening the corresponding circle on your answer sheet. A periodic table is provided below for your use with the questions. PERIODIC TABLE OF THE ELEMENTS 1 H 1.0 2 He 4.0 3 Li 6.9 4 Be 9.0 5 B 10.8 6 C 12.0 7 N 14.0 8 O 16.0 9 F 19.0 10 Ne 20.2 11 Na 23.0 12 Mg 24.3 13 Al 27.0 14 Si 28.1 15 P 31.0 16 S 32.1 17 Cl 35.5 18 Ar 39.9 19 K 39.1 20 Ca 40.1 21 Sc 45.0 22 Ti 47.9 23 V 50.9 24 Cr 52.0 25 Mn 54.9 26 Fe 55.8 27 Co 58.9 28 Ni 58.7 29 Cu 63.5 30 Zn 65.4 31 Ga 69.7 32 Ge 72.6 33 As 74.9 34 Se 79.0 35 Br 79.9 36 Kr 83.8 37 Rb 85.5 38 Sr 87.6 39 Y 88.9 40 Zr 91.2 41 Nb 92.9 42 Mo 95.9 43 Tc (98) 44 Ru 101.1 45 Rh 102.9 46 Pd 106.4 47 Ag 107.9 48 Cd 112.4 49 In 114.8 50 Sn 118.7 51 Sb 121.8 52 Te 127.6 53 I 126.9 54 Xe 131.3 55 Cs 132.9 56 Ba 137.3 57 La * 138.9 72 Hf 178.5 73 Ta 180.9 74 W 183.9 75 Re 186.2 76 Os 190.2 77 Ir 192.2 78 Pt 195.1 79 Au 197.0 80 Hg 200.6 81 Tl 204.4 82 Pb 207.2 83 Bi 209.0 84 Po (209) 85 At (210) 86 Rn (222) 87 Fr (223) 88 Ra 226.0 89 Ac † 227.0 104 Unq (261) 105 Unp (262) 106 Unh (263) 107 Uns (262) 108 Uno (265) 109 Une (267) * 58 Ce 140.1 59 Pr 140.9 60 Nd 144.2 61 Pm (145) 62 Sm 150.4 63 Eu 152.0 64 Gd 157.3 65 Tb 158.9 66 Dy 162.5 67 Ho 164.9 68 Er 167.3 69 Tm 168.9 70 Yb 173.0 71 Lu 175.0 † 90 Th 232.0 91 Pa (231) 92 U 238.0 93 Np (237) 94 Pu (244) 95 Am (243) 96 Cm (247) 97 Bk (247) 98 Cf (251) 99 Es (252) 100 Fm (257) 101 Md (258) 102 No (259) 103 Lr (260) GO ON TO THE NEXT PAGE. 2 as developed by Physics Discretes Test 1 . An ideal experiences: gas compressed adiabatically A . a decrease in temperature and an increase internal energy. B . a decrease in temperature and a decrease internal energy. C . an increase in temperature and an increase internal energy. D . no change in either the temperature internal energy. in in 4 . An object is moving counterclockwise in a circle at constant speed. Which of the following diagrams correctly indicates both its velocity vector and its acceleration vector? A. in or at v 2 . Two identical rods having temperatures 100°C and 50°C, respectively, are brought into contact. If the system is isolated from the environment, its entropy: 3 a v a B. A. B. C. D. C. v increases. decreases. remains the same. cannot be determined. ar D. v a 5 . An ambulance originally at rest has its siren going. The ambulance starts accelerating away from a boy standing nearby. He will hear: A. B. C. D. a decrease in the pitch of the siren. no change in the pitch of the siren. an increase in the pitch of the siren. an increase, and then a decrease in the pitch of the siren. A 1.0 kg object moving east with a velocity of 10 m/s has a head-on collision with a 0.5 kg object which is at rest. Neglecting friction, what is the momentum of the system after collision? A. B. C. D. 15 kg • m/s; east 15 kg • m/s; west 10 kg • m/s; east 10 kg • m/s; west GO ON TO THE NEXT PAGE. KAPLAN 3 6 . The diagram shows energy levels E1, E 2, E 3, and E4 in an atom. If the transition from energy E3 to E2 gives rise to a photon of radiation of a particular wavelength, which of the following transitions could give rise to a photon of radiation of longer wavelength? 9 . An object (O) is placed within the focal length f of a converging lens. The image (I) is located at which of the following positions? O A. f E4 f' Energy (eV) E3 I I B. O E2 f C. f' O f' E1 A. B. C. D. E 4 to E1 E 3 to E1 E 2 to El E 4 to E3 f D. I O f f' 7 . The activity of a radioactive source falls to onesixteenth of its original value in 32 minutes. What is the half-life, in minutes, of this decay process? A. B. C. D. 2 4 8 16 min min min min I 1 0 . When the 2/3 Ω resistor is replaced by an 8/3 Ω resistor, the voltage across the resistor changes from: 9V 8 . A parallel plate air capacitor is connected across a battery of constant emf. If the separation of the plates is decreased, which of the following increases? I. Charge on the plates of the capacitor II. Potential difference between the plates of the capacitor III. Capacitance of the capacitor A. B. C. D. III only I and II only I and III only II and III only 2/3 Ω 1/3 Ω A. B. C. D. 4 4 6 6 V V V V to to to to 6 8 4 8 V. V. V. V. Physics Discretes Test 1 1 . From the data shown below, estimate the halflife of element X. Number of Undecayed Nucleii 10 x 105 1 3 . In the diagram below a stream of electrons leaves the electron gun at G and strikes the fluorescent screen at P. When the current is switched on at S, it flows through the wire coils in an anticlockwise direction as seen by the observer at O; the observer sees the spot of light at P: Element X 7.5 x 105 G 5 x 105 P O 2.5 x 105 0 1.5 3.0 4.5 6.0 S Years elapsed A. B. C. D. 1.5 years 3.0 years 4.5 years 6.0 years 1 2 . A planet has a diameter one half of the Earth’s diameter and a mass that is one half of the Earth’s mass. What would be the acceleration due to gravity on the planet? A. B. C. D. 2.45 m/s2 4.90 m/s2 9.80 m/s2 19.6 m/s2 A. B. C. D. move downwards. move to the left. move to the right. remain still. 1 4 . Object A of mass M is released from height H while object B of mass 0.5 M is released from height 2H. What is the ratio of the velocity of object A to the velocity of object B immediately before they hit the ground? (Note: Assume that air resistance is negligible.) A. B. C. D. 1:1 1: 2 1:2 1:4 GO ON TO THE NEXT PAGE. KAPLAN 5 1 5 . In the hydraulic lift shown below, piston A has a cross-sectional diameter of 2 m and piston B a cross-sectional diameter of 4 m. If the force exerted by piston A on the liquid is doubled, the force lifting up piston B is: A A. B. C. D. B 1 7 . A fluid flows through a pipe such that the velocity at point A is 1/4 that at point B. What is the ratio of the radius of the pipe at point A to that at point B? A. B. C. D. 1:4 2:1 4:1 1:2 1 8 . A cube of wood whose sides are each 10 cm weighs 16 N in air. When half submerged in an unknown liquid it weighs only 10 N. What is the density of the liquid? (Note: Assume g = 10 m/s2.) decreased by a factor of 4. increased by a factor of 2. increased by a factor of 4. increased by a factor of 8. A . 600 kg/m3 B. 800 kg/m3 C . 1,000 kg/m3 D . 1,200 kg/m3 1 6 . Which of the following is true of the adiabatic expansion from point Q to R? P T Q S R 1 9 . Two fixed charges of +Q and +3Q repel each other with a force, F. If an additional charge of –2Q is now added to each of the two charges, what is the new force between them? A. B. C. D. Zero F/6 attraction F/3 repulsion F/3 attraction V A . The internal energy at Q is greater than at R. B . The internal energy at R is greater than at Q. C . Heat is released by the gas in moving from Q to R. D . Heat is absorbed by the gas in moving from Q to R. 2 0 . If the binding energy of a nucleus is 186.2 MeV, what is its mass defect? (Note: 1 amu yields 931 MeV of energy, 1 amu is equivalent to 1.66 × 10–27 kg.) A. B. C. D. 3.3 6.6 8.3 3.1 × × × × 10–28 10–28 10–27 10–25 kg kg kg kg Physics Discretes Test 2 1 . A block starts from rest and slides down along one quadrant of a frictionless circular track whose radius is one meter. Which of the following is true? 2 4 . In a frictionless horizontal mass spring system, as the mass moves from the point of maximum expansion through the equilibrium position to the point of maximum compression, the potential energy of the system: A. B. C. D. 1m A . The speed of the block at the bottom will be the same as if it had fallen vertically. B . Mechanical energy will not be conserved. C . The acceleration of the block is constant throughout the descent. D . The total work done by gravity is greater than if the block had fallen vertically. decreases continually . increases then decreases. decreases then increases. remains the same. 2 5 . Which of the following diagrams accurately depicts the electric field lines between 2 charges of equal magnitude but opposite sign? A. C. B. D. 2 2 . Which one of the following is a scalar quantity? A. B. C. D. Velocity Force Impulse Kinetic energy 2 3 . A fireboat is fighting a fire to its right but also has its hoses going full blast into the water to its left. Which law of physics best explains the reason for this? A. B. C. D. Newton’s law of gravity Newton’s second law Newton’s third hew Conservation of energy GO ON TO THE NEXT PAGE. KAPLAN 7 MCAT 2 6 . Four positively charged spheres (+1 C each) and four negatively charged spheres (–1 C each) are distributed at equally spaced intervals around a circular hoop whose radius is 1 m as shown below. What is the electrostatic potential at the center of the hoop? (Note: k is the electrostatic constant.) 2 8 . In an attempt to restore the natural rhythm of a heart attack victim, electric shock plates are sometimes used. The shock plates are run off a 10 V battery and draw current at a constant 30 A. If each shock draws 300 J of electrical energy, what is the duration of the shock? A. B. C. D. + + + + – – – – 2 9 . A bat locates obstacles in its flight path by emitting sound in the same direction as it travels. When the sound encounters an obstacle, it is reflected back to the bat. Assuming that the bat’s velocity and the frequency of the emitted sound are constant, and assuming the obstacle is stationary, which of the following describes the frequency observed by the bat? A . It is greater than the frequency emitted by the bat. B . It is less than the frequency emitted by the bat. C . It is the same as the frequency emitted by the bat. D . Its character cannot be determined. A. 0V B . 4k V C . 8k V D . 16k V 2 7 . Which of the following quantities can be expressed dimensionally as M • L2/T2, where M is mass, L is length, and T is time? 0.1 sec 0.3 sec 1.0 sec 3.0 sec 3 0 . An object is moved from 2f towards f, where f is the focal length of this converging lens. The image formed on the other side of the lens will move from: I. Torque II. Work III. Energy A. B. C. D. I only I and II only II and III only I, II, and III 2f f A. B. C. D. f f to 2f. 2f to f/2. 2f to f. 2f to infinity. END OF TEST 2f ...
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This note was uploaded on 06/21/2009 for the course SSD 34 taught by Professor Dfdedf during the Spring '09 term at Abraham Baldwin Agricultural College.

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