CST Practice Physics ExamYoung NAME

CST Practice Physics Exam

Long Answer Questions

For question 1

A 0.12-meter-long electromagnetic (radar) wave is emitted by a weather station and reflected from a nearby thunderstorm.

1) Determine the frequency of the radar wave.

Multiple Choice Questions

2) Approximately how far will an object near Earth’s sur-face fall in 3.0 seconds?

(a) 88 m (c) 29 m

(b) 44 m (d) 9.8 m

3) When the speed of an object is halved, its kinetic energyis

(a) quartered (c) the same

(b) halved (d) doubled

4) In a vacuum, the speed of electromagnetic waves−

(a) depends on the type of wave.

(b) depends on the frequency of the wave.

(c) is approximately 3× 108 m/s.

(d) is approximately 3× 106 m/s.

5) An object starts from rest and falls freely. What is thevelocity of the object at the end of 3.00 seconds?

(a) 9.81 m/s (c) 29.4 m/s

(b) 19.6 m/s (d) 88.2 m/s

6) Which waves are not electromagnetic waves?

(a) Visible light

(b) Radio

(c) X-rays

(d) Sound

7) A 1.0-kilogram mass changes speed from 2.0 metersper second to 5.0 meters per second. The change inthe object’s momentum is

(a) 9.0 kg-m/sec (c) 3.0 kg-m/sec

(b) 21 kg-m/sec (d) 29 kg-m/sec

8) An 800-newton person is standing in an elevator. Ifthe upward force of the elevator on the person is 600newtons, the person is

(a) at rest

(b) accelerating upward

(c) accelerating downward

(d) moving downward at constant speed

9) Which type of wave is sound, traveling through a blockof metal?

(a) Transverse

(b) Longitudinal

(c) Elliptical

(d) Shock

10) The speed of sound depends on the−

(a) amplitude of the wave.

(b) Doppler effect.

(c) properties of the medium it’s traveling through.

(d) source of the sound.

11) What does a wave carry?

(a) Energy.

(b) Mass.

(c) Momentum.

(d) All of the above.

12) The diagram below shows a projectile moving withspeed v at the top of its trajectory.

Which vector best represents the acceleration of theprojectile in the position above?

(a) (c)

(b) (d)

13) Which of the following electromagnetic waves has thelowest frequency?

(a) violet light (c) yellow light

(b) green light (d) red light

14) The diagram below shows a circuit with three resis-tors.

What is the resistance of resistor R3?

(a) 6.0 Ω (c) 12 Ω(b) 2.0 Ω (d) 4.0 Ω

15) A basketball player who weighs 600 newtons jumps0.5 meter vertically off the floor. What is her kineticenergy just before hitting the floor?

(a) 30 J (c) 300 J

(b) 60 J (d) 600 J

16) The diagram below shows two resistors connected inseries to a 20.-volt battery.

If the current through the 5.0-ohm resistor is 1.0 am-pere, the current through the 15.0-ohm resistor is

(a) 1.0 A (c) 3.0 A

(b) 0.33 A (d) 1.3 A

17) In the diagram below, the distance between points Aand B on a wave is 5.0 meters.

The wavelength of this wave is

(a) 1.0 m (c) 5.0 m

(b) 2.0 m (d) 4.0 m

18) If the speed of a moving object is doubled, which quan-tity associated with the object must also double?

(a) its momentum

(b) its kinetic energy

(c) its acceleration

(d) its gravitational potential energy

19) Four forces are acting on an object as shown in the di-agram below. If the object is moving with a constantvelocity, the magnitude of force F must be

(a) 0 N (c) 100 N

(b) 20 N (d) 40 N

20) A man weighs 900 newtons standing on a scale in astationary elevator. If some time later the reading onthe scale is 1200 newtons, the elevator must be mov-ing with

(a) constant acceleration downward

(b) constant speed downward

(c) constant acceleration upward

(d) constant speed upward

21) A 2.0-kilogram cart moving due east at 6.0 metersper second collides with a 3.0-kilogram cart movingdue west. The carts stick together and come to restafter the collision. What was the initial speed of the3.0-kilogram cart?

(a) 1.0 m/s (c) 9.0 m/s

(b) 6.0 m/s (d) 4.0 m/s

22) If the velocity of an automobile is doubled, its kineticenergy

(a) decreases to one-half

(b) doubles

(c) decreases to one-fourth

(d) quadruples

23) The product of an object’s mass and velocity is equalto

(a) force (c) kinetic energy

(b) weight (d) momentum

24) Two objects of fixed mass are moved apart so thatthey are separated by three times their original dis-tance. Compared to the original gravitational forcebetween them, the new gravitational force is

(a) one-third as great (c) three times greater

(b) one-ninth as great (d) nine times greater

25) Equilibrium exists in a system where three forces areacting concurrently on an object. If the system in-cludes a 5.0-newton force due north and a 2.0-newtonforce due south, the third force must be

(a) 7.0 N south (c) 3.0 N south

(b) 7.0 N north (d) 3.0 N north

26) Heat will always flow from object A to object B ifobject B has a lower

(a) mass (c) specific heat

(b) total energy (d) temperature

27) Which phase change represents a decrease in entropy?

(a) solid to gas (c) gas to liquid

(b) solid to liquid (d) liquid to gas

For questions 28-29

28) If resistance R2 were removed, the current in ammeterA would

(a) decrease (c) remain the same

(b) increase

29) If resistance R2 were removed, the potential differenceacross R1 would

(a) decrease (c) remain the same

(b) increase

For questions 30-31

The diagram below represents a satellite in an elliptical orbit about the Earth. The highest point, A, is four Earth radii (4R) fromthe center of the Earth. The lowest point, B, is two Earth radii (2R) from the center of the Earth. The mass of the satellite is3.0× 106 kilograms.

30) Which vector represents the direction of the cen-tripetal force on the satellite at B?

(a) (c)

(b) (d)

31) Which vector represents the direction of the satellite’svelocity at A?

(a) (c)

(b) (d)

32) A satellite is moving at constant speed in a circular orbit about the Earth, as shown in the diagram below.

The net force acting on the satellite is directed toward point

(a) A (c) C

(b) B (d) D

33) As the color of light changes from red to yellow, thefrequency of the light

(a) decreases (c) remains the same

(b) increases

34) The speed of a transverse wave in a string is 12 metersper second. If the frequency of the source producingthis wave is 3.0 hertz, what is its wavelength?

(a) 0.25 m (c) 36 m

(b) 2.0 m (d) 4.0 m

35) The amplitude of a sound wave is to its loudness asthe amplitude of a light wave is to its

(a) brightness (c) color

(b) frequency (d) speed

36) A characteristic common to sound waves and lightwaves is that they

(a) are longitudinal (c) transfer energy

(b) are transverse (d) travel in a vacuum

37) What type of wave is sound traveling in water?

(a) torsional (c) elliptical

(b) transverse (d) longitudinal

38)

Earth

DistanceSatellite

Which satellite would cause Earth to feel the GREAT-EST gravitational force?

(a) A satellite with the same mass, twice the distanceaway

(b) A satellite with double the mass, the same dis-tance away

(c) A satellite with the same mass, half the distanceaway

(d) A satellite with double the mass, half the distanceaway

39) Which quantity must be the same for each componentin any series circuit?

(a) voltage (c) resistance

(b) power (d) current

40) An object with a speed of 20 meters per second has akinetic energy of 400 joules. The mass of the objectis

(a) 1.0 kg (c) 0.50 kg

(b) 2.0 kg (d) 40 kg

41) The diagram below shows three resistors, R1, R2, andR3, connected to a 12-volt battery.

If voltmeter V1 reads 3 volts and voltmeter V2 reads4 volts, what is the potential drop across resistor R3?

(a) 12 V (c) 0 V

(b) 5 V (d) 4 V

42) Which pair of pulses represented below, movingthrough the same medium, will produce the pulseshown below when they are superimposed?

(a) (c)

(b) (d)

43) The rate of change of work with respect to time iscalled

(a) energy (c) force

(b) momentum (d) power

44) An ordered stream of gas molecules is injected into acovered glass jar. After a few minutes, which reactionwill most likely occur?

(a) The molecules in the jar will remain in their or-dered pattern.

(b) The molecules in the jar will move in random, dis-organized directions.

(c) The molecules in the jar will all move to the verybottom of the jar.

(d) The molecules in the jar will form a new, orderedpattern.

45) A boy throws a ball straight up into the air. Duringits rise and fall, its kinetic energy−

(a) continually decreases.

(b) increases then decreases.

(c) decreases then increases.

(d) remains the same.

46) As an object falls, its potential energy−

(a) decreases.

(b) increases.

(c) stays constant.

(d) cannot be determined.

47) What is the distance traveled by an object that moveswith an average speed of 6.0 meters per second for8.0 seconds?

(a) 0.75 m (c) 14 m

(b) 1.3 m (d) 48 m

48) What is heat flow?

(a) A measure of the order or disorder of a system

(b) A measure of the temperature of a system

(c) The transfer of energy between systems

(d) The transfer of momentum between systems

49)

B)A)

Which system has greater entropy?

(a) A

(b) B

(c) Both A and B have the same amount of entropy.

(d) Cannot be determined.

50) A student drops an object from the top of a buildingwhich is 19.6 meters from the ground. How long doesit take the object to fall to the ground?

(a) 19.6 seconds (c) 3.00 seconds

(b) 2.00 seconds (d) 4.00 seconds

51) In an ideal gas, entropy is a measure of the

(a) volume of the molecules

(b) mass of the molecules

(c) forces of attraction between the molecules

(d) disorder of the molecules

52) Entropy is a quantity that measures the−

(a) thermal change of a system.

(b) order or disorder of a system.

(c) energy of random motion of a system.

(d) heat flow of a system.

53)

2 kg2 kg

10 m/s5 m/s

If the balls shown collide in an inelastic collision andstick together, what will be the velocity of the ballsafter the collision?

(a) 5 m/s to the left

(b) 2.5 m/s to the left

(c) 11 m/s to the left

(d) 15 m/s to the left

54) Which is a vector quantity?

(a) momentum (c) speed

(b) energy (d) power

For question 55

The diagram below shows an object with a mass of 1.0 kilogram attached to a string 0.50 meter long. The object is moving at aconstant speed of 5.0 meters per second in a horizontal circular path with center at point O.

55) While the object is undergoing uniform circular mo-tion, its acceleration

(a) has a magnitude of zero

(b) increases in magnitude

(c) is directed toward the center of the circle

(d) is directed away from the center of the circle

56) A 2 N ball falls from a height of 0.8 m. Neglecting airresistance, about how fast is it traveling the instantbefore it hits the ground?

(a) 2 m/s

(b) 4 m/s

(c) 10 m/s

(d) 12 m/s

57) As a pulse travels along a rope, the pulse loses energyand its amplitude

(a) decreases (c) remains the same

(b) increases

58) A roller coaster with mass m dives down a hill withheight h and has velocity v at the bottom of the hill.When does the roller coaster have the most total en-ergy?

(a) At the top of the hill.

(b) Halfway down the hill.

(c) At the bottom of the hill.

(d) The roller coaster always has the same total en-ergy.

59) Compared to wavelengths of visible light, the wave-lengths of ultraviolet light are

(a) shorter (c) the same

(b) longer

For question 60

An interference pattern is produced on screen B when light passes through the double slit in barrier A.

60) The pattern produced on the screen is the result ofinterference and

(a) reflection (c) diffraction

(b) refraction (d) polarization

61) In the diagram below, A, B, C, and D are points neara current-carrying solenoid.

Which point is closest to the north pole of thesolenoid?

(a) A (c) C

(b) B (d) D

62) Which toy car has the GREATEST momentum?

4 kg

v=0.5 m/s

2 kg

v=2 m/s

3 kg

v=1 m/s

D)

C)

B)

A)

1 kg

v=3 m/s

(a) A

(b) B

(c) C

(d) D

63) A lamp and an ammeter are connected to a source asshown.

What is the electrical energy expended in the lamp in3.0 seconds?

(a) 50 J (c) 50 W

(b) 150 J (d) 150 W

64) In the circuit shown below, what is the potential dif-ference of the source?

(a) 3.3 V (c) 30 V

(b) 10 V (d) 1,000 V

65) As the period of a wave decreases, the wave’s fre-quency

(a) decreases (c) remains the same

(b) increases

66) In the diagram below, electron current is passedthrough a solenoid. The north pole of the solenoidis nearest to point

(a) A (c) C

(b) B (d) D

67) What is the current in ammeter A in the diagram be-low?

(a) 1 A (c) 3 A

(b) 13 A (d) 9 A

For question 68

A 9 volt battery supplies a voltage to 3 identical lightbulbs in the circuit shown.

9 V Battery

A) B)

C)

68) What would happen if lightbulb C burned out?

(a) Lightbulbs A and B would glow brighter.

(b) Lightbulbs A and B would glow dimmer.

(c) Lightbulbs A and B would not change.

(d) Lightbulbs A and B would turn off.

For question 69

A 9 volt battery supplies a voltage to 3 identical lightbulbs in the circuit shown.

9 V Battery

A)

B)

C)

69) What would happen to the power dissipation of thecircuit if one of the lightbulbs burned out?

(a) It would increase.

(b) It would decrease.

(c) It would stay the same.

(d) It would be zero.

70) When a 5-kilogram mass is lifted from the ground to aheight of 10 meters, the gravitational potential energyof the mass is increased by approximately

(a) 0.5 J (c) 50 J

(b) 2 J (d) 500 J

71) What is the wavelength of X-rays with a frequency1.5× 1018 hertz traveling in a vacuum?

(a) 4.5× 1026 m (c) 5.0× 10−10 m

(b) 2.0× 10−10 m (d) 5.0× 109 m

72) A girl rides an escalator that moves her upward at con-stant speed. As the girl rises, how do her gravitationalpotential energy and kinetic energy change?

(a) Gravitational potential energy decreases and ki-netic energy decreases.

(b) Gravitational potential energy decreases and ki-netic energy remains the same.

(c) Gravitational potential energy increases and ki-netic energy decreases.

(d) Gravitational potential energy increases and ki-netic energy remains the same.

73) In the diagram below, a 100-kilogram clown is firedfrom a 500.-kilogram cannon.

If the clown’s speed is 15 meters per second after thefiring, then the recoil speed (v) of the cannon is

(a) 75 m/s (c) 3.0 m/s

(b) 15 m/s (d) 0 m/s

74) Which is an example of a longitudinal wave?

(a) gamma ray (c) sound wave

(b) X-ray (d) water wave

75) Changing magnetic fields produce−

(a) electric fields.

(b) magnetic fields.

(c) charged particles.

(d) magnetic forces.

76) Wave motion in a medium transfers

(a) energy, only

(b) mass, only

(c) both mass and energy

(d) neither mass nor energy

CST Practice Physics ExamYoung

Answer Key

Long Answer Questions

1) 2.5 x 109 Hz

Multiple Choice Questions

2) b3) a4) c5) c6) d7) c8) c9) b10) c11) a12) d13) d14) b15) c16) a17) b18) a19) d20) c21) d22) d23) d24) b25) c26) d27) c28) a29) c30) a31) c32) b33) b34) d35) a36) c37) d38) d39) d40) b41) b42) d43) d44) b45) c

46) a47) d48) c49) b50) b51) d52) b53) b54) a55) c56) b57) a58) d59) a60) c61) c62) b63) b64) c65) b66) a67) c68) c69) b70) d71) b72) d73) c74) c75) a76) a