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# Classical Physics Practice Test

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By McGraw-Hill Professional
Updated on Sep 5, 2011

## Classical Physics Practice Test

A good score is at least 37 correct. Answers are given at the end. It is best to have a friend check your score the first time so that you won’t memorize the answers if you want to take the test again.

1. The joule is equivalent to

(a) a newton-meter.

(b) a kilogram-meter.

(c) a watt.

(d) a candela.

(e) an erg.

2. The acceleration vector of the Earth in its orbit around the Sun points

(a) straight out away from the Sun.

(b) in the same direction as the instantaneous motion of the Earth.

(c) straight inward toward the Sun.

(d) at a right angle to the plane of the Earth’s orbit around the Sun.

(e) nowhere; it is the zero vector.

3. Which of the following is not expressible as a vector quantity?

(a) Displacement

(b) Velocity

(c) Acceleration

(d) Mass

(e) Force

4. A car travels 200 km in 3 hours (3.00 hr). What is its average speed?

(a) 18.5 m/s

(b) 0.0540 m/s

(c) 54.0 m/s

(d) 66.7 m/s

(e) It can’t be calculated based on this information.

5. What is the difference between a chemical reaction and an atomic reaction?

(a) A chemical reaction involves fission or fusion of nuclei, but an atomic reaction does not.

(b) An atomic reaction involves fission or fusion of nuclei, but a chemical reaction does not.

(c) An atomic reaction requires antimatter, but a chemical reaction does not.

(d) A chemical reaction requires an atomic reaction to set it off.

(e) There is no difference; chemical and atomic reactions are exactly the same thing.

6. What is the distinction between mass and weight?

(a) Nothing. They are different names for the same thing.

(b) Weight is the force produced by gravity on an object having mass.

(c) Mass is the force produced by gravity on an object having weight.

(d) Mass depends on the speed of an object, but weight does not.

(e) Mass is an expression of the resistance of an object to movement, but weight is an expression of the number of atoms in an object.

7. A highly malleable substance

(a) can be pounded into thin sheets.

(b) evaporates at a low temperature.

(c) changes state directly from solid to gaseous.

(d) does not melt when heated but burns instead.

(e) is extremely brittle.

8. Suppose that an object has a mass of 540 g and is lifted 25.5 m. How much potential energy will it attain? Take the value of the magnitude of Earth’s gravitational acceleration to be 9.81 m/s 2 .

(a) 0.208 J

(b) 135 J

(c) 208 J

(d) 463 J

(e) 1.35 × 10 5 J

9. Which of the following two types of particles have roughly the same mass?

(a) A proton and an electron

(b) A neutron and an electron

(c) A proton and a neutron

(d) A proton and a helium nucleus

(e) A neutron and a helium nucleus

10. The newton is a unit of

(a) mass.

(b) frequency.

(c) gravitational acceleration.

(d) temperature.

(e) None of the above.

11. There are 1.806 × 10 24 atoms in a sample of liquid measuring 100.0 ml in volume. What is the mass density of this sample?

(a) 1.806 × 10 28 mol/cm 3

(b) 1.806 × 10 28 g/cm 3

(c) 0.03000 mol/cm 3

(d) 0.003000 mol/cm 3

(e) It cannot be calculated from the information given.

12. How long does it take a ray of light to travel 3.00 × 10 6 km through free space?

(a) 100 s

(b) 10.0 s

(c) 1.00 s

(d) 0.100 s

(e) 0.0100 s

13. Pascal’s law involves the behavior of

(a) confined incompressible liquids.

(b) objects in gravitational fields.

(c) substances that are cooled to extremely low temperatures.

(d) substances when they change from one phase of matter to another.

(e) molecules in a vacuum.

14. An example of diffusion is illustrated by

(a) the way molasses is less “runny” than water.

(b) the way liquid dye gradually disperses in a glass of water without stirring or shaking.

(c) the way water in a lake freezes at the surface but not underneath.

(d) the way a liquid develops a flat surface in an environment where there is gravity.

(e) any of the above.

15. Approximately how many kilometers are there between the Earth’s north geographic pole and the equator, as measured in a great circle over the surface?

(a) 10 million km

(b) 1 million km

(c) 100,000 km

(d) 10,000 km

(e) 1,000 km

16. A spherical ball bearing has a radius of 0.765 cm. The mass of this ball bearing is 25.5 g. What is the density?

(a) 7.12 g/cm 3

(b) 33.3 g/cm 3

(c) 57.0 g/cm 3

(d) 13.6 g/cm 3

(e) It cannot be calculated from this information.

17. The acceleration of a moving object has a constant magnitude of a = 3.00 m/s 2 . The object starts out from a dead stop at t = 0.00 s and moves in a straight-line path. How far will it have traveled from its starting point at t = 5.00 s?

(a) 0.120 m

(b) 7.50 m

(c) 15.0 m

(d) 37.5 m

(e) It can’t be calculated from this information.

18. In an ideal system,

(a) there is no heat.

(b) there is no mass.

(c) there is no friction.

(d) all the objects move at the same speed.

(e) all the objects move in the same direction.

19. The rate at which energy is expended can be defined in terms of

(a) joules.

(b) newton-meters.

(c) newtons per meter.

(d) kilogram-meters.

(e) joules per second.

20. An object whose mass is 2.00 kg is lifted upward a distance of 3.55 m against the pull of gravity on a planet where the gravitational acceleration is 5.70 m/s 2 . How much work is done?

(a) 40.5 kg · m 2 /s 2

(b) 7.10kg · m 2 /s 2

(c) 11.4 kg · m 2 /s 2

(d) 1.25 kg · m 2 /s 2

(e) It cannot be calculated from this information.

21. Specific heat can be expressed in

(a) calories per second.

(b) kilocalories per hour.

(c) Btus per hour.

(d) calories per gram.

(e) calories per gram per degree Celsius.

22. The momentum vector of a moving object is directly affected by all the following except

(a) the speed of the object.

(b) the velocity of the object.

(c) the mass of the object.

(d) the direction in which the object moves.

(e) the temperature of the object.

23. Suppose that a rod measuring 1.00 m long of a certain metal has a thermal coefficient of linear expansion of 3.32 × 10 −5 /°C. If the rod is heated from 10 to 20°C, how much longer will the rod become?

(a) 0.0000332 m

(b) 0.000332 m

(c) 0.00332 m

(d) 0.032 m

(e) No! The rod will not lengthen. It will shorten.

24. You are told that a sample of matter masses 365 μg. How much is this in kilograms?

(a) 3.65 × 10 5

(b) 36.5

(c) 0.365

(d) 3.65 × 10 −7

(e) It depends on the intensity of the gravitational field in which the mass is measured.

25. Nuclear physicists commonly use particle accelerators to

(a) weigh heavy objects such as boulders.

(b) determine the masses of distant stars and galaxies.

(c) fabricate elements that don’t occur naturally.

(d) evacuate all the air from an enclosure.

(e) generate powerful beams of light.

26. The Einstein equation E = mc 2 might be applied directly to calculate

(a) the energy produced by a matter-antimatter reaction.

(b) the energy produced by the electrolysis of water.

(c) the energy produced when oxygen and iron react to form rust.

(d) the mass produced when two atoms of hydrogen and one atom of oxygen combine to form a molecule of water.

(e) the mass of the chlorine liberated by the electrolysis of salt water.

27. The velocity of gravity at the surface of the Earth is

(a) approximately 9.8 m.

(b) approximately 9.8 m/s.

(c) approximately 9.8 m/s.

(d) approximately 9.8 m/s.

(e) none of the above; the expression “velocity of gravity” is meaningless.

28. Suppose that a certain substance melts and freezes at +200°C. Imagine a block of this material whose mass is 500 g, and it is entirely solid at +200°C. It is subjected to heating, and it melts. Suppose that it takes 50,000 cal of energy to melt the substance entirely into liquid at +200°C. What is the heat of fusion for this material?

(a) It cannot be determined from this information.

(b) 0.100 cal/g

(c) 1.00 cal/g

(d) 10.0 cal/g

(e) 100 cal/g

29. The term heat of vaporization refers to

(a) the amount of heat necessary to convert a certain amount of liquid matter to the gaseous state.

(b) the amount of heat necessary to convert a certain amount of solid matter to the liquid state.

(c) the heat produced when a substance vaporizes.

(d) the heat absorbed by a substance when it liquefies.

(e) a device used for vaporizing water.

30. The base International Unit of visible-light brightness is the

(a) lumen.

(b) lux.

(c) candela.

(d) joule.

(e) watt.

31. What is a fundamental difference between speed and velocity?

(a) Velocity depends on gravitation, but speed does not.

(b) Velocity depends on mass, but speed does not.

(c) Velocity depends on force, but speed does not.

(d) Velocity depends on direction, but speed does not.

(e) There is no difference; speed and velocity are exactly the same thing.

32. Potential energy can be defined in terms of

(a) newton-meters.

(b) meters per second squared.

(c) kilograms per second.

(d) kilograms per meter.

(e) kilogram-meters.

33. A car whose mass is 900 kg travels east along a highway at 50.0 km/h. What is the magnitude of the momentum vector of this car?

(a) 450 kg · m/s

(b) 1.25 × 10 4 kg · m/s

(c) 4.50 × 10 6 kg · m/s

(d) 2.25 × 10 6 kg · m/s

(e) 6.48 × 10 4 kg · m/s

34. Refer to test question 28. What is the heat of vaporization for this material?

(a) It cannot be determined from this information.

(b) 0.100 cal/g

(c) 1.00 cal/g

(d) 10.0 cal/g

(e) 100 cal/g

35. A marble massing 1.5 g and a large brick massing 5.5 kg are dropped from the same height on the moon. Which object will strike the surface of the moon with greater force?

(a) The marble; it concentrates its mass in a smaller volume.

(b) The brick; it has greater mass and is “pulled down” with greater force.

(c) Neither; they will strike with the same amount of force.

(d) This is a meaningless question because it involves units that don’t agree.

36. The Rankine scale

(a) is the same as the centigrade scale.

(b) has degrees that are the same size as centigrade degrees, but the zero point is different.

(c) has degrees that are the same size as Fahrenheit degrees, but the zero point is different.

(d) is commonly used by laypeople in European countries.

(e) is preferred when talking about extremely high temperatures.

37. Which of the following statements is not always true?

(a) Acceleration is a quantitative representation of the change in velocity of a moving object.

(b) The acceleration vector of a moving object always points in the same direction as the velocity vector.

(c) The instantaneous velocity of a moving object can change even if the direction remains constant.

(d) The instantaneous velocity of a moving object can change even if the speed remains constant.

(e) Speed is a scalar quantity.

38. If an electron is stripped from an electrically neutral atom, the result is

(a) a different isotope of the same element.

(b) a different element altogether.

(c) a nuclear reaction.

(d) a change in the atomic number.

(e) none of the above.

39. A room becomes warmer by 10 K. How much warmer has it become in degrees Fahrenheit?

(a) 18°F

(b) 5.6°F

(c) 10°F

(d) 273.15°F

(e) It cannot be calculated from this information.

40. The atomic mass of an element is approximately equal to

(a) the sum of the number of protons and neutrons in the nucleus.

(b) the number of protons in the nucleus.

(c) the number of neutrons in the nucleus.

(d) the sum of the number of protons and electrons.

(e) the sum of the number of neutrons and electrons.

41. A typical carbon atom has six neutrons and six protons in its nucleus. If one of the protons is taken out of the nucleus somehow but no other aspect of the atom is changed, which of the following best describes the new atom?

(a) It will be a different isotope of carbon.

(b) It will be a negative carbon ion.

(c) It will be a positive carbon ion.

(d) It will be an atom of a different element.

(e) None of the above.

42. Suppose that there is an airtight chamber that can be enlarged and reduced in size. The chamber is located in a laboratory on the Earth’s surface. The chamber contains N moles of oxygen molecules. The volume of the chamber is reduced rapidly without adding or removing any molecules. All the following things will happen except

(a) the temperature of the oxygen will go down.

(b) the mass density of the oxygen will increase.

(c) the oxygen will exert increased pressure on the walls of the chamber.

(d) the particle density of the oxygen will increase.

(e) the weight density of the oxygen will increase.

43. Heat is an expression of

(b) energy convection.

(c) energy conduction.

(d) energy transfer.

(e) kinetic energy.

44. Energy and mass are intimately and absolutely related, according to Albert Einstein’s hypothesis, by

(a) gravitation.

(b) the rate of energy transfer.

(c) the rate of mass transfer.

(d) the speed of light squared.

(e) the intensity of acceleration.

45. Suppose that a motor is used to drive a mechanical system. The motor draws 500 W from the power source that runs it, and the mechanical power produced by the system is 400 W. What is the efficiency of this system, expressed as a ratio?

(a) 0.800

(b) 1.25

(c) 80.0

(d) 125

(e) It cannot be calculated from this information.

46. A sample of matter is placed on a table. It retains its shape. Based only on this information, we can be certain that this material is

(a) a gas.

(b) a liquid.

(c) a solid.

(d) frozen.

(e) less dense than the table.

47. The unit of force in the International System is the

(a) gram.

(b) dyne.

(c) pound.

(d) kilogram.

(e) newton.

48. A positron is the same thing as

(a) a proton.

(b) an antiproton.

(c) an electron.

(d) an antielectron.

(e) nothing; there is no such thing as a positron.

49. Fill in the blanks so that the following sentence is true: “A substance that appears as a liquid with low viscosity in one_____can appear to be a liquid with high viscosity, even at the same temperature and pressure, when observed in another_____.

(a) gravitational field

(b) container

(c) quantity

(d) time sense

(e) state of matter

50. The megahertz (MHz) is a unit of

(a) mass.

(b) time.

(c) speed.

(d) quantity.

(e) none of the above.

1. a

2. c

3. d

4. a

5. b

6. b

7. a

8. b

9. c

10. e

11. e

12. b

13. a

14. b

15. d

16. d

17. d

18. c

19. e

20. a

21. e

22. e

23. b

24. d

25. c

26. a

27. e

28. e

29. a

30. c

31. d

32. a

33. b

34. a

35. b

36. c

37. b

38. e

39. a

40. a

41. d

42. a

43. d

44. d

45. a

46. c

47. e

48. d

49. d

50. e

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