Question 1

When a liquid becomes a vapor,

Accepted Answer

A)  its temperature must decrease.
B)  its temperature must increase.
C)  it must absorb heat.
D)  it must give off heat.E) All of the above
F) None of the above

Question 2

A 400-kg concrete block is 1 m long, 0.6 m wide, and 0.3 m high.Its density is

Accepted Answer

A)  72 kg/m.
B)  222 kg/m.
C)  667 kg/m.
D)  2222 kg/m.E) A) and B)
F) None of the above

Question 3

The physics of a heat engine cannot be used to understand the operation of a

Accepted Answer

A)  nuclear reactor.
B)  heat pump.
C)  refrigerator.
D)  diesel engine.E) A) and B)
F) A) and C)

Question 4

Of the following, a molecule is best described as

Accepted Answer

A)  any very tiny particle.
B)  the smallest particle found in nature.
C)  the smallest particle of a substance that is representative of the substance.
D)  the ultimate particle of which all matter is composed.E) None of the above
F) A) and C)

Question 5

Of the substances below, the one with the highest specific heat is

Accepted Answer

A)  water.
B)  ice.
C)  concrete.
D)  gold.E) None of the above
F) B) and C)

Question 6

The average pressure of the atmosphere at sea level corresponds to which one or more of the following?

Accepted Answer

A)  101 Pa
B)  101 kPa
C)  98 kPa
D)  15 lb/in2
E)  Both B and DF) A) and B)
G) C) and E)

Question 7

The pressure on the bottom of an object inside a liquid is

Accepted Answer

A)  less than the pressure on its top.
B)  equal to the pressure on its top.
C)  more than the pressure on its top.
D)  Any of these choices, depending on the nature of the liquid.E) A) and B)
F) B) and C)

Question 8

Heat transfer in a vacuum

Accepted Answer

A)  can take place only by radiation.
B)  can take place only by radiation and convection.
C)  can take place by radiation, convection, and conduction.
D)  cannot take place.E) C) and D)
F) All of the above

Question 9

The "heat death" of the universe refers to a possible future in which all of its molecules are

Accepted Answer

A)  at rest.
B)  as close together as possible.
C)  all moving with the same average speed.
D)  all moving in the same direction.E) A) and D)
F) All of the above

Question 10

The specific heat of water is 4.2 kJ/kg ∘\circ∘ C.The heat needed to warm 8 kg of water from 20 ∘\circ∘ C to 70 ∘\circ∘ C is

Accepted Answer

A)  400 kJ.
B)  420 kJ.
C)  1680 kJ.
D)  2016 kJ. E) B) and C)
F) None of the above

Question 11

A container holds 1 g of air at atmospheric pressure.When an additional gram of air is pumped into the container and there is no change in temperature, the new pressure is

Accepted Answer

A)  0.5 atm.
B)  1 atm.
C)  2 atm.
D)  4 atm.E) A) and B)
F) B) and C)

Question 12

When a liquid freezes to become a solid,

Accepted Answer

A)  its temperature rises.
B)  its temperature falls.
C)  it absorbs heat.
D)  it gives off heat.E) None of the above
F) All of the above

Question 13

When 90 kJ is removed from a 2-kg copper bar, its temperature drops from 200 ∘\circ∘ C to 85 ∘\circ∘ C.The specific heat of copper is

Accepted Answer

A)  0.16 kJ/kg ∘\circ∘ C.
B)  0.19 kJ/kg ∘\circ∘ C.
C)  0.23 kJ/kg ∘\circ∘ C.
D)  0.39 kJ/kg ∘\circ∘ C. E) B) and D)
F) None of the above

Question 14

A Celsius thermometer and an absolute thermometer are used to measure the temperature of the same gas sample.The readings on the thermometers are respectively TC and TK.Which is correct?

Accepted Answer

A)  TC is smaller than TK.
B)  TC is larger than TK.
C)  TC is equal to TK.
D)  Any of these choices could be correct, depending on the gas temperature.E) A) and B)
F) A) and C)

Question 15

The freezing point of a substance is always lower than its

Accepted Answer

A)  melting point.
B)  boiling point.
C)  heat of fusion.
D)  heat of vaporization.E) A) and B)
F) A) and C)

Question 16

Which of the following quantities is independent of the size and shape of an object composed of a given material?

Accepted Answer

A)  volume
B)  mass
C)  weight
D)  densityE) None of the above
F) A) and D)

Question 17

Suppose there were molecules that had no attraction whatsoever for one another.A collection of such molecules would form a

Accepted Answer

A)  gas.
B)  liquid.
C)  amorphous solid.
D)  crystalline solid.E) C) and D)
F) All of the above

Question 18

The entropy of a body of matter is a measure of

Accepted Answer

A)  how cold it is.
B)  how disordered its molecules are.
C)  how many of its molecules are at rest.
D)  the average kinetic energy of its molecules.E) C) and D)
F) B) and D)

Question 19

Molecules are, in general, farthest apart from one another in

Accepted Answer

A)  gases.
B)  liquids.
C)  crystalline solids.
D)  amorphous solids.E) A) and D)
F) A) and C)

Question 20

Ice floats in water because

Accepted Answer

A)  its density is less than that of water.
B)  its specific heat is less than that of water.
C)  it is a solid whereas water is a liquid.
D)  it is colder than water.E) A) and B)
F) B) and C)

Exam 5: Matter and Heat

Molecules are, in general, farthest apart from one another in

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Suppose there were molecules that had no attraction whatsoever for one another.A collection of such molecules would form a

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The "heat death" of the universe refers to a possible future in which all of its molecules are

Correct AnswerverifiedShow Answer

The entropy of a body of matter is a measure of

Correct AnswerverifiedShow Answer

The average pressure of the atmosphere at sea level corresponds to which one or more of the following?

Correct AnswerverifiedShow Answer

Which of the following quantities is independent of the size and shape of an object composed of a given material?

Correct AnswerverifiedShow Answer

A 400-kg concrete block is 1 m long, 0.6 m wide, and 0.3 m high.Its density is

Correct AnswerverifiedShow Answer

Of the substances below, the one with the highest specific heat is

Correct AnswerverifiedShow Answer

The physics of a heat engine cannot be used to understand the operation of a

Correct AnswerverifiedShow Answer

A container holds 1 g of air at atmospheric pressure.When an additional gram of air is pumped into the container and there is no change in temperature, the new pressure is

Correct AnswerverifiedShow Answer

The pressure on the bottom of an object inside a liquid is

Correct AnswerverifiedShow Answer

Heat transfer in a vacuum

Correct AnswerverifiedShow Answer

A Celsius thermometer and an absolute thermometer are used to measure the temperature of the same gas sample.The readings on the thermometers are respectively TC and TK.Which is correct?

Correct AnswerverifiedShow Answer

Of the following, a molecule is best described as

Correct AnswerverifiedShow Answer

The freezing point of a substance is always lower than its

Correct AnswerverifiedShow Answer

Ice floats in water because

Correct AnswerverifiedShow Answer

When a liquid becomes a vapor,

Correct AnswerverifiedShow Answer

The specific heat of water is 4.2 kJ/kg ∘\circ∘ C.The heat needed to warm 8 kg of water from 20 ∘\circ∘ C to 70 ∘\circ∘ C is

Correct AnswerverifiedShow Answer

When a liquid freezes to become a solid,

Correct AnswerverifiedShow Answer

When 90 kJ is removed from a 2-kg copper bar, its temperature drops from 200 ∘\circ∘ C to 85 ∘\circ∘ C.The specific heat of copper is

Correct AnswerverifiedShow Answer

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A Celsius thermometer and an absolute thermometer are used to measure the temperature of the same gas sample.The readings on the thermometers are respectively T_C and T_K.Which is correct?

Correct Answer
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The specific heat of water is 4.2 kJ/kg^$\circ$C.The heat needed to warm 8 kg of water from 20^$\circ$C to 70^$\circ$C is

Correct Answer
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Correct Answer
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When 90 kJ is removed from a 2-kg copper bar, its temperature drops from 200^$\circ$C to 85^$\circ$C.The specific heat of copper is

Correct Answer
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