Question 1

A cake of soap is placed in a bathtub sink. The buoyant force on the soap is

Accepted Answer

A)   0.
B)   less than its weight.
C)   equal to its weight.
D)   more than its weight.E) A) and B)
F) A) and C)

Question 2

An absolute temperature of 100 K is the same as a Celsius temperature of

Accepted Answer

A)   -173 °\degree° C.
B)   32 °\degree° C.
C)   212 °\degree° C.
D)   373 °\degree° C. E) C) and D)
F) A) and D)

Question 3

Heat transfer by convection occurs

Accepted Answer

A)   only in liquids.
B)   only in gases.
C)   only in liquids and gases.
D)   in liquids, gases, and solids.E) A) and B)
F) All of the above

Question 4

The properties of several different materials are being compared. If the samples all have the same volume, the one with the greatest mass also has the greatest

Accepted Answer

A)   density.
B)   buoyancy.
C)   pressure.
D)   temperature.E) A) and B)
F) A) and C)

Question 5

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) All of the above
F) B) and D)

Question 6

The specific heat of ice is 2.1 kJ/kg °\degree° C. When 50 kJ of heat is removed from 2 kg of ice initially at -5 °\degree° C, the final temperature of the ice is

Accepted Answer

A)   -6 °\degree° C.
B)   -11 °\degree° C.
C)   -12 °\degree° C.
D)   -17 °\degree° C. E) A) and B)
F) B) and C)

Question 7

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

Accepted Answer

A)   water.
B)   ice.
C)   concrete.
D)   gold.E) A) and D)
F) A) and C)

Question 8

In order to double the average energy of the molecules in a gas at 200 K, its temperature must be changed to

Accepted Answer

A)   100 K.
B)   400 K.
C)   800 K.
D)   1600 K.E) A) and B)
F) C) and D)

Question 9

The maximum possible efficiency of a heat engine

Accepted Answer

A)   is 100%.
B)   depends on the intake temperature.
C)   depends on the difference between the exhaust and intake temperatures.
D)   depends on the ratio between the exhaust and intake temperatures.E) A) and C)
F) C) and D)

Question 10

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 B) C

Question 11

When a gas is forced into a smaller volume without a change in temperature, its pressure increases because its molecules

Accepted Answer

A)   strike the container walls more often.
B)   strike the container walls at higher speeds.
C)   strike the container walls with greater force.
D)   have more energy.E) A) and C)
F) A) and B)

Question 12

In order for an object to sink when placed in water, the object's average density must be

Accepted Answer

A)   less than that of water.
B)   equal to that of water.
C)   more than that of water.
D)   Any of these choices are correct, depending on the object's shape.E) B) and C)
F) All of the above

Question 13

The density of air is 1.3 kg/m3. The air in a room 5 m long, 4 m wide, and 2.5 m high has a mass of

Accepted Answer

A)   0.26 kg.
B)   6.5 kg.
C)   38 kg.
D)   65 kg.E) None of the above
F) A) and B)

Question 14

A thermometer calibrated in the Celsius scale and a thermometer calibrated in the Fahrenheit scale are used to measure the same temperature. The numerical reading on the Fahrenheit thermometer

Accepted Answer

A)   is proportional to that on the Celsius thermometer.
B)   is smaller than that on the Celsius thermometer.
C)   is larger than that on the Celsius thermometer.
D)   may be smaller or larger than that on the Celsius thermometer.E) A) and B)
F) B) and C)

Question 15

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

Accepted Answer

A)   at rest.
B)   as close together as possible
C)   moving in the same direction
D)   moving with the same average speedE) A) and D)
F) A) and C)

Question 16

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) A) and B)
F) C) and D) A

Question 17

At which of the following Celsius temperatures will a Fahrenheit thermometer show the same reading in degrees?

Accepted Answer

A)   -40 °\degree° C
B)   0 °\degree° C
C)   32 °\degree° C
D)   40 °\degree° C E) B) and C)
F) A) and B) A

Question 18

If it is to be 40 percent efficient, a heat engine that exhausts heat at 350 K must absorb heat at a minimum temperature of

Accepted Answer

A)   210 K.
B)   583 K.
C)   875 K.
D)   1038 K.E) A) and B)
F) B) and C)

Question 19

A heat engine absorbs heat at 127 °\degree° C and exhausts heat at 77 °\degree° C. Its maximum efficiency is

Accepted Answer

A)   13 percent.
B)   39 percent.
C)   61 percent.
D)   88 percent. E) None of the above
F) A) and D)

Question 20

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 C)
F) B) and D)

Exam 5: Matter and Heat

A cake of soap is placed in a bathtub sink. The buoyant force on the soap is

Correct AnswerverifiedShow Answer

An absolute temperature of 100 K is the same as a Celsius temperature of

Correct AnswerverifiedShow Answer

Heat transfer by convection occurs

Correct AnswerverifiedShow Answer

The properties of several different materials are being compared. If the samples all have the same volume, the one with the greatest mass also has the greatest

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The specific heat of ice is 2.1 kJ/kg °\degree° C. When 50 kJ of heat is removed from 2 kg of ice initially at -5 °\degree° C, the final temperature of the ice is

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In order to double the average energy of the molecules in a gas at 200 K, its temperature must be changed to

Correct AnswerverifiedShow Answer

The maximum possible efficiency of a heat engine

Correct AnswerverifiedShow Answer

Of the following, a molecule is best described as

Correct AnswerverifiedC

When a gas is forced into a smaller volume without a change in temperature, its pressure increases because its molecules

Correct AnswerverifiedShow Answer

In order for an object to sink when placed in water, the object's average density must be

Correct AnswerverifiedShow Answer

The density of air is 1.3 kg/m3. The air in a room 5 m long, 4 m wide, and 2.5 m high has a mass of

Correct AnswerverifiedShow Answer

A thermometer calibrated in the Celsius scale and a thermometer calibrated in the Fahrenheit scale are used to measure the same temperature. The numerical reading on the Fahrenheit thermometer

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedA

At which of the following Celsius temperatures will a Fahrenheit thermometer show the same reading in degrees?

Correct AnswerverifiedA

If it is to be 40 percent efficient, a heat engine that exhausts heat at 350 K must absorb heat at a minimum temperature of

Correct AnswerverifiedShow Answer

A heat engine absorbs heat at 127 °\degree° C and exhausts heat at 77 °\degree° C. Its maximum efficiency is

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

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The specific heat of ice is 2.1 kJ/kg $\degree$ C. When 50 kJ of heat is removed from 2 kg of ice initially at -5 $\degree$ C, the final temperature of the ice is

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C

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The density of air is 1.3 kg/m³. The air in a room 5 m long, 4 m wide, and 2.5 m high has a mass of

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A

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A

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A heat engine absorbs heat at 127 $\degree$ C and exhausts heat at 77 $\degree$ C. Its maximum efficiency is

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