Question 1

If you were caught in freezing weather with only a candle for heat, you would be warmer in

Accepted Answer

A)   a tent.
B)   a wooden house.
C)   an igloo.
D)   a car.E) All of the above
F) A) and B)

Question 2

Boiling water does not increase in temperature when additional heat is applied because

Accepted Answer

A)   added input energy doesn't increase the water's internal energy.
B)   the temperature doesn't change in a change of state.
C)   the increased heating produces increased boiling, and therefore increased cooling.
D)   none of theseE) A) and C)
F) A) and B)

Question 3

Which involves the larger number of calories?

Accepted Answer

A)   the condensation of 1 gram of steam at 100 degrees Celsius to water at 100 degrees
B)   the cooling of 1 gram of water at 100 degrees Celsius to 1 gram of ice at absolute zero
C)   Both involve the same number of calories.
D)   Neither involves calories.E) B) and C)
F) A) and D)

Question 4

An object will normally be a net radiator of energy when its temperature is

Accepted Answer

A)   lower than its surroundings.
B)   higher than its surroundings.
C)   neither of theseD) A) and C)
E) A) and B)

Question 5

To turn 50 grams of boiling water to steam requires

Accepted Answer

A)   540 calories.
B)   50 calories.
C)   500 calories
D)   more calories than are required to bring 50 grams of ice at absolute zero to the boiling point.
E)   None of the above choices are correct.F) None of the above
G) A) and B)

Question 6

When snow forms in clouds, the surrounding air

Accepted Answer

A)   cools.
B)   warms.
C)   neither warms nor cools.D) None of the above
E) All of the above

Question 7

An inventor discovers a harmless and tasteless salt, which, when added to water changes its boiling point. The market value for this salt will be best if the salt

Accepted Answer

A)   lowers the boiling point of water.
B)   raises the boiling point of water.
C)   either raises or lowers the boiling point, as the food would be cooked either way.D) B) and C)
E) All of the above

Question 8

Cold water will warm to room temperature faster in a

Accepted Answer

A)   black pot.
B)   silver pot.
C)   depends more on the size of the pots than their colorD) A) and C)
E) All of the above

Question 9

Warm air rises because faster-moving molecules tend to move to regions of less

Accepted Answer

A)   density and less pressure.
B)   pressure.
C)   density.D) B) and C)
E) All of the above

Question 10

When water vapor condenses on the inside of a window, the room becomes slightly

Accepted Answer

A)   cooler.
B)   warmer.
C)   neither warmer nor cooler.D) None of the above
E) A) and C)

Question 11

Increased air pressure on the surface of hot water tends to

Accepted Answer

A)   prevent boiling .
B)   promote boiling.
C)   Neither choice A nor choice B is true.
D)   Choice A and choice B are both true.E) B) and C)
F) A) and D)

Question 12

When heat is added to boiling water, its temperature

Accepted Answer

A)   increases.
B)   decreases.
C)   does not change.D) A) and B)
E) A) and C)

Question 13

Waves emitted by the sun and terrestrial wave emissions are

Accepted Answer

A)   the same except for their frequencies and wavelengths.
B)   entirely different kinds of waves.
C)   identical.D) A) and B)
E) A) and C)

Question 14

To increase the temperature of 50 grams of water by 2 Celsius degrees requires

Accepted Answer

A)   0.04 calorie.
B)   25 calories.
C)   100 calories.
D)   2 calories.
E)   4.18 calories.F) C) and E)
G) B) and D)

Question 15

If molecules in a gas sample moved so they completely missed each other, the gas's temperature would

Accepted Answer

A)   decrease.
B)   increase.
C)   stay the same.D) B) and C)
E) None of the above

Question 16

Wrapping a hot potato in aluminum foil significantly reduces the rate at which it cools by

Accepted Answer

A)   conduction.
B)   evaporation.
C)   condensation.
D)   melting.E) A) and B)
F) A) and C)

Question 17

The planet Earth loses heat mainly by

Accepted Answer

A)   conduction.
B)   radiation.
C)   convection.
D)   all of theseE) A) and B)
F) C) and D)

Question 18

Stored potatoes, beets, and rutabagas in a well-insulated but unheated room can be protected from freezing by having in the room

Accepted Answer

A)   large tubs of water.
B)   large blocks of salt.
C)   large rocks.
D)   large blocks of foam plastic.
E)   large cubes of sugar.F) B) and E)
G) B) and D)

Question 19

A water-filled paper cup held in a flame will not catch fire. This is because

Accepted Answer

A)   water is an excellent conductor of heat.
B)   the inside of the paper is wet.
C)   paper is a poor conductor of heat.
D)   the paper cup cannot become appreciably hotter than the water it contains.E) A) and C)
F) B) and C)

Question 20

A hot dog pants

Accepted Answer

A)   to bring more oxygen into its lungs.
B)   for no particular reason - some things just happen.
C)   to impress dogs of the opposite sex.
D)   to help evaporation occur in its mouth and bronchial tract.E) C) and D)
F) A) and D)

Exam 9: Heat Transfer and Change of Phase

Increased air pressure on the surface of hot water tends to

Correct AnswerverifiedShow Answer

An object will normally be a net radiator of energy when its temperature is

Correct AnswerverifiedShow Answer

When heat is added to boiling water, its temperature

Correct AnswerverifiedShow Answer

Warm air rises because faster-moving molecules tend to move to regions of less

Correct AnswerverifiedShow Answer

An inventor discovers a harmless and tasteless salt, which, when added to water changes its boiling point. The market value for this salt will be best if the salt

Correct AnswerverifiedShow Answer

Which involves the larger number of calories?

Correct AnswerverifiedShow Answer

When water vapor condenses on the inside of a window, the room becomes slightly

Correct AnswerverifiedShow Answer

The planet Earth loses heat mainly by

Correct AnswerverifiedShow Answer

Cold water will warm to room temperature faster in a

Correct AnswerverifiedShow Answer

Waves emitted by the sun and terrestrial wave emissions are

Correct AnswerverifiedShow Answer

Stored potatoes, beets, and rutabagas in a well-insulated but unheated room can be protected from freezing by having in the room

Correct AnswerverifiedShow Answer

When snow forms in clouds, the surrounding air

Correct AnswerverifiedShow Answer

To turn 50 grams of boiling water to steam requires

Correct AnswerverifiedShow Answer

If you were caught in freezing weather with only a candle for heat, you would be warmer in

Correct AnswerverifiedShow Answer

A water-filled paper cup held in a flame will not catch fire. This is because

Correct AnswerverifiedShow Answer

A hot dog pants

Correct AnswerverifiedShow Answer

Boiling water does not increase in temperature when additional heat is applied because

Correct AnswerverifiedShow Answer

If molecules in a gas sample moved so they completely missed each other, the gas's temperature would

Correct AnswerverifiedShow Answer

To increase the temperature of 50 grams of water by 2 Celsius degrees requires

Correct AnswerverifiedShow Answer

Wrapping a hot potato in aluminum foil significantly reduces the rate at which it cools by

Correct AnswerverifiedShow Answer

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