Question 1

To minimize heat loss it is best that a teapot be

Accepted Answer

A)  black.
B)  silver.
C)  depends on size, not color.D) A) and C)
E) All of the above

Question 2

The silver coating on the glass surfaces of a Thermos bottle reduces energy that is transferred by

Accepted Answer

A)  conduction.
B)  convection.
C)  radiation.
D)  friction.
E)  none of the aboveF) A) and E)
G) C) and D)

Question 3

In a gaseous mixture of hydrogen and oxygen, the slower molecules on average are

Accepted Answer

A)  hydrogen.
B)  oxygen.
C)  both the same.
D)  not enough informationE) C) and D)
F) B) and D)

Question 4

Newton's law of cooling applies to objects that are

Accepted Answer

A)  cooling.
B)  warming.
C)  both
D)  none of the aboveE) A) and B)
F) All of the above C

Question 5

A good reflector of radiation is a

Accepted Answer

A)  good absorber of radiation.
B)  good emitter of radiation.
C)  poor absorber of radiation.
D)  none of the aboveE) A) and D)
F) None of the above

Question 6

Food is cooked faster in a pressure cooker because of the

Accepted Answer

A)  higher temperature.
B)  greater rate of bubble formation in the water.
C)  increased thermal energy in the water.
D)  none of the aboveE) A) and B)
F) B) and D)

Question 7

The average frequency of radiant energy is directly proportional to the

Accepted Answer

A)  Celsius temperature of the emitter.
B)  Fahrenheit temperature of the emitter.
C)  kelvin temperature of the emitter.
D)  all of the above
E)  none of the aboveF) A) and E)
G) A) and C)

Question 8

The dew that forms on a cold soda can when taken from a refrigerator is due to

Accepted Answer

A)  evaporation.
B)  condensation.
C)  sublimation.
D)  none of the aboveE) All of the above
F) A) and D)

Question 9

If the greenhouse effect on Earth were absent, Earth's average temperature would be about

Accepted Answer

A)  -18°C.
B)  appreciably warmer.
C)  as it is now.D) B) and C)
E) A) and C)

Question 10

If an object radiates more energy than it reflects, its

Accepted Answer

A)  thermal energy decreases.
B)  temperature decreases.
C)  both
D)  neitherE) All of the above
F) None of the above

Question 11

Consider a steaming aluminum soda-pop can that contains a small amount of boiling water. When it is quickly inverted into a bath of cooler water, the can is dramatically crushed. This is due to the rapidly reduced pressure inside the can by

Accepted Answer

A)  contact with the relatively cool water.
B)  sudden slowing of the air and steam molecules inside.
C)  condensation of steam inside.
D)  reduced thermal energy.
E)  rapid conduction of heat to the relatively cool water.F) All of the above
G) None of the above

Question 12

When ice changes phase to become water, energy is

Accepted Answer

A)  absorbed.
B)  released.
C)  unchanged.D) A) and B)
E) None of the above

Question 13

Which emits the highest frequency of radiation?

Accepted Answer

A)  a red-hot star
B)  the Sun
C)  a blue-hot star
D)  all the sameE) None of the above
F) A) and C)

Question 14

Hot steam that issues from a pressure cooker expands and

Accepted Answer

A)  increases in temperature.
B)  can cause severe burns.
C)  cools.
D)  all of the above
E)  none of the aboveF) C) and D)
G) B) and E)

Question 15

A red-hot piece of iron will cool faster in a

Accepted Answer

A)  cold room.
B)  warm room.
C)  same in each.D) A) and B)
E) All of the above

Question 16

Why is a steam burn more damaging than a burn by boiling water of the same temperature?

Accepted Answer

When steam comes in contact with the skin, condensation occurs, accompanied by a large release of energy. After the energy release (about 540 calories per gram of steam), what is left is water at the temperature of boiling. So more energy is transferred to the skin when burned with steam than with water at the same temperature.

Question 17

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

Accepted Answer

A)  higher than its surroundings.
B)  lower than its surroundings.
C)  neitherD) B) and C)
E) A) and C)

Question 18

Suppose you walk on red hot coals with bare feet. Providing bits of coal do not stick to your feet, it would be safer if your feet are

Accepted Answer

A)  wet.
B)  dry.
C)  eitherD) A) and B)
E) A) and C)

Question 19

When a gas is changed to a liquid phase, the gas

Accepted Answer

A)  releases energy.
B)  absorbs energy.
C)  neitherD) A) and B)
E) A) and C)

Question 20

When heat is added to boiling water, the water temperature

Accepted Answer

A)  increases.
B)  decreases.
C)  remains the same.D) None of the above
E) All of the above C

Exam 7: Heat Transfer and Change of Phase

To minimize heat loss it is best that a teapot be

Correct Answer
verified

The silver coating on the glass surfaces of a Thermos bottle reduces energy that is transferred by

Correct Answer
verified

In a gaseous mixture of hydrogen and oxygen, the slower molecules on average are

Correct Answer
verified

Newton's law of cooling applies to objects that are

Correct Answer
verified
C

A good reflector of radiation is a

Correct Answer
verified

Food is cooked faster in a pressure cooker because of the

Correct Answer
verified

The average frequency of radiant energy is directly proportional to the

Correct Answer
verified

The dew that forms on a cold soda can when taken from a refrigerator is due to

Correct Answer
verified

If the greenhouse effect on Earth were absent, Earth's average temperature would be about

Correct Answer
verified

If an object radiates more energy than it reflects, its

Correct Answer
verified

Consider a steaming aluminum soda-pop can that contains a small amount of boiling water. When it is quickly inverted into a bath of cooler water, the can is dramatically crushed. This is due to the rapidly reduced pressure inside the can by

Correct Answer
verified

When ice changes phase to become water, energy is

Correct Answer
verified

Which emits the highest frequency of radiation?

Correct Answer
verified

Hot steam that issues from a pressure cooker expands and

Correct Answer
verified

A red-hot piece of iron will cool faster in a

Correct Answer
verified

Why is a steam burn more damaging than a burn by boiling water of the same temperature?

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

Correct Answer
verified

Suppose you walk on red hot coals with bare feet. Providing bits of coal do not stick to your feet, it would be safer if your feet are

Correct Answer
verified

When a gas is changed to a liquid phase, the gas

Correct Answer
verified

When heat is added to boiling water, the water temperature

Correct Answer
verified
C

Exam 7: Heat Transfer and Change of Phase

To minimize heat loss it is best that a teapot be

Correct AnswerverifiedShow Answer

The silver coating on the glass surfaces of a Thermos bottle reduces energy that is transferred by

Correct AnswerverifiedShow Answer

In a gaseous mixture of hydrogen and oxygen, the slower molecules on average are

Correct AnswerverifiedShow Answer

Newton's law of cooling applies to objects that are

Correct AnswerverifiedC

A good reflector of radiation is a

Correct AnswerverifiedShow Answer

Food is cooked faster in a pressure cooker because of the

Correct AnswerverifiedShow Answer

The average frequency of radiant energy is directly proportional to the

Correct AnswerverifiedShow Answer

The dew that forms on a cold soda can when taken from a refrigerator is due to

Correct AnswerverifiedShow Answer

If the greenhouse effect on Earth were absent, Earth's average temperature would be about

Correct AnswerverifiedShow Answer

If an object radiates more energy than it reflects, its

Correct AnswerverifiedShow Answer

Consider a steaming aluminum soda-pop can that contains a small amount of boiling water. When it is quickly inverted into a bath of cooler water, the can is dramatically crushed. This is due to the rapidly reduced pressure inside the can by

Correct AnswerverifiedShow Answer

When ice changes phase to become water, energy is

Correct AnswerverifiedShow Answer

Which emits the highest frequency of radiation?

Correct AnswerverifiedShow Answer

Hot steam that issues from a pressure cooker expands and

Correct AnswerverifiedShow Answer

A red-hot piece of iron will cool faster in a

Correct AnswerverifiedShow Answer

Why is a steam burn more damaging than a burn by boiling water of the same temperature?

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

Correct AnswerverifiedShow Answer

Suppose you walk on red hot coals with bare feet. Providing bits of coal do not stick to your feet, it would be safer if your feet are

Correct AnswerverifiedShow Answer

When a gas is changed to a liquid phase, the gas

Correct AnswerverifiedShow Answer

When heat is added to boiling water, the water temperature

Correct AnswerverifiedC

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
C