Question 1

When mechanical work is done on a system, an increase normally occurs in its

Accepted Answer

A) internal energy. 
B) temperature. 
C) both of these 
D) neither of these 
A) internal energy. 
B) temperature. 
C) both of these 
D) neither of these

Question 2

A soda-pop can containing only steam is placed top downward in a pan of water. Whap! The can is dramatically crushed by atmospheric pressure. The reduced pressure inside the can is due to

Accepted Answer

A) contact with the relatively cooler water. 
B) sudden slowing of the air and steam molecules inside. 
C) condensation of steam inside. 
D) reduced internal energy. 
E) rapid conduction of heat to the relatively cool water. 
A) contact with the relatively cooler water. 
B) sudden slowing of the air and steam molecules inside. 
C) condensation of steam inside. 
D) reduced internal energy. 
E) rapid conduction of heat to the relatively cool water.

Question 3

A heat engine would have 100% efficiency if its low-temperature reservoir were

Accepted Answer

A) as hot as its reservoir. 
B) at absolute zero. 
C) either of these 
D) neither of these 
A) as hot as its reservoir. 
B) at absolute zero. 
C) either of these 
D) neither of these

Question 4

When the air of a fully-inflated party balloon quickly escapes, its temperature

Accepted Answer

A) drops. 
B) rises. 
C) remains unchanged. 
D) none of the above 
A) drops. 
B) rises. 
C) remains unchanged. 
D) none of the above

Question 5

Entropy is most closely related to the

Accepted Answer

A) first law of thermodynamics. 
B) second law of thermodynamics. 
C) both of these 
D) neither of these 
A) first law of thermodynamics. 
B) second law of thermodynamics. 
C) both of these 
D) neither of these

Question 6

The most disorderly arrangement of energy within matter is also

Accepted Answer

A) the least probable state of matter. 
B) the most probable state of matter. 
C) a matter of certainties, not probabilities. 
D) none of the above 
A) the least probable state of matter. 
B) the most probable state of matter. 
C) a matter of certainties, not probabilities. 
D) none of the above

Question 7

Every heat engine

Accepted Answer

A) gains heat from a high-temperature reservoir. 
B) converts energy into mechanical work. 
C) expels heat to a lower-temperature reservoir. 
D) all of the above 
E) none of the above 
A) gains heat from a high-temperature reservoir. 
B) converts energy into mechanical work. 
C) expels heat to a lower-temperature reservoir. 
D) all of the above 
E) none of the above

Question 8

A temperature inversion occurs when the upper layers of air are

Accepted Answer

A) warmer than the lower regions of air. 
B) cooler than the lower regions of air. 
C) at the same temperature as lower regions of air. 
A) warmer than the lower regions of air. 
B) cooler than the lower regions of air. 
C) at the same temperature as lower regions of air.

Question 9

The air pressure in a container of air at 27°C will double when heated to

Accepted Answer

A) 54 degrees C. 
B) 300 degrees C. 
C) 327 degrees C. 
D) 600 degrees C. 
E) none of the above 
A) 54 degrees C. 
B) 300 degrees C. 
C) 327 degrees C. 
D) 600 degrees C. 
E) none of the above

Question 10

The ideal efficiency for a heat engine operating between the temperatures of 227°C and 27°C is

Accepted Answer

A) 20%. 
B) 25%. 
C) 40%. 
D) 88%. 
E) none of the above 
A) 20%. 
B) 25%. 
C) 40%. 
D) 88%. 
E) none of the above

Question 11

A definite method for losing weight is

Accepted Answer

A) exercise. 
B) reduce Calorie intake. 
C) maintain a low body temperature. 
D) none of the above 
A) exercise. 
B) reduce Calorie intake. 
C) maintain a low body temperature. 
D) none of the above

Question 12

Entropy is a measure of

Accepted Answer

A) messiness. 
B) disorder. 
C) both of the above 
D) none of the above 
A) messiness. 
B) disorder. 
C) both of the above 
D) none of the above

Question 13

High-quality energy in natural processes has a tendency to transform into

Accepted Answer

A) higher quality energy. 
B) lower quality energy. 
C) internal energy. 
D) entropy. 
E) none of the above 
A) higher quality energy. 
B) lower quality energy. 
C) internal energy. 
D) entropy. 
E) none of the above

Question 14

When you compress air with a tire pump, the air temperature in the tire

Accepted Answer

A) increases. 
B) decreases. 
C) remains unaffected. 
D) none of the above 
A) increases. 
B) decreases. 
C) remains unaffected. 
D) none of the above

Question 15

When an ideal gas is subjected to an adiabatic process

Accepted Answer

A) no work is done on the gas. 
B) the temperature of the gas does not change. 
C) the internal energy of the gas does not change. 
D) all of the above 
E) none of the above 
A) no work is done on the gas. 
B) the temperature of the gas does not change. 
C) the internal energy of the gas does not change. 
D) all of the above 
E) none of the above

Question 16

The greater the temperature difference between input and output reservoirs of a heat engine, the

Accepted Answer

A) greater the efficiency. 
B) smaller the efficiency. 
C) both of the above 
D) none of the above 
A) greater the efficiency. 
B) smaller the efficiency. 
C) both of the above 
D) none of the above

Question 17

The origin of most internal energy in Earth's interior is

Accepted Answer

A) the Sun. 
B) radioactivity. 
C) volcanoes. 
D) none of the above 
A) the Sun. 
B) radioactivity. 
C) volcanoes. 
D) none of the above

Question 18

Adiabatic processes occur in Earth's

Accepted Answer

A) atmosphere. 
B) oceans. 
C) mantle. 
D) all of the above 
E) none of the above 
A) atmosphere. 
B) oceans. 
C) mantle. 
D) all of the above 
E) none of the above

Question 19

When Philadelphia's temperature is 40°F and Miami's temperature is 80°F,

Accepted Answer

A) Miami is twice as hot as Philadelphia. 
B) Miami is warmer than Philadelphia. 
C) both of these 
D) neither of these 
A) Miami is twice as hot as Philadelphia. 
B) Miami is warmer than Philadelphia. 
C) both of these 
D) neither of these

Question 20

The main purpose of the condenser in the steam cycle of a steam turbine is to

Accepted Answer

A) cool the steam. 
B) condense the steam. 
C) lower pressure on the back side of the turbine blades. 
D) maintain high efficiency. 
E) change mechanical energy to electricity. 
A) cool the steam. 
B) condense the steam. 
C) lower pressure on the back side of the turbine blades. 
D) maintain high efficiency. 
E) change mechanical energy to electricity.

Exam 18: Thermodynamics

When mechanical work is done on a system, an increase normally occurs in its

A soda-pop can containing only steam is placed top downward in a pan of water. Whap! The can is dramatically crushed by atmospheric pressure. The reduced pressure inside the can is due to

A heat engine would have 100% efficiency if its low-temperature reservoir were

When the air of a fully-inflated party balloon quickly escapes, its temperature

Entropy is most closely related to the

The most disorderly arrangement of energy within matter is also

Every heat engine

A temperature inversion occurs when the upper layers of air are

The air pressure in a container of air at 27°C will double when heated to

The ideal efficiency for a heat engine operating between the temperatures of 227°C and 27°C is

A definite method for losing weight is

Entropy is a measure of

High-quality energy in natural processes has a tendency to transform into

When you compress air with a tire pump, the air temperature in the tire

When an ideal gas is subjected to an adiabatic process

The greater the temperature difference between input and output reservoirs of a heat engine, the

The origin of most internal energy in Earth's interior is

Adiabatic processes occur in Earth's

When Philadelphia's temperature is 40°F and Miami's temperature is 80°F,

The main purpose of the condenser in the steam cycle of a steam turbine is to

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