Chapter 18

Harry places a new air conditioner in the middle of his hot room, which when operating A. cools the room. B. further warms the room. C. neither of these

B further warms the room

When mechanical work is done on a system, an increase normally occurs in its A. internal energy. B. temperature. C. both of these D. neither of these

C. both of these

If you leave the refrigerator door open in a closed room, the room temperature will A. increase. B. decrease. C. be unaffected.

A. increase

Entropy measures temperature A. at constant pressure. B. at constant volume. C. as pressure increases. D. All of these E. None of these

E. None of these

As a parcel of air at high altitude sinks to a lower elevation with no heat input or output, its temperature A. increases. B. decreases. C. will remain unchanged.

A. increases

To totally convert a given amount of mechanical energy into heat is A. possible. B. impossible. C. need more information D. None of these

A. possible

When a system does work without adding heat, the temperature of the system A. increases. B. decreases. C. remains unchanged. D. None of these

B decreases

If a cup of tea at room temperature, 24°C is heated until it has twice the internal energy, unlike a piece of metal, its temperature will be A. 48°C. B. 100°C. C. 321°C. D. 594°C. E. None of these

B. 100 degrees C

The origin of most internal energy in Earth's interior is A. the Sun. B. radioactivity. C. volcanoes. D. None of these

B. radioactivity

Entropy is most closely related to the A. first law of thermodynamics. B. second law of thermodynamics. C. both of these D. neither of these

B. second law of thermodynamics

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. 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

C. condensation of steam inside

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

C. lower pressure on the backside of the turbine blades.

The amount of energy ultimately converted to heat by an incandescent light bulb is about A. 10%. B. 40%. C. 80%. D. 100%.

D. 100%