# 3. Physics Practice Questions - Ch. 17-21

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http://www.austincc.edu/mmcgraw/files_1405/Review%2017-21.pdf

### A

3) Evaporation is a cooling process and condensation is
A) a warming process.
B) a cooling process also.
C) neither a warming nor cooling process.

### C

4) Evaporation is a cooling process because
A) heat is radiated during the process.
B) of conduction and convection.
C) the more energetic molecules are able to escape the
liquid.
D) the temperature of the remaining liquid decreases.
E) none of these

### C

7) Steam burns are more damaging than burns caused
by boiling water because steam
A) gives up additional energy when it condenses.
B) has more energy per kilogram than boiling water.
C) Choices A and B are both correct.
D) Choices B and C are both incorrect.

### C

8) We feel uncomfortably warm on a muggy day
because water molecules are
A) evaporating from our moist bodies.
B) condensing on our bodies.
C) evaporating and condensing on our bodies at the
same rate.

### A

10) When a gas is changed to a liquid state, the gas
A) releases energy.
B) absorbs energy.
C) neither releases nor absorbs energy.
D) both releases and absorbs energy.

### B

11) When a solid is changed to a liquid state, the solid
A) releases energy.
B) absorbs energy.
C) neither releases nor absorbs energy.
D) both releases and absorbs energy.

### B

12) When liquids change to a solid state, they
A) absorb energy.
B) release energy.
C) neither absorb nor release energy.
D) both absorb and release energy.

### C

14) When heat is added to boiling water, its
temperature
A) increases.
B) decreases.
C) does not change.

### C

15) Boiling water does not increase in temperature
when additional heat is applied because
A) the temperature doesn't change in a change of state.
B) added input energy doesn't increase the water's
internal energy.
C) the increased heating produces increased boiling,
and therefore increased cooling.
D) none of these

### B

16) For increased atmospheric pressure, the boiling
temperature of a liquid
A) goes down.
B) goes up.
C) remains at 100 degrees C.

### A

29) When bringing water to a boil in the mountains, the
time needed to reach the boiling point is
A) less than at sea level.
B) more than at sea level.
Review 17-21.doc - 2 -
C) the same as at sea level.

### A

30) Food in a pressure cooker is cooked faster because
of the
A) higher temperature.
B) greater rate of bubble formation in the water.
C) increased internal energy in the water.
D) Choices A, B, and C are all true.
E)

### D

39) On a humid day, water condenses on the outside of
a glass of ice water. This phenomenon occurs mainly
because of
A) the porosity of glass.
B) capillary action.
C) adhesion of water molecules to glass.
D) the saturation of cooled air.
E) evaporation.

### A

5) The greater the difference in temperature between
the input reservoir and the output reservoir for a heat
engine, the
A) greater the efficiency.
B) less the efficiency.
C) Neitherıefficiency of a heat engine doesn't depend
on temperature difference.

### D

6) The first law of thermodynamics is a restatement of
the
A) principle of entropy.
C) Carnot cycle.
D) conservation of energy.
E) none of these

### B

8) Systems that are left alone, tend to move toward a
state of
A) less entropy.
B) more entropy.
C) no entropy.

### E

16) When an ideal gas is subjected to an adiabatic
process
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) Choices A, B, and C are all true.
E) None of the above choices are true.

### C

17) During an adiabatic compression of an ideal gas,
A) the internal energy of the gas remains constant.
B) the temperature of the gas does not change.
C) no heat is supplied to or removed from the gas.
D) no work is done on the gas.
E) None of the above choices are true.

### B

18) A process which takes place at constant
temperature is
B) an isothermal process.
C) impossible.

### B

19) A quantity of water has more entropy when it is
A) frozen ice.
B) boiling.
C) at room temperature.

### D

24) A heat engine would have 100 percent efficiency if
its input reservoir were
A) 100 times hotter than the exhaust sink.
B) 1000 times hotter than the exhaust sink.
C) 100 times cooler than the exhaust sink.
D) any finite temperature if the exhaust sink were at
absolute zero.
E) at any finite temperature regardless of the heat sink
temperature.

### B

30) When a volume of air expands against the
environment and no heat enters or leaves, the air
temperature will
A) increase.
B) decrease.
C) remain unchanged.

### A

36) If you run a refrigerator in a closed room with the
refrigerator door open, the room temperature will
A) increase.
B) decrease.
C) remain unchanged.

### A

1) A wiggle in time is a
A) vibration.
B) wave.
C) both
D) neither

### C

2) A common source of wave motion is a
A) wave pattern.
B) harmonic object.
C) vibrating object.
D) region of variable high and low pressure.
E) none of these

### A

4) In a longitudinal wave the compressions and
rarefactions travel in
A) the same direction.
B) opposite directions.
C) a vacuum.

### A

5) Which of the following is not a transverse wave?
A) sound
B) light
D) all of these
E) none of these

### A

11) If the frequency of a certain wave is 10 hertz, its
period is
A) 0.1 second.
B) 10 seconds.
C) 100 seconds.
D) None of the above choices are correct.

### A

13) An object that completes 10 vibrations in 20
seconds has a frequency of
A) 0.5 hertz.
B) 2 hertz.
C) 200 hertz.

### D

17) To say that one wave is out of phase with another
is to say that the waves are
A) of different amplitudes.
B) of different frequencies.
C) of different wavelengths.
D) out of step.
E) all of these

### D

18) Wave interference occurs for
A) sound waves.
B) light waves.
C) water waves.
D) All of the above choices are correct.
E) None of the above choices are correct.

### B

19) A standing wave occurs when
A) two waves overlap.
Review 17-21.doc - 4 -
B) a wave reflects upon itself.
C) the speed of the wave is zero or near zero.
D) the amplitude of a wave exceeds its wavelength.

### C

30) The pendulum with the greatest frequency is the
pendulum with the
A) shortest period.
B) shortest length.
C) shortest period and the shortest length.
D) shortest amplitude.
E) greatest amplitude.

### B

32) If the waves are going by at the same frequency,
the wave that has the greatest speed will have the
greatest
A) amplitude.
B) length.
C) frequency.
D) None of the above choices are true.

### C

41) Some of a wave's energy dissipates as heat. In time,
this will reduce the wave's
A) speed.
B) wavelength.
C) amplitude.
D) frequency.
E) period.

### B

43) When a pendulum clock at sea level is taken to the
top of a high mountain, it will
A) gain time.
B) lose time.
C) neither gain nor lose time.

### A

1) The source of every sound is something that is
A) vibrating.
B) moving.
C) accelerating.
D) undergoing simple harmonic motion.
E) a net emitter of energy.

### C

2) A sound source of high frequency emits a high
A) speed.
B) amplitude.
C) pitch.
D) all of these
E) none of these

### A

3) Double the frequency of a sound and you halve its
A) wavelength.
B) speed.
C) amplitude.
D) all of these
E) none of these

### B

5) The approximate range of human hearing is
A) 10 hertz to 10,000 hertz.
B) 20 hertz to 20,000 hertz.
C) 40 hertz to 40,000 hertz.
D) Actually all of theseıdepends on the hearing ability
of the person.

### A

7) A sound wave is a
A) longitudinal wave.
B) transverse wave.
C) standing wave.
D) shock wave.
E) None of the above choices are correct.

### A

8) Compressions and rarefactions are characteristic of
A) longitudinal waves.
B) transverse waves.
C) both longitudinal and transverse waves.
D) Neither of the above choices are correct.

### C

10) Sound travels faster in
A) air.
B) water.
C) steel.
D) a vacuum.
E) Sound travels at about the same speed in all of the
above media.

### D

11) Sound waves cannot travel in
A) air.
B) water.
C) steel.
D) a vacuum.
E) any of the above media

### A

13) Sound travels faster in air if the air temperature is
A) warm.
B) cold.
C) average.

### A

21) The energy of sound in air eventually becomes
A) increased internal energy of the air.
B) weaker and weaker until it disappears.
C) cancelled by destructive interference.
D) cancelled by both destructive and constructive
interference.

### B

28) The least energy required to produce forced
vibration in an object occurs
A) below its natural frequency.
B) at its natural frequency.
C) above its natural frequency.

### E

30) In designing a music hall, an acoustical engineer
deals mainly with
A) modulation.
B) forced vibrations.
C) resonance.
D) beats.
E) wave interference.

### C

32) The phenomenon of beats results from sound
A) refraction.
B) reflection.
C) interference.
D) all of these
E) none of these

### A

40) A 340-hertz sound wave travels at 340 m/s in air
with a wavelength of
A) 1 m.
B) 10 m.
C) 100 m.
D) 1000 m.
E) None of the above choices are correct.

### B

41) When the handle of a tuning fork is held solidly
against a table, the sound becomes louder and the time
that the fork keeps vibrating
A) becomes longer.
B) becomes shorter.
C) remains the same.

### A

42) Resonance can be looked at as forced vibration
with the
A) least amount of energy input.
B) maximum amount of energy input.
C) matching of wave amplitudes.
D) matching of constructive and destructive
interference.
E) minimum beat frequency.

### C

43) In which one of these media does sound travel the
fastest?
A) water vapor
B) water
C) ice
D) steam
E) Sound travels the same speed in each of the above
media.

### E

45) An explosion occurs 34 km away. Since sound
travels at 340 m/s, the time it takes for the sound to
reach you is
A) 0.1 second.
B) 1 second.
C) 10 seconds.
D) 20 seconds.
E) more than 20 seconds.

### A

46) The beat frequency produced when a 240 hertz
tuning fork and a 246 hertz tuning fork are sounded
together is
A) 6 hertz.
B) 12 hertz.
C) 240 hertz.
D) 245 hertz.
E) None of the above choices are correct.

### B

52) A neon atom has a larger atomic number than a
helium atom. At the same temperature and pressure,
how does the speed of sound in helium gas compare to
the speed of sound in neon gas?
A) greater in neon than in helium
B) greater in helium than in neon
C) the same in both gases
D) depends on the frequency of the sound generated

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