Chapter 16 PHYSICS

35) The pupil of your eye is a net A) absorber of radiant energy. B) emitter of radiant energy. C) reflector of radiant energy. D) none of the above

A) absorber of radiant energy.

14) If you were caught in freezing weather with only a candle for heat, you would be warmer in A) an igloo. B) a tent. C) a wooden house. D) a car.

A) an igloo.

41) A liter of hot water will cool to room temperature faster in a A) black pot. B) silver pot. C) red pot. D) none of the above

A) black pot.

24) A region of expanding air tends to A) cool. B) warm. C) both of the these D) neither of these

A) cool.

39) If a pizza radiates more energy than it absorbs, its temperature A) decreases. B) is unaffected. C) increases. D) none of the above

A) decreases.

44) The temperature of outer space is A) zero. B) about 2.7 kelvin. C) meaningless. D) none of the above

B) about 2.7 kelvin.

15) In terms of transferring heat, red-hot wooden coals A) conduct quite well. B) conduct poorly. C) radiate poorly. D) convect poorly.

B) conduct poorly.

18) Soaring birds and glider pilots can remain aloft for hours without expending power, due to A) conduction. B) convection. C) radiation. D) all of the above

B) convection.

20) If a volume of air is warmed, it expands and tends to A) warm. B) cool. C) neither of these

B) cool.

2) A good heat conductor is A) a poor insulator. B) a good insulator. C) neither of these

A) a poor insulator.

37) Objects that radiate relatively well A) absorb radiation relatively well. B) reflect radiation relatively well. C) both of these D) neither of these

A) absorb radiation

42) A liter of cold water will warm faster in sunlight in a A) black pot. B) silver pot. C) red pot. D) none of the above

A) black pot.

49) Both black and white road surfaces absorb sunlight. The warmer road surface at the end of a sunny day is the A) black surface. B) white surface. C) neither of these

A) black surface.

12) If air were a better conductor, at nighttime Earth would be A) considerably colder. B) considerably warmer. C) not appreciably different in temperature.

A) considerably colder.

34) Terrestrial radiation is A) emitted by Earth. B) emitted by the Sun. C) both of these D) neither of these

A) emitted by Earth.

30) If you release a single molecule in an evacuated region it will initially A) fall just as a baseball would. B) move in any direction. C) convect upward. D) be buoyed upward. E) none of the above

A) fall just as a baseball would.

46) A good absorber of radiation is a A) good emitter of radiation. B) poor emitter of radiation. C) good reflector. D) none of the above

A) good emitter of radiation.

28) In a mixture of hydrogen gas, oxygen gas, and nitrogen gas, the molecules with the greatest average speed are those of A) hydrogen. B) oxygen. C) nitrogen. D) all the same

A) hydrogen.

21) When a volume of air is compressed, air temperature A) increases. B) decreases. C) neither of these

A) increases.

38) When an object absorbs as much as it radiates A) it remains at about the same temperature. B) it is a net absorber. C) it is a net radiator. D) none of the above

A) it remains at about the same temperature.

48) If a poor absorber of radiation were a good emitter, its temperature would be A) less than its surroundings. B) more than its surroundings. C) the same as its surroundings.

A) less than its surroundings.

27) At the same temperature, which has greater average speed in the air? A) very light molecules B) heavier molecules C) both have equal average speeds.

A) very light molecules

19) You can safely hold your fingers on both sides of a candle flame due mainly to A) conduction. B) convection. C) radiation. D) none of the above

B) convection.

6) On a cold day your feet feel warmer on a rug than on a tile floor because a rug A) is usually warmer than tile. B) is a poorer conductor. C) for the same mass has more internal energy than tile. D) all of the above E) none of the above

B) is a poorer conductor.

1) Metals are good conductors of both heat and electricity due to A) similar thermal and electrical conductive properties. B) looseness of outer electrons in metal atoms. C) relatively high densities of metals. D) high elasticity of metals. E) both transferring energy easily.

B) looseness of outer

16) The reason you can walk barefoot on red-hot coals of wood without burning your feet mainly involves A) low temperature of the coals. B) low conductivity of the coals. C) mind over matter techniques.

B) low conductivity of the coals.

23) Molecules in a region of expanding air more often collide with neighboring molecules that are A) approaching. B) receding. C) nearly out of range.

B) receding.

33) The higher the temperature of an object, the A) longer the wavelengths it radiates. B) shorter the wavelengths it radiates. C) makes no difference in the wavelengths it radiates

B) shorter the wavelengths it radiates.

8) In practice, a good insulator A) stops heat flow. B) slows heat flow. C) speeds negative heat flow. D) all of the above

B) slows heat flow.

32) Sun's radiant energy is composed of shorter wavelengths than Earth's due to Sun's greater A) size. B) surface temperature. C) both of these D) neither of these

B) surface temperature.

50) Both black and white road surfaces radiate energy. At midnight on a starry night the warmer road surface is the A) black surface. B) white surface. C) neither, as no noticeable difference.

B) white surface.

9) When you touch a nail stuck in ice, energy flows from A) the ice to your hand. B) your hand to the ice. C) both of these D) neither of these

B) your hand to the ice.

7) A block of wood and a block of copper will feel neither hot nor cold to the touch when they each have A) equal temperatures. B) your temperature. C) equal conductivities. D) none of the above

B) your temperature.

29) If no molecular collisions occurred in a sample of gas, temperature of the gas would A) increase. B) decrease. C) be unaffected.

C) be unaffected.

5) Because of trapped air inside, snow is a A) good conductor. B) good insulator. C) both a good insulator and a poor conductor. D) none of the above

C) both a good insulator and a poor conductor.

22) Blow on your hand with your mouth open. Then do the same with your lips puckered and you'll find A) a difference in temperatures. B) the breath from puckered lips is cooler. C) both of these D) neither of these

C) both of these

25) Steam that issues from a pressure cooker A) is invisible. B) cools as it expands. C) both of these D) neither of these

C) both of these

36) The lower the temperature of an object, the A) lower the frequency of radiation it emits. B) longer the wavelengths it radiates. C) both of these D) neither of these

C) both of these

26) A parcel of warmed air rises due to A) random molecular motion. B) radiation. C) buoyancy. D) increased energy of its molecules.

C) buoyancy.

43) A bridge is more likely to be ice covered than the roadway on a cold day because A) a bridge is more conducting than ground. B) a bridge is more commonly wet than ground. C) heat upwelling from the ground below is absent on a bridge. D) none of the above

C) heat upwelling from the ground below is absent on a bridge.

40) If a pizza absorbs more energy than it emits, its temperature A) decreases. B) is unaffected. C) increases. D) none of the above

C) increases.

47) A good reflector of radiation is a A) good absorber of radiation. B) good emitter of radiation. C) poor absorber of radiation. D) none of the above

C) poor absorber of radiation.

31) The form of heat transfer that doesn't depend on a medium is A) conduction. B) convection. C) radiation. D) all of the above

C) radiation.

45) A photovoltaic cell receives energy input by A) conduction. B) convection. C) radiation. D) all of the above

C) radiation.

10) Wood is a poor conductor A) when it is cold. B) at common room temperature. C) when it is hot. D) all of the above E) none of the above

D) all of the above

11) A bare roof on a warmly heated home on a snowy day indicates A) an unwanted flow of heat B) poor insulation. C) fairly good conductivity. D) all of the above

D) all of the above

4) Which of these are good insulators? A) feathers. B) wood. C) snow. D) all the above E) none of the above

D) all the above

17) Energy transfer by convection is primarily restricted to A) solids. B) liquids. C) gases. D) fluids. E) none of the above

D) fluids.

13) A water-filled paper cup held in a flame will not catch fire. This is because A) the inside of the paper is wet. B) water is an excellent conductor of heat. C) paper is a poor conductor of heat. D) the paper cup cannot become appreciably hotter than the water it contains.

D) the paper cup cannot become appreciably hotter than the water it contains.

3) Which of these are good conductors? A) feathers. B) wood. C) snow. D) all the above E) none of the above

E) none of the above