Chapter 14 Test 3

14) A column that extends from sea level to the top of the atmosphere contains a certain mass of air. If the column instead contained the same mass of mercury, its height would be about A) 3/4 meter. B) 10.3 meters. C) 5.6 kilometers. D) none of the above

A) 3/4 meter.

35) The flight of a blimp best illustrates A) Archimedes' principle. B) Pascal's principle. C) Bernoulli's principle. D) Boyle's law.

A) Archimedes' principle.

75) Plasmas are a central part of power generation in A) MHD generators. B) turbo generators. C) both of these D) neither of these

A) MHD generators.

27) When boarding an airplane you bring a bag of chips. While in flight the bag puffs up, because A) air pressure in the air-tight bag is greater than cabin air pressure. B) suction is occurring. C) air pressure is affected by the Bernoulli principle. D) all the above E) none of the above

A) air pressure in the air-tight bag is greater than cabin air pressure.

65) The Bernoulli effect causes fast-moving vans on the highway to be drawn together when A) air speeds up in passing between them. B) air between them stagnates. C) they experience lift. D) all of the above

A) air speeds up in passing between them.

52) Release a ball inside a freely falling elevator and it falls directly in front of you instead of "falling to the floor," because you, ball, elevator, and enclosed air are in free fall. If you do the same with a helium-filled balloon, the balloon will A) also remain in front of you. B) press against the ceiling. C) press against the floor. D) slowly rise. E) slowly fall.

A) also remain in front of you.

77) When a gas is heated and becomes a plasma, its electric charge is usually A) balanced. B) negative. C) positive. D) non-existent. E) none of these

A) balanced.

45) An object in a vacuum has no A) buoyant force. B) mass. C) weight. D) temperature. E) all of the above

A) buoyant force.

63) A spinning tossed baseball veers off course in the direction of A) crowded streamlines. B) non-crowded streamlines. C) onward-coming streamlines.

A) crowded streamlines.

78) Most of the mass of material that makes up a plasma is A) electrically neutral. B) always positively charged. C) always negatively charged.

A) electrically neutral.

26) When a gas in a container expands to twice its volume, its density A) halves. B) doubles. C) quadruples. D) remains the same.

A) halves.

30) A scuba diver losing her air supply while far beneath the water surface is advised when ascending to A) hold air in her lungs. B) allow air to escape her lungs. C) panic.

A) hold air in her lungs.

29) While Debbie Diver holds her breath and swims deeper and deeper beneath the water's surface, her density A) increases. B) decreases. C) remains the same.

A) increases.

49) If you stand on a weighing scale and suddenly the atmosphere vanishes, taking buoyancy into account, the scale reading A) increases. B) decreases. C) remains the same. D) quickly reduces to zero.

A) increases.

19) Marshmallows in a vacuum become A) larger. B) smaller. C) flat. D) a hollow shell. E) none of the above

A) larger.

62) A spinning tossed baseball veers off course in the direction of A) reduced air pressure on the ball. B) increased air pressure on the ball. C) non-crowded streamlines.

A) reduced air pressure on the ball.

16) Consider two mercury barometers, one with twice the cross-sectional area of the other. Neglecting capillarity, compared with the wider tube, mercury in the smaller tube will rise A) to the same height. B) twice as high. C) four times as high. D) more than four times as high. E) none of the above

A) to the same height.

66) When you blow air between a pair of closely-spaced Ping-Pong balls suspended by strings, the balls will swing A) toward each other. B) away from each other. C) away from the air stream, but not necessarily toward or away from each other.

A) toward each other.

58) According to the principle of continuity, the velocity of a fluid multiplied by the cross section through which it flows at one point will equal the product of A) velocity and cross section at another point. B) velocity and pressure at another point. C) a constraint factor. D) none of the above

A) velocity and cross section at another point.

40) As a high-altitude balloon sinks lower into the atmosphere, it undergoes a decrease in A) volume. B) density. C) weight. D) mass. E) none of the above Answer: A Diff: 2 Topic: Buoyancy of Air

A) volume.

42) As a balloon high in the atmosphere descends, it undergoes a decrease in A) volume. B) density. C) weight. D) mass. E) none of the above

A) volume.

34) The buoyant force of the atmosphere on a body is equal to the A) weight of air displaced. B) volume of air displaced. C) mass of the air displaced. D) all of the above E) none of the above

A) weight of air displaced.

51) A large block of wood and a smaller block of iron on weighing scales both register 1 ton. Taking buoyancy of air into account, which has the greater mass? A) wood B) iron C) both have the same mass. D) need more information

A) wood

10) Approximately how much air is in a column 1-cm2 in cross section that extends from sea level to the top of the atmosphere? A) 1 gram B) 1 kg C) 10 kg D) 100 kg

B) 1 kg

8) At normal atmospheric pressure and temperature, 1 cubic meter of air has a mass of about A) 1.00 kg. B) 1.25 kg. C) 2.00 kg. D) 2.25 kg.

B) 1.25 kg.

11) What approximate weight of air is in a column 1-cm2 in cross section that extends from sea level to the top of the atmosphere? A) 0.01 N B) 10 N C) 100 N D) 1000 N

B) 10 N

13) About how high can water at sea level be theoretically lifted by a vacuum pump? A) less than 10.3 m B) 10.3 m C) more than 10.3 m

B) 10.3 m

32) The depth to which an inverted drinking glass must be pushed beneath the water surface to squeeze the enclosed air to half its volume is A) 76 cm. B) 10.3 m. C) 14.7 m. D) 20.6 m. E) 29.4 m.

B) 10.3 m.

15) A column that extends from sea level to the top of the atmosphere contains a certain mass of air. If the column instead contained the same mass of water, its height would be about A) 3/4 meter. B) 10.3 meters. C) 5.6 kilometers. D) none of the above

B) 10.3 meters.

22) The mass of air inside an average mid-size automobile is about A) 0.2 kg. B) 2 kg. C) 20 kg. D) 200 kg. E) 2000 kg.

B) 2 kg.

71) Which is an example of matter in a plasma phase? A) dry ice B) a torch flame C) molten lava D) liquid hydrogen E) none of the above

B) a torch flame

37) Inside the same room, buoyant force is greater on A) a helium-filled party balloon. B) an elephant. C) both the same

B) an elephant.

48) Compared to the buoyant force of the atmosphere on a 1-kilogram iron block, the buoyant force on a nearby 1-kilogram helium-filled balloon is A) considerably less. B) considerably more. C) the same.

B) considerably more.

60) Wind blowing over the top of a hill A) increases atmospheric pressure there. B) decreases atmospheric pressure there. C) does not affect atmospheric pressure there.

B) decreases atmospheric pressure there.

54) An empty jar is pushed open-side downward into water so that trapped air cannot escape. As it is pushed deeper, the buoyant force on the jar A) increases. B) decreases. C) increases, then decreases. D) decreases, then increases. E) remains the same.

B) decreases.

41) As a high-altitude balloon rises higher into the atmosphere, it undergoes a decrease in A) volume. B) density. C) weight. D) mass. E) none of the above

B) density.

24) When a gas in a container is squeezed to half its volume with no change in temperature, the gas pressure A) halves. B) doubles. C) quadruples. D) remains the same.

B) doubles.

25) When a gas in a container is squeezed to half its volume, its density A) halves. B) doubles. C) quadruples. D) remains the same.

B) doubles.

53) A car with closed windows makes a left hand turn. A helium-filled balloon in the car moves to the A) right. B) left. C) front. D) back. E) none of the above

B) left.

36) The buoyant force on a one-ton blimp hovering in air is A) zero. B) one ton. C) less than one ton. D) more than one ton.

B) one ton.

9) When a suction cup sticks to a wall it is A) pulled to the wall by the vacuum. B) pushed to the wall by the atmosphere. C) both of these D) neither of these

B) pushed to the wall by the atmosphere.

21) If one of the pair of Magdeburg hemispheres were fastened to a strong tree, the force needed by a single party to pull them apart would be A) half as much. B) the same. C) twice as much. D) none of the above

B) the same.

6) Atmospheric pressure is caused by the A) density of the atmosphere. B) weight of the atmosphere. C) temperature of the atmosphere. D) solar energy on the atmosphere.

B) weight of the atmosphere.

46) A helium-filled balloon released in the atmosphere will rise until A) the pressure inside the balloon equals atmospheric pressure. B) atmospheric pressure on the bottom and top of the balloon are equal. C) the balloon and surrounding air have equal densities. D) all of the above E) none of the above

C) the balloon and surrounding air have equal densities

47) Compared with the buoyant force of the atmosphere on a 1-liter helium-filled balloon, the buoyant force of the atmosphere on a nearby 1-liter solid iron block is A) considerably less. B) considerably more. C) the same.

C) the same.

17) Two vertical tubes of equal cross-sectional areas are filled with liquids to heights producing atmospheric pressure at their bottoms. One liquid is water and the other is mercury. Both liquids have equal A) volumes. B) densities. C) weights. D) viscosity. E) none of the above

C) weights.

4) About what percentage of molecules in the air make up the atmosphere below a 6-kilometer altitude? A) 20% B) 30% C) 40% D) 50% E) more than 50%

E) more than 50%

43) As a balloon rises higher and higher into the atmosphere its A) volume decreases. B) density increases. C) weight increases. D) mass decreases. E) none of the above

E) none of the above

59) When water is turned on in a shower, the shower curtain moves towards the water spray. This partly involves A) capillary action. B) surface tension. C) pressure changes in moving fluids. D) none of the above

C) pressure changes in moving fluids.

50) Assuming no change in temperature, as a freely expanding helium-filled balloon rises in the atmosphere, the buoyant force acting on it A) increases. B) decreases. C) remains nearly the same.

C) remains nearly the same.

12) The weight of air in a column 1-m2 in cross section that extends from sea level to the top of the atmosphere is A) 101 N. B) 10,100 N. C) 101,000 N. D) 101,000,000 N.

C) 101,000 N.

56) Airplane flight best illustrates A) Archimedes' principle. B) Pascal's principle. C) Bernoulli's principle. D) Boyle's law.

C) Bernoulli's principle.

2) Atmospheric molecules do not fly off into outer space due to A) their chaotic speeds. B) their relatively low densities. C) Earth gravitation. D) cohesive forces.

C) Earth gravitation.

76) Which of the following bodies is comprised mostly of plasma? A) Earth B) Moon C) Sun D) all of the above E) none of the above

C) Sun

67) An umbrella tends to move upwards on a windy day principally because A) trapped air under the umbrella, warms, and rises. B) buoyancy increases with increasing wind speed. C) air pressure is reduced over the curved top surface. D) all of the above

C) air pressure is reduced over the curved top surface.

7) In drinking soda or water through a straw, we make use of A) capillary action. B) surface tension. C) atmospheric pressure. D) Bernoulli's principle. E) none of the above

C) atmospheric pressure.

28) A bubble of air released from the bottom of a lake A) rises to the top at constant volume. B) becomes smaller as it rises. C) becomes larger as it rises. D) alternately expands and contracts as it rises. E) none of the above

C) becomes larger as it rises.

57) The principle of continuity states that for fluid flow to be continuous it must A) speed up in narrow regions of flow. B) slow down in wide regions of flow. C) both of these D) neither of these

C) both of these

38) A buoyant force acts on A) gas-filled balloons. B) you and your classmates. C) both of these D) neither of these

C) both of these gas-filled balloons. you and your classmates.

55) As a fluid gains speed, its internal pressure A) increases. B) remains unchanged. C) decreases.

C) decreases.

64) The Bernoulli effect causes passing ships to be drawn together when the ships are close and moving in A) the same direction. B) opposite directions. C) either of these

C) either of these

70) The main difference between gases and plasmas has to do with A) the kinds of elements involved. B) interatomic spacing. C) electrical conduction. D) fluid pressure. E) the proportion of matter to antimatter in the universe.

C) electrical conduction.

39) Compared with air pressure on the outside, air pressure inside an inflated stretched balloon is A) less. B) equal. C) greater. D) need more information

C) greater.

69) A plasma differs from a gas in that A) its molecules are farther apart. B) it is hotter than a gas. C) it is electrically conducting. D) its atoms are boosted to higher atomic numbers. E) all of the above

C) it is electrically conducting.

18) Alcohol is less dense than water. If alcohol is used to make a barometer at normal atmospheric pressure, the height of the alcohol column would be A) less than 10.3 m. B) 10.3 m. C) more than 10.3 m.

C) more than 10.3 m.

73) When a common fluorescent lamp is lit, the mercury vapor inside is actually in a A) gaseous phase. B) liquid phase. C) plasma phase. D) solid phase. E) none of the above

C) plasma phase.

20) It would be easier to pull the evacuated Magdeburg hemispheres apart if they were A) held upside down. B) at sea level. C) 20 km beneath the ocean surface. D) 20 km above the ocean surface. E) none of the above

D) 20 km above the ocean surface.

61) The tarp covering on a trailer or truck puffs upward for fast-moving vehicles, which illustrates A) Pascal's principle. B) Archimedes' principle. C) the principle of continuity. D) Bernoulli's principle.

D) Bernoulli's principle.

23) The weight of air in a bathtub (about 1/3 cubic meter) is about the same as the weight of A) a pea. B) an egg. C) a small apple. D) a pound of butter. E) a 10-pound sack of potatoes.

D) a pound of butter.

3) Compared to the ocean, Earth's atmosphere is different in that A) its density varies with depth. B) it has a less-distinct surface. C) molecules are more greatly spaced. D) all of the above E) none of the above

D) all of the above

5) The air in your classroom has A) mass. B) weight. C) energy. D) all of the above E) none of the above

D) all of the above

33) Archimedes' principle applies to A) liquids. B) gases. C) fluids. D) all of the above

D) all of the above liquids. gases. fluids

74) Glowing plasma is evident in the light from A) a fluorescent lamp. B) the aurora borealis (northern lights). C) some TV screens. D) all the above E) none of the above

D) all the above

31) A swimmer cannot snorkel more than a meter deep because air A) in the lungs cannot easily be expelled. B) tends to liquefy in the snorkel tube. C) is buoyed up leaving the swimmer breathless. D) at the surface will not freely enter the higher-pressure region in the compressed lungs. E) all of the above

D) at the surface will not freely enter the higher-pressure region in the compressed lungs.

44) A common 5-liter metal can will float in air if it is A) evacuated of air. B) filled with a very large amount of helium. C) thrown high enough. D) no way, unless the displaced air weighs more than the can and its contents!

D) no way, unless the displaced air weighs more than the can and its contents!

72) Most of the matter in our galaxy is in the A) solid phase. B) liquid phase. C) gaseous phase. D) plasma phase. E) none of the above

D) plasma phase.

A) solid phase. B) liquid phase. C) gaseous phase. D) plasma phase. E) none of the above

D) plasma phase.

1) The energy source responsible for molecular motions in Earth's atmosphere is A) their own natural kinetic energy. B) pressure caused by the weight of air. C) atmospheric tides. D) the Sun.

D) the Sun.