Question 1

As a high-altitude balloon sinks lower into the atmosphere, it undergoes a decrease in

Accepted Answer

A) volume. 
B) density. 
C) weight. 
D) mass. 
E) none of the above 
A) volume. 
B) density. 
C) weight. 
D) mass. 
E) none of the above A

Question 2

Most of the mass of material that makes up a plasma is

Accepted Answer

A) electrically neutral. 
B) always positively charged. 
C) always negatively charged. 
A) electrically neutral. 
B) always positively charged. 
C) always negatively charged. A

Question 3

At normal atmospheric pressure and temperature, 1 cubic meter of air has a mass of about

Accepted Answer

A) 1.00 kg. 
B) 1.25 kg. 
C) 2.00 kg. 
D) 2.25 kg. 
A) 1.00 kg. 
B) 1.25 kg. 
C) 2.00 kg. 
D) 2.25 kg. B

Question 4

The buoyant force on a one-ton blimp hovering in air is

Accepted Answer

A) zero. 
B) one ton. 
C) less than one ton. 
D) more than one ton. 
A) zero. 
B) one ton. 
C) less than one ton. 
D) more than one ton.

Question 5

If you stand on a weighing scale and suddenly the atmosphere vanishes, taking buoyancy into account, the scale reading

Accepted Answer

A) increases. 
B) decreases. 
C) remains the same. 
D) quickly reduces to zero. 
A) increases. 
B) decreases. 
C) remains the same. 
D) quickly reduces to zero.

Question 6

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

Accepted Answer

A) increases. 
B) decreases. 
C) increases, then decreases. 
D) decreases, then increases. 
E) remains the same. 
A) increases. 
B) decreases. 
C) increases, then decreases. 
D) decreases, then increases. 
E) remains the same.

Question 7

A common 5-liter metal can will float in air if it is

Accepted Answer

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! 
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!

Question 8

An umbrella tends to move upwards on a windy day principally because

Accepted Answer

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 
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

Question 9

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

Accepted Answer

A) volumes. 
B) densities. 
C) weights. 
D) viscosity. 
E) none of the above 
A) volumes. 
B) densities. 
C) weights. 
D) viscosity. 
E) none of the above

Question 10

The main difference between gases and plasmas has to do with

Accepted Answer

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. 
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.

Question 11

As a high-altitude balloon rises higher into the atmosphere, it undergoes a decrease in

Accepted Answer

A) volume. 
B) density. 
C) weight. 
D) mass. 
E) none of the above 
A) volume. 
B) density. 
C) weight. 
D) mass. 
E) none of the above

Question 12

As a balloon high in the atmosphere descends, it undergoes a decrease in

Accepted Answer

A) volume. 
B) density. 
C) weight. 
D) mass. 
E) none of the above 
A) volume. 
B) density. 
C) weight. 
D) mass. 
E) none of the above

Question 13

The Bernoulli effect causes passing ships to be drawn together when the ships are close and moving in

Accepted Answer

A) the same direction. 
B) opposite directions. 
C) either of these 
A) the same direction. 
B) opposite directions. 
C) either of these

Question 14

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

Accepted Answer

A) half as much. 
B) the same. 
C) twice as much. 
D) none of the above 
A) half as much. 
B) the same. 
C) twice as much. 
D) none of the above

Question 15

Which is an example of matter in a plasma phase?

Accepted Answer

A) dry ice 
B) a torch flame 
C) molten lava 
D) liquid hydrogen 
E) none of the above 
A) dry ice 
B) a torch flame 
C) molten lava 
D) liquid hydrogen 
E) none of the above

Question 16

About what percentage of molecules in the air make up the atmosphere below a 6-kilometer altitude?

Accepted Answer

A) 20% 
B) 30% 
C) 40% 
D) 50% 
E) more than 50% 
A) 20% 
B) 30% 
C) 40% 
D) 50% 
E) more than 50%

Question 17

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

Accepted Answer

A) considerably less. 
B) considerably more. 
C) the same. 
A) considerably less. 
B) considerably more. 
C) the same.

Question 18

Airplane flight best illustrates

Accepted Answer

A) Archimedes' principle. 
B) Pascal's principle. 
C) Bernoulli's principle. 
D) Boyle's law. 
A) Archimedes' principle. 
B) Pascal's principle. 
C) Bernoulli's principle. 
D) Boyle's law.

Question 19

A bubble of air released from the bottom of a lake

Accepted Answer

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 
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

Question 20

Most of the matter in the universe is in the

Accepted Answer

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

Exam 14: Gases and Plasmas

As a high-altitude balloon sinks lower into the atmosphere, it undergoes a decrease in

Most of the mass of material that makes up a plasma is

At normal atmospheric pressure and temperature, 1 cubic meter of air has a mass of about

The buoyant force on a one-ton blimp hovering in air is

If you stand on a weighing scale and suddenly the atmosphere vanishes, taking buoyancy into account, the scale reading

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 common 5-liter metal can will float in air if it is

An umbrella tends to move upwards on a windy day principally because

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

The main difference between gases and plasmas has to do with

As a high-altitude balloon rises higher into the atmosphere, it undergoes a decrease in

As a balloon high in the atmosphere descends, it undergoes a decrease in

The Bernoulli effect causes passing ships to be drawn together when the ships are close and moving in

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

Which is an example of matter in a plasma phase?

About what percentage of molecules in the air make up the atmosphere below a 6-kilometer altitude?

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

Airplane flight best illustrates

A bubble of air released from the bottom of a lake

Most of the matter in the universe is in the

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