Question 1

Glowing plasma is evident in the light from

Accepted Answer

A) a fluorescent lamp. 
B) the aurora borealis (northern lights). 
C) some TV screens. 
D) all the above 
E) none of the above 
A) a fluorescent lamp. 
B) the aurora borealis (northern lights). 
C) some TV screens. 
D) all the above 
E) none of the above

Question 2

Wind blowing over the top of a hill

Accepted Answer

A) increases atmospheric pressure there. 
B) decreases atmospheric pressure there. 
C) does not affect atmospheric pressure there. 
A) increases atmospheric pressure there. 
B) decreases atmospheric pressure there. 
C) does not affect atmospheric pressure there.

Question 3

Marshmallows in a vacuum become

Accepted Answer

A) larger. 
B) smaller. 
C) flat. 
D) a hollow shell. 
E) none of the above 
A) larger. 
B) smaller. 
C) flat. 
D) a hollow shell. 
E) none of the above

Question 4

A car with closed windows makes a left hand turn. A helium-filled balloon in the car moves to the

Accepted Answer

A) right. 
B) left. 
C) front. 
D) back. 
E) none of the above 
A) right. 
B) left. 
C) front. 
D) back. 
E) none of the above

Question 5

Plasmas are a central part of power generation in

Accepted Answer

A) MHD generators. 
B) turbo generators. 
C) both of these 
D) neither of these 
A) MHD generators. 
B) turbo generators. 
C) both of these 
D) neither of these

Question 6

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

Accepted Answer

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. 
B) velocity and pressure at another point. 
C) a constraint factor. 
D) none of the above

Question 7

The mass of air inside an average mid-size automobile is about

Accepted Answer

A) 0.2 kg. 
B) 2 kg. 
C) 20 kg. 
D) 200 kg. 
E) 2000 kg. 
A) 0.2 kg. 
B) 2 kg. 
C) 20 kg. 
D) 200 kg. 
E) 2000 kg.

Question 8

As a fluid gains speed, its internal pressure

Accepted Answer

A) increases. 
B) remains unchanged. 
C) decreases. 
A) increases. 
B) remains unchanged. 
C) decreases.

Question 9

When a gas is heated and becomes a plasma, its electric charge is usually

Accepted Answer

A) balanced. 
B) negative. 
C) positive. 
D) non-existent. 
E) none of these 
A) balanced. 
B) negative. 
C) positive. 
D) non-existent. 
E) none of these

Question 10

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?

Accepted Answer

A) wood 
B) iron 
C) both have the same mass. 
D) need more information 
A) wood 
B) iron 
C) both have the same mass. 
D) need more information

Question 11

Compared to the ocean, Earth's atmosphere is different in that

Accepted Answer

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 
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

Question 12

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?

Accepted Answer

A) 0.01 N 
B) 10 N 
C) 100 N 
D) 1000 N 
A) 0.01 N 
B) 10 N 
C) 100 N 
D) 1000 N

Question 13

The tarp covering on a trailer or truck puffs upward for fast-moving vehicles, which illustrates

Accepted Answer

A) Pascal's principle. 
B) Archimedes' principle. 
C) the principle of continuity. 
D) Bernoulli's principle. 
A) Pascal's principle. 
B) Archimedes' principle. 
C) the principle of continuity. 
D) Bernoulli's principle.

Question 14

Compared with air pressure on the outside, air pressure inside an inflated stretched balloon is

Accepted Answer

A) less. 
B) equal. 
C) greater. 
D) need more information 
A) less. 
B) equal. 
C) greater. 
D) need more information

Question 15

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

Accepted Answer

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. 
B) press against the ceiling. 
C) press against the floor. 
D) slowly rise. 
E) slowly fall.

Question 16

Assuming no change in temperature, as a freely expanding helium-filled balloon rises in the atmosphere, the buoyant force acting on it

Accepted Answer

A) increases. 
B) decreases. 
C) remains nearly the same. 
A) increases. 
B) decreases. 
C) remains nearly the same.

Question 17

A scuba diver losing her air supply while far beneath the water surface is advised when ascending to

Accepted Answer

A) hold air in her lungs. 
B) allow air to escape her lungs. 
C) panic. 
A) hold air in her lungs. 
B) allow air to escape her lungs. 
C) panic.

Question 18

An object in a vacuum has no

Accepted Answer

A) buoyant force. 
B) mass. 
C) weight. 
D) temperature. 
E) all of the above 
A) buoyant force. 
B) mass. 
C) weight. 
D) temperature. 
E) all of the above

Question 19

When a gas in a container is squeezed to half its volume with no change in temperature, the gas pressure

Accepted Answer

A) halves. 
B) doubles. 
C) quadruples. 
D) remains the same. 
A) halves. 
B) doubles. 
C) quadruples. 
D) remains the same.

Question 20

The Bernoulli effect causes fast-moving vans on the highway to be drawn together when

Accepted Answer

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. 
B) air between them stagnates. 
C) they experience lift. 
D) all of the above

Exam 14: Gases and Plasmas

Glowing plasma is evident in the light from

Wind blowing over the top of a hill

Marshmallows in a vacuum become

A car with closed windows makes a left hand turn. A helium-filled balloon in the car moves to the

Plasmas are a central part of power generation in

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

The mass of air inside an average mid-size automobile is about

As a fluid gains speed, its internal pressure

When a gas is heated and becomes a plasma, its electric charge is usually

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?

Compared to the ocean, Earth's atmosphere is different in that

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?

The tarp covering on a trailer or truck puffs upward for fast-moving vehicles, which illustrates

Compared with air pressure on the outside, air pressure inside an inflated stretched balloon is

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

Assuming no change in temperature, as a freely expanding helium-filled balloon rises in the atmosphere, the buoyant force acting on it

A scuba diver losing her air supply while far beneath the water surface is advised when ascending to

An object in a vacuum has no

When a gas in a container is squeezed to half its volume with no change in temperature, the gas pressure

The Bernoulli effect causes fast-moving vans on the highway to be drawn together when

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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?