Question 1

Refer to the first image: An ice cube is floating in a glass of water. After the ice melts, what happens to the water level in the glass?

Accepted Answer

The water level remains the same.

Question 2

Refer to the second image: A rock is placed on top of an ice cube floating in water. After the ice melts, what happens to the water level?

Accepted Answer

The water level decreases.

Question 3

Why is atmospheric pressure lower in the mountains?

Accepted Answer

Mountain air has less air above it to support.

Question 4

Is it possible to stand on the roof of a five-story (50 foot) tall house and drink, using a straw, from a glass on the ground?

Accepted Answer

No

Question 5

What is the maximum height to which water can be drunk through a straw, based on atmospheric pressure?

Accepted Answer

Is 10.3 m

Question 6

Why don't barometers use water instead of mercury?

Accepted Answer

Water can be used but the barometer will be too tall.

Question 7

A piston in an airtight pump is withdrawn so that the volume of the air chamber is increased 3 times. What is the change in pressure?

Accepted Answer

The pressure is 1/3 the original pressure.

Question 8

As a balloon rises higher and higher into the atmosphere, its

Accepted Answer

None of the above.

Question 9

Why does a hot air balloon float in cold air?

Accepted Answer

Because the density of the hot air inside the balloon is less than the cold air outside, creating buoyant force.

Question 10

Why does a helium balloon float in air?

Accepted Answer

Because helium is less dense than air, so the buoyant force lifts the balloon.

Question 11

A blood platelet drifts along with the flow of blood through an artery that is partially blocked by deposits. As the platelet moves from the narrow region to the wider region, its speed

Accepted Answer

Decreases.

Question 12

A blood platelet drifts along with the flow of blood through an artery that is partially blocked by deposits. As the platelet moves from the narrow region to the wider region, it experiences

Accepted Answer

An increase in pressure.

Question 13

On a windy day, waves in a lake or the ocean are higher than their average height. What factor in Bernoulli's principle contributes to the increased height?

Accepted Answer

Reduced pressure pulls water upward.

Question 14

The pressure in a stream of water is reduced as the stream speeds up. Can a stream of water from a fire hose actually knock a person off his or her feet?

Accepted Answer

It can, and is consistent with Bernoulli’s principle.

Question 15

There is twice as much molecular kinetic energy in 2 liters of boiling water as in 1 liter of boiling water. Which will be the same for both?

Accepted Answer

Temperature.

Question 16

The same quantity of heat is added to different amounts of water in two equal-size containers. The temperature of the smaller amount of water

Accepted Answer

Increases more.

Question 17

You heat a half-cup of tea and its temperature rises by $$4^\circ \mathrm{C}. $$How much will the temperature rise if you add the same amount of heat to a full cup of tea?

Accepted Answer

$$2^\circ \mathrm{C}$$

Question 18

Which has the higher specific heat capacity, water or land?

Accepted Answer

Water

Question 19

As you heat a block of aluminum from $$0^\circ \mathrm{C} to$$ $$100^\circ \mathrm{C}$$, its density

Accepted Answer

Decreases

Question 20

When a sample of $$0^\circ \mathrm{C}$$ water is heated, it first

Accepted Answer

Contracts

Physics Exam #3 Practice Test – Fluid Mechanics & Thermodynamics Guidance

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