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# Density ^  Pressure ^ PowerPoint PPT Presentation

Density ^  Pressure ^. Volume decreases  Pressure ^. -- Questions --. MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

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Density ^  Pressure ^

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Density ^  Pressure ^

Volume decreases  Pressure ^

### -- Questions --

MULTIPLE CHOICE.

Choose the one alternative that best completes the statement or answers the question.

• 1) Consider two mercury barometers, one with twice the cross-sectional area of the other. Neglecting capillarity, mercury in the smaller tube will rise

• A) the same height as in the larger tube.

• B) twice as high as mercury in the larger tube.

• C) four times as high as mercury in the larger tube.

• D) more than four times as high as in the larger tube.

• E) none of these.

• 2) The depth to which an inverted drinking glass must be pushed beneath the surface of water so that the volume of enclosed air is squeezed to half is

• 76 cm.

• 10.3 m.

• 14.7 m.

• 20.6 m.

• E) 29.4 m.

• 3) As a helium-filled balloon rises in the air, it becomes

• A) more dense.

• B) heavier.

• C) bigger.

• D) all of these.

• E) none of these.

• 4) Atmospheric molecules do not fly off into outer space because of

• their relatively low densities.

• B) Earth gravitation.

• C) cohesive forces.

• D) their relatively high speeds.

• 5) Estimate the mass of air inside an average automobile.

• A) 2 grams

• B) 2 kilograms

• C) 20 kilograms

• D) 200 kilograms

• E) 2000 kilograms

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

• A) filled with a very large amount of helium.

• B) evacuated of air.

• C) thrown high enough into the air.

• D) nonsense! Unless the displaced air weighs more than the can and its contents, the can will not float in air.

• 7) A column that extends from sea level to the top of the atmosphere contains a certain mass of air. If the same column instead had the same mass of mercury in it, the height of the mercury column would be

• A) 1/13.6 times the height of the atmosphere.

• B) about 3/4 meter.

• C) 10.3 meters.

• D) about 5.6 kilometers.

• 8) The weight of a 1-square-meter column of air that extends from sea level to the top of the atmosphere is

• 10,100 N.

• 101,000 N.

• 101 N.

• D) 101,000,000 N.

• 9) It would be easier to pull evacuated Magdeburg hemispheres apart when they are

• A) held upside down.

• B) 20 km beneath the ocean surface.

• C) at sea level.

• D) 20 km above the ocean surface.

• E) none of these.

• 10) The energy source responsible for the motion of molecules that make up the atmosphere is

• A) atmospheric tides.

• B) the pressure caused by the weight of air.

• C) their own natural kinetic energy.

• D) solar power.

• 11) What is the approximate mass of a 1-square-centimeter column of air that extends from sea level to the top of the atmosphere?

• 1 gram

• 1 kilogram

• 10 kilograms

• D) 100 kilograms

• 12) A bubble of air released from the bottom of a lake

• A) rises to the top at constant volume.

• B) alternately expands and contracts as it rises.

• C) becomes larger as it rises.

• D) becomes smaller as it rises.

• E) none of these.

• 13) On a windy day, atmospheric pressure

• decreases.

• remains unchanged.

• C) increases.

• 14) Atmospheric pressure is caused by the

• A) density of the atmosphere.

• B) temperature of the atmosphere.

• C) effect of the sun's energy on the atmosphere.

• D) weight of the atmosphere.

• 15) In a vacuum, an object has no

• A) buoyant force.

• B) mass.

• C) temperature.

• D) weight.

• E) all of these.

### -- Answers --

MULTIPLE CHOICE.

The one alternative that best completes the statement or answers the question.

Chapter 14

1) Answer: A

2) Answer: B

3) Answer: C

4) Answer: B

5) Answer: B

6) Answer: D

7) Answer: B

8) Answer: B

9) Answer: D

10) Answer: D

11) Answer: B

12) Answer: C

13) Answer: A

14) Answer: D

15) Answer: A