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Density ^  Pressure ^

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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  1. Density ^  Pressure ^ Volume decreases  Pressure ^

  2. -- Questions -- MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

  3. 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.

  4. 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. 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.

  6. 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.

  7. 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.

  8. 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.

  9. 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.

  10. 15) In a vacuum, an object has no • A) buoyant force. • B) mass. • C) temperature. • D) weight. • E) all of these.

  11. -- Answers -- MULTIPLE CHOICE. The one alternative that best completes the statement or answers the question.

  12. 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

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