A container of hydrogen gas has the same temperature as a container of denser oxygen gas. The gas atoms having the greater average kinetic energy are the
1) hydrogen,
2) oxygen,
3) both the same,
while the gas atoms having the greater average velocity are the
4) hydrogen.
5) oxygen.
6) both the same.
[Ques. 2] A gas and a plasma are similar in that they are both
1) fluids,
2) crystalline,
3) covalent,
4) in cohesively bound states,
while the principle difference between a gas and a plasma has to do with
5) atomic number.
6) density.
7) pressure.
8) electrical conduction.
[Ques. 3] When we drink through a straw, the liquid is actually
1) pulled up
2) sucked up
3) pushed up
by
4) atmospheric pressure.
5) reduced pressure in the straw.
6) surface tension.
7) capillarity.
[Ques. 4] When gas in a container is squeezed to half its volume, its density is
1) halved,
2) unchanged,
3) doubled,
4) quadrupled,
and neglecting any temperature changes we would find the gas pressure to be
5) halved.
6) unchanged.
7) doubled.
8) quadrupled.
[Ques. 5] If you are standing on the Moon and release a strong balloon filled with helium gas, the balloon will
1) rise.
2) fall.
3) neither rise nor fall.
This occurs because
4) helium gas is lighter than air.
5) the Moon does not have an atmosphere.
6) gravity is weaker on the Moon.
[Ques. 6] Which has a greater buoyant force?
1) a huge lead zeppelin
2) a small helium-filled balloon
3) both
4) neither
because
5) of its low density.
6) it occupies the greatest amount of space.
7) it occupies the least amount of space.
8) both have comparable densities.
[Ques. 7] An umbrella has a tendency to move upward when it is windy principally because
1) moving air over the curved surface produces reduced pressure against its top.
2) air moves up into the bowl and pushes upward with increased pressure.
3) buoyancy increases with increasing wind speed.
4) the umbrella is simply pushed upward by the wind.
This effect was first accurately described by
5) Galileo.
6) Newton.
7) Bernoulli.
8) Einstein.
9) Archimedes.
[Ques. 8] It would be easier to pull the hemispheres apart
1) when they are at sea level
2) if submerged several meters in water
3) if high above the clouds
because
4) external pressure on the hemispheres is lessened.
5) water serves as a lubricant.
6) the atmosphere exerts a pressure of 105 N/m2 on both hemispheres.
[Ques. 9] Atmospheric pressure is 105 N/m2 at sea level. This means that
1) a column of air 1 square meter in cross section extending up to the top of the atmosphere weighs 105 N,
2) the weight of one cubic meter of air at sea level is about 105 N,
3) the density of air is 105 N/m3,
and the force of the atmosphere against a surface of one square meter is
4) somewhat less than 105 N.
5) about 105 N.
6) considerably more than 105 N.
[Ques. 10] The air in a closed room has
1) mass,
2) energy,
3) weight,
4) all of these,
5) none of these,
and the greater the rate of molecular motion in the air, the greater the
6) temperature.
7) molecular kinetic energy.
8) air pressure.
9) all of these.
10) none of these.
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