Chapter 13 Liquids Chapter 14 Gases 1) Water pressure is greatest against the 9) A bubble of air released from the bottom of a lake A) sides of a submerged object. A) becomes larger as it rises. B) is the same against all surfaces. B) rises to the top at constant volume. C) bottom of a submerged object. C) becomes smaller as it rises. D) top of a submerged object. D) alternately expands and contracts as it rises. E) none of these. E) none of these.

2) Blood pressure is normally greater in your A) ears. 10) A column that extends from sea level to the top of the B) feet. (Ans: further down) atmosphere contains a certain mass of air. If the same column C) same in each. instead had the same mass of mercury (Hg) in it, the height of the mercury column would be 3) A block of wood normally weighs 5 N. The buoyant force A) 1/13.6 times the height of the atmosphere. that mercury will exert on the wood as it floats in mercury is B) about 3/4 meter.

A) 5 N. ΣFy = 0 or FBuoy = FWeight C) 10.3 meters. (10.3 meter is for water, not Hg) B) less than 5 N. D) about 5.6 kilometers. C) more than 5 N.

4) A liter-sized block of ordinary wood floats in water. The 11) As a high-altitude balloon sinks lower and lower into the amount of water displaced is atmosphere, it undergoes a decrease in A) less than 1 liter. A) density. B) more than 1 liter. B) mass. C) 1 liter. C) weight. D) depends on the water density. D) volume. E) none of these. E) none of these.

5) A boat loaded with scrap iron floats in a swimming pool. When the 12) As a woman holding her breath swims deeper and deeper iron is thrown overboard, the pool beneath the water's surface, her density water level will A) remains the same. A) fall. B) increases. But very slightly B) rise. C) decreases. C) remain unchanged.

6) A boat loaded with wood floats in a swimming pool. When 13) An umbrella tends to move upwards on a windy day the wood is thrown overboard, the pool water level will principally because A) fall. A) buoyancy increases with increasing wind speed. B) remain unchanged. B) air pressure is reduced over the curved top surface. C) rise. C) air gets trapped under the umbrella, warms, and rises. D) all of these. 7) A block of wood half as dense as water floats with half its volume above water. A piece of iron is then tied on top so the wood floats with only 1/4 its volume above the surface. If the 14) Suppose you are standing on a weighing scale and all of a wood and iron are turned over so that the iron is submerged sudden the atmosphere vanished. The reading on the scale would beneath the wood, then the volume of wood above the water A) remain the same. surface will be B) increase. FB due to air is gone A) the same, 1/4. C) decrease. B) less than 1/4. C) more than 1/4. D) there's no way to say. 15) When a gas is heated and becomes a plasma, its electric charge is usually 8) A hydraulic arrangement consists of A) negative. a water filled U-tube that is wider at one B) non-existent end than at the other. Pistons are fitted C) balanced. All of the electrons and protons remain. in both ends. The ratio of output force D) positive. to input force will be equal to the ratio E) none of these. of the output and input piston

A) areas. P = P2

B) diameters. F/A = F2/A2 C) radii. D) all of these. E) none of these.