Physics Practice Questions- Ch. 13

1) Water pressure is greatest against the A) top of a submerged object. B) bottom of a submerged object. C) sides of a submerged object. D) is the same against all surfaces E) none of these

3) The pressure in a liquid depends on liquid A) density. B) depth. C) both of these D) neither of these

6) The mass of a cubic meter of water is A) 1 kg. B) 10 kg. C) 100 kg. D) 1000 kg. E) 9800 N.

8) The reason that buoyant force acts upward on a submerged object is that A) it acts in a direction to oppose gravity. B) if it acted downward, nothing would float. C) the weight of fluid displaced reacts with an upward force. D) upward pressure against the bottom is greater than downward pressure against the top of the submerged object.

9) A completely submerged object always displaces its own A) volume of fluid. B) weight of fluid. C) density of fluid. D) all of these E) none of these

10) A fish normally displaces its own A) volume of water. B) weight of water. C) both of these D) neither of these

13) What is the weight of water displaced by a 100-ton floating ship? A) less than 100 tons B) 100 tons C) more than 100 tons D) 100 cubic meters E) depends on the ship's shape

14) When an object is partly or wholly immersed in a liquid, it is buoyed up A) by a force equal to its own weight. B) by a force equal to the weight of liquid displaced. C) and floats because of Archimedes principle. D) but nevertheless sinks. E) none of these

19) When holes are drilled through the wall of a water tower , water will spurt out the greatest horizontal distance from the hole closest to A) the bottom of the tower. B) the middle of the tower. C) the top of the tower. D) The horizontal distance will be the same for all holes.

24) A rock suspended by a string weighs 5 N out of water and 3 N when submerged. What is the buoyant force on the rock? A) 8 N B) 5 N C) 3 N D) 2 N E) none of these

25) An egg is placed at the bottom of a bowl filled with water. Salt is slowly added to the water until the egg rises and floats. From this experiment, one concludes A) calcium in the egg shell is repelled by sodium chloride. B) the density of salt water exceeds the density of egg. C) buoyant force does not always act upward. D) salt sinks to the bottom.

27) A block of wood weighing 5 N in air, is difficult fully submerge in a pool of mercury because the buoyant force when fully submerged is A) less than 5 N. B) 5 N. C) more than 5 N.

29) Compared to an empty ship, the same ship loaded with styrofoam will float A) higher in the water. B) lower in the water. C) at the same level in the water.