Physics Practice Questions- Ch. 13- Liquids

both A and D

1) Pressure in a liquid depends on the __________. A) depth of the measuring point. B) volume of the liquid. C) mass of the liquid. D) density of the liquid. E) both A and D

greater than the density of seawater

10) Lobsters live on the bottom of the ocean. The density of a lobster is __________. A) greater than the density of seawater B) equal to the density of seawater C) less than the density of seawater

water

11) The density of a submerged submarine is about the same as the density of __________. A) iron B) a floating submarine C) a crab D) water E) none of the above

the density of salt water exceeds the density of egg

12) 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 can conclude that __________. A) the density of salt water exceeds the density of egg. B) calcium in the eggshell is repelled by sodium chloride. C) buoyant forces do not always act upward. D) salt sinks to the bottom. E) none of the above

sink

13) If an object has a density greater than the density of water, it will __________. A) neither float nor sink, but stay anywhere it is put B) sink C) float

neither float nor sink, but stay anywhere it is put

14) If an object has a density equal to the density of water, it will __________. A) sink B) float C) neither float nor sink, but stay anywhere it is put

the iron displaces more water than it would if it were in a solid block

15) The reason an iron ship doesn't sink is that __________. A) air inside decreases it's weight B) the iron displaces more water than it would if it were in a solid block C) iron is less dense than water D) Nonsense -- an iron ship will always sink

it displaces a weight of water equal to its own weight

16) When first put in water, a plastic toy boat will sink until __________. A) it displaces a volume of water equal to its own volume B) the water density equals the density of the boat C) it displaces a weight of water equal to its own weight D) the buoyant force equals the volume of the boat E) the buoyant force equals the density of the boat

lower in the water

17) Compared to an empty ship, the same ship loaded with plastic foam will float __________. A) higher in the water B) at the same level in the water C) lower in the water

equal to the weight of the other bucket

18) Two equal-sized buckets are filled to the top with water. One of the buckets has a piece of wood floating in it, making its total weight __________. A) more than the weight of the other bucket B) less than the weight of the other bucket C) equal to the weight of the other bucket

greater on the lead

19) A block of balsa wood floats on water while a same-size block of lead lies submerged in the water. The buoyant force is __________. A) greater of the wood. B) greater on the lead. C) the same for both

The pressure is approximately the same in both places

2) Where is the pressure greater, one meter beneath the surface of Lake Michigan or one meter beneath the surface of a swimming pond? A) The pressure is approximately the same in both places B) In Lake Michigan C) In the pond

greater on the aluminum

20) A kilogram of lead and a kilogram of aluminum are submerged in water. The buoyant force is __________. A) greater on the aluminum. B) greater on the lead. C) the same on each

remain unchanged

21) A boat loaded with a barrel of water floats in a swimming pool. When the water in the barrel is poured overboard, the swimming pool level will __________. A) fall B) remain unchanged C) rise

higher in the salt water

22) When a boat sails from fresh water to salt water, the boat will float __________. A) higher in the salt water B) lower in the salt water C) at the same level

buoyant force on the iceberg would decrease

23) If the part of an iceberg that extends above the water were removed, the __________. A) density of the iceberg would change. B) buoyant force on the iceberg would decrease. C) iceberg would sink. D) pressure on the bottom of the iceberg would increase. E) none of the above

always sink to the bottom

24) If a weighted, air-filled balloon sinks in a lake, it will __________. A) be buoyed up with constant force while sinking. B) sink until it reaches equilibrium and then remain at constant depth. C) probably sink to the bottom and probably rise later. D) always sink to the bottom. E) none of the above

remains the same

25) When an ice cube in a glass of water melts, the water level __________. A) rises B) remains the same C) falls

fall

26) A floating ice cube contains a small piece of iron. After the ice cube melts, the water level will __________. A) rise B) remain unchanged C) fall

remain unchanged

27) An ice cube floating in a glass of water contains many air bubbles. When the ice melts, the water level will __________. A) rise B) remain unchanged C) fall

The force on his finger would have been less than 1 N

28) There is a legend of a Dutch boy who bravely held back the Atlantic Ocean by plugging a leak near the top of a dike with his finger until help arrived. Which of the following is most likely? A) The force on his finger would have been huge, but the pressure very small. B) This is impossible because of the large size of the Atlantic Ocean. C) The force on his finger would have been less than 1 N. D) Both the force and pressure on his finger would have been very large. E) none of the above

the same

29) When you float in salt water compared to floating in fresh water, the buoyant force that supports you is __________. A) the same B) greater C) less

bottom of the object

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

are transmitted to all points in the fluid

30) Pascal's principle says that changes in pressure at any point in an enclosed fluid __________. A) remain only at the point B) quickly diminish from point to point in the fluid C) are transmitted to all points in the fluid D) are transmitted only to points below it E) are transmitted only to points close to it

all of the above

31) A hydraulic press works because __________. A) one piston is larger than the other piston. B) liquids transmit pressure undiminished. C) Pascal's principle is operating. D) liquids transmit pressure in all directions. E) all of the above

Always false

32) The principle reason a hydraulic press works is that it is an exception to energy conservation. A) Always false B) Sometimes true C) Always true

smaller-diameter piston

33) A hydraulic arrangement consists of a water-filled U-tube that is wider on one end than on the other. Pistons are fitted in both ends. To multiply an input force, the input end should be the one having the __________. A) smaller-diameter piston B) larger-diameter piston C) It doesn't matter what relative size the piston is.

100 times

34) In a hydraulic device, the output piston has 100 times the cross-section area as the input piston. This means the device will multiply force __________. A) 100 times. B) 1000 times. C) 10 times. D) none of the above

the distance through which the force acts

35) A hydraulic press multiplies a force by 100. This multiplication is done at the expense of __________. A) the distance through which the force acts. B) energy, which decreases by a factor of 100. C) the time over which the force acts, which is extended by a factor of 100. D) the mechanism providing the force. E) none of the above

energy output to exceed the energy input

36) In a hydraulic press operation, it is impossible for the __________. A) output displacement to exceed the input displacement. B) output piston's speed to exceed the input piston's speed. C) force output to exceed the force input. D) energy output to exceed the energy input. E) none of the above

100 N per square meter

37) An industrial container holds 200 N of water. The area of the inside bottom of the container is 2 square meters. What pressure does the water exert on the bottom of the container? A) 400 N per square meter B) 200 N per square meter C) 800 N per square meter D) 100 N per square meter E) none of the above

1 N

38) Suppose a stone weighs 3 N in the air, but in water it weighs only 2 N. What is the buoyant force acting on the stone? A) 2 N B) 4 N C) 5 N D) 3 N E) 1 N

20 N

39) One liter of water weighs about 10 N. Suppose a 2-liter container is filled with 266 N of mercury and then lowered into a container of water. Assuming the container is completely submerged, what is the buoyant force acting on it? A) 133 N B) 20 N C) 266 N D) 26.6 N E) 10 N

surface area of the water

4) The pressure at the bottom of a jug filled with water does NOT depend on the __________. A) depth of the liquid B) density of water C) surface area of the water D) acceleration due to gravity E) none of the above

is the volume of 20 000 N of water

40) The volume of water displaced by a floating 20 000 N boat __________. A) is the volume of 20 000 N of water B) is the volume of the boat C) depends on the shape of the ship's hull D) is 20 000 cubic meters

100 liters

41) Floating Freda, who can just barely float in fresh water, has a mass of 100 kg. Her volume is therefore about __________. A) 100 liters. B) 220 liters. C) 50 liters. D) none of the above

50 N

42) A 5000-N car is lifted on a hydraulic piston of area 2000 square centimeters. How much force on a 20-square-centimeter piston is needed to lift the car? A) 2000 N B) 5000 N C) 250 N D) 50 N E) 500 N

weight of the fluid displaced

5) Archimedes' principle says that an object is buoyed up by a force that is equal to the __________. A) volume of the fluid displaced B) mass of the fluid displaced C) weight of the fluid displaced D) mass of the object E) none of the above

Neither place -- the buoyant force is independent of depth

6) Where is the buoyant force on a submerged rock greater, near the surface of the fluid or 10 m below the surface? A) Near the surface B) 10 m below the surface C) Neither place -- the buoyant force is independent of depth

partly submerged

7) The buoyant force on an object is least when the object is __________. A) submerged near the surface B) partly submerged C) submerged near the bottom D) none of the above

True

8) The reason objects immersed in a fluid experience an upward buoyant force is because fluid pressure on the bottom of the object is greater than fluid pressure on the top of the object. A) False B) True

you and the jacket together have density less than your density alone

9) The reason a life jacket helps you float is that __________. A) the jacket has the same density as an average human B) the jacket repels water C) the jacket makes you weigh less D) you and the jacket together have density less than your density alone.