Physical Science Quiz Review

Consider two tubes filled with water at the same height, one with fresh water and the other with salt water. The pressure is less at the bottom of the tube with A) fresh water. B) salt water. C) both the same. D) depends on whether the tubes have the same cross-sectional area.

A) fresh water

1) When water in a brook or a system of pipes flows from a narrow region to a wide region, the speed of water in the wide region is A) less. B) about the same. C) exactly the same. D) more.

A) less

1) When a suction cup sticks to a wall it is A) pushed to the wall by the atmosphere. B) pulled to the wall by the vacuum. C) both of these D) neither of these

A) pushed to the wall by the atmosphere

If you do work on an object in half the time, your power output is A) twice. B) half. C) the same. D) 500 J.

A) twice.

1) When a chocolate bar is cut in half, its density is A) unchanged. B) halved.

A) unchanged

A machine can multiply forces or A. distances. B. work. C. energy. D. All of the above.

A. distances

1) Is there a buoyant force on you when you're not in the water? A) No. If there was you would float in air. B) Yes, a small amount due to displaced air. C) Yes, which is why you're sunk on the ground. D) Yes, but only when there's relative motion with the air.

B) Yes, a small amount due to displaced air.

Buoyant force is greatest on a submerged 1-cubic centimeter of A) iron. B) lead. C) aluminum. D)All the same

B) lead

1) If air speed is greater along the top surface of a bird's wings, pressure of the moving air there is A) unaffected B) reduced C) increased D) turbulent

B) reduced

1) When gas in a container is squeezed to one third its volume, its density A) halves. B) remains the same. C) triple D) doubles.

C) triple

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

C) upward pressure against the bottom is greater than downward pressure against the top of the submerged object

1) A completely submerged object always displaces its A) density of fluid B) weight of fluid. C) volume of fluid. D) All of these.

C) volume of fluid

1) A dam is thicker at the bottom than at the top partly because A) it looks better. B) water is denser at deeper levels. C) water pressure is greater with increasing depth. D) surface tension exists only on the surface of liquids

C) water pressure is greater with increasing depth

1) A 1-ton blimp hovers in air. The buoyant force acting on it is A) 1 ton B) less than 1 ton. C) zero. D) more than 1 ton

A) 1 ton

A jack system will increase the potential energy of a heavy load by no more than 1000 J with a work input of 2000 J. The efficiency of the jack system is at most A) 50%. B) 10%. C) 80%. D) 20%. E) not enough information

A) 50%

1) An umbrella tends to jerk upward on a windy day principally because A) air pressure is reduced over the curved top surface. B) buoyancy increases with increasing wind speed. C) air gets trapped under the umbrella, warms, and rises. D) all of the above

A) air pressure is reduced over the curved top surface

1) Wind blowing over the top of a hill A) decreases atmospheric pressure there. B) does not affect atmospheric pressure there. C) increases atmospheric pressure there.

A) decreases atmospheric pressure there

When you squeeze an air-filled party balloon and reduce its volume, you increase its A) density. B) mass. C) weight. D) All of these.

A) density

When a simple machine multiplies force, it decreases A) distance moved. B) potential energy. C) both D) neither

A) distance moved

1) Compared to the density of fish, the density of water is A) the same. B) more. C) less.

A) the same

Does a 3-meter-deep shallow lake or a 6-meter-deep small pond exert more pressure at the bottom of a dam that holds back the water? A) The three-meter-deep shallow lake. B) The six-meter-deep small pond. C)Same amount of pressure is exerted (atmospheric) so same force. D) Not enough information given in the question.

B) The six-meter-deep small pond

1) Blood pressure is normally greater in your A) ears. B) feet C) same in each

B) feet

It takes 40 J to push a large crate 4 m across a floor. The force exerted on the crate is A) 160 N. B) 4 N. C) 10 N. D) 40 N.

C) 10 N

A bow is drawn so that it has 40 J of potential energy. When the arrow is fired its kinetic energy is ideally A) more than 40 J. B) less than 40 J. C) 40 J.

C) 40 J.

Using 1000 J of work, a toy elevator is raised from the ground floor to the second floor in 20 s. How much power does the elevator use? A) 20 W B) 20,000 W C) 50 W D) 1000 W E) 100 W

C) 50

1) Airplane flight best illustrates A) Pascal's law. B) Archimedes' principle. C) Bernoulli's principle. D) Boyle's law.

C) Bernoulli's principle

1) Two cans are placed apart on straws. When air is blown in-between the cans, what will they do? A) Not move. B) They will move away from each other. C) They will move toward each other. D) Not enough information in problem.

C) They will move toward each other

1) The pressure in a liquid depends on liquid A) depth. B) density. C) both

C) both

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

C) both of these

A simple machine CANNOT multiply A) distance. B) force. C) energy. D) none of the above

C) energy

1) A lobster crawls onto a bathroom scale submerged in water. Compared to its weight above water, its weight while submerged is A) more. B) the same. C) less. D) None of these.

C) less

The most underlying feature of machines is A) that energy input always equals energy output. B) that power input always equals power output. C) the conservation of energy.

C) the conservation of energy

A 50-kg sack is lifted 2 m in the same time as a 25-kg sack is lifted 4 m. The power expended in raising the 50-kg sack compared to the power used to lift the 25-kg sack is A) twice as much. B) half as much. C) the same.

C) the same

A 1-kg iron ball and a 10-kg iron ball are dropped from rest from the top of a one-story building. When hitting the ground below, compared with the 1-kg ball, the 10-kg ball has A. less momentum and KE. B. the same momentum and KE. C. 10 times as much momentum and 10 times as much KE. D. 10 times as much momentum and 100 times as much KE.

C. 10 times as much momentum and 10 times as much KE.

A machine puts out 100 W of power for every 1000 W put into it. The efficiency of the machine is A) 50%. B) 110%. C) 90%. D) 10%. E) none of the above

D) 10%

Exert 1 N for a distance of 1 m in 1 s and you deliver a power of A) 2 W. B) 1/3 W. C) 3 W. D) 1W E) none of the above

D) 1W

Exert 100 J in 50 s and your power output is A) 1/2 W. B) 4 W. C) 1/4 W. D) 2 W.

D) 2 W

1) The air in this room has A) weight. B) mass. C) energy. D) all of the above E) none of the above

D) all of the above

1) As a weighted air-filled balloon sinks in water, the buoyant force on the balloon A) remains the same. B) becomes less. C) increases. D) no longer acts at sufficient depth

D) no longer acts at sufficient depth

The power expended for a barbell raised 2.0 m in 2 s is A) 4 W B) 1 W C) 8 W D) not enough information

D) not enough information

1) What is the buoyant force acting on a 120-ton floating ship? A) 120 tons in fresh water. B) Slightly more than 120 tons in salt water. C) Slightly less than 120 tons in salt water. D)120 tons in any water in which it floats.

D)120 tons in any water in which it floats

A model airplane moves three times as fast as another identical model airplane. Compared with the kinetic energy of the slower airplane, the kinetic energy of the faster airplane is A. the same for level flight. B. twice as much. C. four times as much. D. more than four times as much.

D. more than four times as much.