Question 1

Surface tension is a direct result of

Accepted Answer

A) viscosity. 
B) Archimedes' principle. 
C) adhesive forces between molecules in a liquid or solid. 
D) cohesive forces between molecules in a liquid. 
A) viscosity. 
B) Archimedes' principle. 
C) adhesive forces between molecules in a liquid or solid. 
D) cohesive forces between molecules in a liquid. D

Question 2

An important condition for operation of the Falkirk Wheel is that

Accepted Answer

A) water in each gondola have the same depth. 
B) ships carried are more or less equal in weight. 
C) no water spill when a ship enters a gondola. 
D) all of the above 
E) none of the above 
A) water in each gondola have the same depth. 
B) ships carried are more or less equal in weight. 
C) no water spill when a ship enters a gondola. 
D) all of the above 
E) none of the above A

Question 3

The buoyant force acting on a 10-ton ship floating in the ocean is

Accepted Answer

A) less than 10 tons. 
B) 10 tons. 
C) more than 10 tons. 
D) depends on density of sea water 
A) less than 10 tons. 
B) 10 tons. 
C) more than 10 tons. 
D) depends on density of sea water B

Question 4

An ice cube floating in a glass of water contains many air bubbles. When the ice melts, the water level will

Accepted Answer

A) rise. 
B) fall. 
C) remain unchanged. 
A) rise. 
B) fall. 
C) remain unchanged.

Question 5

In a hydraulic-press operation, it is impossible for the

Accepted Answer

A) output displacement to exceed the input displacement. 
B) force output to exceed the force input. 
C) energy output to exceed the energy input. 
D) output piston's speed to exceed the input piston's speed. 
E) none of the above 
A) output displacement to exceed the input displacement. 
B) force output to exceed the force input. 
C) energy output to exceed the energy input. 
D) output piston's speed to exceed the input piston's speed. 
E) none of the above

Question 6

The attraction between like substances, stickiness, is called

Accepted Answer

A) adhesion. 
B) cohesion. 
C) depends on the substances. 
A) adhesion. 
B) cohesion. 
C) depends on the substances.

Question 7

A scale from which a rock is suspended reads 5 N when the rock is out of water and 3 N when the rock is submerged. Buoyant force on the rock is

Accepted Answer

A) 2 N. 
B) 3 N. 
C) 4 N. 
D) 5 N. 
A) 2 N. 
B) 3 N. 
C) 4 N. 
D) 5 N.

Question 8

The density of a submerged submarine at rest is about the same as the density of

Accepted Answer

A) a crab. 
B) iron. 
C) a floating submarine. 
D) water. 
E) none of the above 
A) a crab. 
B) iron. 
C) a floating submarine. 
D) water. 
E) none of the above

Question 9

Surface tension of liquids

Accepted Answer

A) increases when wetting agents are added. 
B) decreases as the liquid temperature increases. 
C) is about the same for all liquids. 
D) results from a thin molecular membrane beneath the liquid surface. 
E) keeps steel ships afloat. 
A) increases when wetting agents are added. 
B) decreases as the liquid temperature increases. 
C) is about the same for all liquids. 
D) results from a thin molecular membrane beneath the liquid surface. 
E) keeps steel ships afloat.

Question 10

Buoyant force is greater on a submerged

Accepted Answer

A) 1-kg block of lead. 
B) 1-kg block of aluminum. 
C) is the same on each 
A) 1-kg block of lead. 
B) 1-kg block of aluminum. 
C) is the same on each

Question 11

Lobsters live on the bottom of the ocean, which means their density is

Accepted Answer

A) greater than the density of sea water. 
B) equal to the density of sea water. 
C) less than the density of sea water. 
A) greater than the density of sea water. 
B) equal to the density of sea water. 
C) less than the density of sea water.

Question 12

A hydraulic press multiplies a force by 100, which is done at the expense of

Accepted Answer

A) energy, which is divided by 100. 
B) the distance through which the force acts. 
C) the time through which the force acts. 
D) the mechanism providing the force. 
E) none of the above 
A) energy, which is divided by 100. 
B) the distance through which the force acts. 
C) the time through which the force acts. 
D) the mechanism providing the force. 
E) none of the above

Question 13

The volume of water displaced by a floating 20-ton boat

Accepted Answer

A) is 20 cubic meters. 
B) is the volume of 20 tons of water. 
C) is the volume of the boat. 
D) depends on the shape of the ship's hull. 
E) none of the above 
A) is 20 cubic meters. 
B) is the volume of 20 tons of water. 
C) is the volume of the boat. 
D) depends on the shape of the ship's hull. 
E) none of the above

Question 14

Sara lies on a bed of sharp nails without harm because

Accepted Answer

A) many of the nails don't make contact with her body. 
B) her weight is distributed over hundreds of nails. 
C) she exercises mind over matter. 
D) none of the above 
A) many of the nails don't make contact with her body. 
B) her weight is distributed over hundreds of nails. 
C) she exercises mind over matter. 
D) none of the above

Question 15

An egg rests at the bottom of a bowl filled with water. When salt is slowly added to the water the egg rises and floats, from which we conclude

Accepted Answer

A) salt water is denser than fresh water. 
B) salt water is denser than an egg. 
C) both of these 
D) neither of these 
A) salt water is denser than fresh water. 
B) salt water is denser than an egg. 
C) both of these 
D) neither of these

Question 16

A completely submerged object always displaces its own

Accepted Answer

A) volume of fluid. 
B) weight of fluid. 
C) density of fluid. 
D) all of the above 
E) none of the above 
A) volume of fluid. 
B) weight of fluid. 
C) density of fluid. 
D) all of the above 
E) none of the above

Question 17

When holes are drilled through the wall of a water tower, water will spurt out with the greatest speed from the hole closest to

Accepted Answer

A) the bottom of the tower. 
B) the middle of the tower. 
C) the top of the tower. 
D) all the same 
A) the bottom of the tower. 
B) the middle of the tower. 
C) the top of the tower. 
D) all the same

Question 18

The pressure at the bottom of a jug filled with water does NOT depend on

Accepted Answer

A) the acceleration due to gravity. 
B) water density. 
C) the height of the liquid. 
D) surface area of the water. 
E) none of the above 
A) the acceleration due to gravity. 
B) water density. 
C) the height of the liquid. 
D) surface area of the water. 
E) none of the above

Question 19

A very lightweight horizontal loop of wire is suspended from a fine spring, lowered into water, and then raised to the surface. Any further attempt to raise it causes the spring to

Accepted Answer

A) stretch. 
B) contract. 
C) stay the same. 
A) stretch. 
B) contract. 
C) stay the same.

Question 20

A floating ice cube contains small pieces of iron. The water level after melting will

Accepted Answer

A) rise. 
B) fall. 
C) remain unchanged. 
A) rise. 
B) fall. 
C) remain unchanged.

Exam 13: Liquids

Surface tension is a direct result of

An important condition for operation of the Falkirk Wheel is that

The buoyant force acting on a 10-ton ship floating in the ocean is

An ice cube floating in a glass of water contains many air bubbles. When the ice melts, the water level will

In a hydraulic-press operation, it is impossible for the

The attraction between like substances, stickiness, is called

A scale from which a rock is suspended reads 5 N when the rock is out of water and 3 N when the rock is submerged. Buoyant force on the rock is

The density of a submerged submarine at rest is about the same as the density of

Surface tension of liquids

Buoyant force is greater on a submerged

Lobsters live on the bottom of the ocean, which means their density is

A hydraulic press multiplies a force by 100, which is done at the expense of

The volume of water displaced by a floating 20-ton boat

Sara lies on a bed of sharp nails without harm because

An egg rests at the bottom of a bowl filled with water. When salt is slowly added to the water the egg rises and floats, from which we conclude

A completely submerged object always displaces its own

When holes are drilled through the wall of a water tower, water will spurt out with the greatest speed from the hole closest to

The pressure at the bottom of a jug filled with water does NOT depend on

A very lightweight horizontal loop of wire is suspended from a fine spring, lowered into water, and then raised to the surface. Any further attempt to raise it causes the spring to

A floating ice cube contains small pieces of iron. The water level after melting will

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