Question 1

The density of brass is 8 * 103 kg/m3.The volume occupied by 320 g of brass is

Accepted Answer

A) 0.038 cm3. 
B) 3.2 cm3. 
C) 38 cm3. 
D) 380 cm3. 
A) 0.038 cm3. 
B) 3.2 cm3. 
C) 38 cm3. 
D) 380 cm3.

Question 2

Which of the following is not true of molecular motion in a gas?

Accepted Answer

A) There is no order in the motion. 
B) There is no uniformity of speed or direction. 
C) There is a definite average speed at a given temperature. 
D) There is a definite average direction of motion at a given temperature. 
A) There is no order in the motion. 
B) There is no uniformity of speed or direction. 
C) There is a definite average speed at a given temperature. 
D) There is a definite average direction of motion at a given temperature.

Question 3

Ice floats in water because

Accepted Answer

A) its density is less than that of water. 
B) its specific heat is less than that of water. 
C) it is a solid whereas water is a liquid. 
D) it is colder than water. 
A) its density is less than that of water. 
B) its specific heat is less than that of water. 
C) it is a solid whereas water is a liquid. 
D) it is colder than water.

Question 4

A 3-kg pine board is 20 cm wide, 2 cm thick, and 2 m long.The density of the board is

Accepted Answer

A) 240 kg/m3. 
B) 267 kg/m3. 
C) 375 kg/m3. 
D) 469 kg/m3. 
A) 240 kg/m3. 
B) 267 kg/m3. 
C) 375 kg/m3. 
D) 469 kg/m3.

Question 5

In order to operate, a heat engine must have

Accepted Answer

A) either a hot or a cold reservoir. 
B) both a hot and a cold reservoir. 
C) a boiler. 
D) a supply of fuel that can be burned, such as coal or oil. 
A) either a hot or a cold reservoir. 
B) both a hot and a cold reservoir. 
C) a boiler. 
D) a supply of fuel that can be burned, such as coal or oil.

Question 6

One liter of hydrogen gas at atmospheric pressure is allowed to expand to a volume of 3 liters with the temperature held constant.If the average speed of the hydrogen molecules was originally v, their new average speed is

Accepted Answer

A) v/9. 
B) v/3. 
C) v. 
D) 3 v. 
A) v/9. 
B) v/3. 
C) v. 
D) 3 v.

Question 7

Oxygen boils at -183$\circ$C.This temperature is

Accepted Answer

A) -215$\circ$F. 
B) -297$\circ$F. 
C) -329$\circ$F. 
D) -361$\circ$F. 
A) -215$\circ$F. 
B) -297$\circ$F. 
C) -329$\circ$F. 
D) -361$\circ$F.

Question 8

An ideal frictionless engine takes in 10 kJ of heat per second when it operates between 500 K and 400 K.The work that the engine does per second is

Accepted Answer

A) 2 kJ. 
B) 2.5 kJ. 
C) 8 kJ. 
D) 10 kJ. 
A) 2 kJ. 
B) 2.5 kJ. 
C) 8 kJ. 
D) 10 kJ.

Question 9

A sample of a gas is expanded to twice its original volume while its temperature is held constant.Relative to their original average energy, the new average energy of the molecules is

Accepted Answer

A) half as great. 
B) the same. 
C) twice as great. 
D) four times as great. 
A) half as great. 
B) the same. 
C) twice as great. 
D) four times as great.

Question 10

When a gas is forced into a smaller volume without a change in temperature, its pressure increases because its molecules

Accepted Answer

A) strike the container walls more often. 
B) strike the container walls at higher speeds. 
C) strike the container walls with greater force. 
D) have more energy. 
A) strike the container walls more often. 
B) strike the container walls at higher speeds. 
C) strike the container walls with greater force. 
D) have more energy.

Question 11

The temperature of a gas sample in a rigid container is raised.The pressure the gas exerts on the container walls increases because

Accepted Answer

A) the molecules are in contact with the walls for briefer intervals. 
B) the molecular masses increase. 
C) the molecules have higher average speeds and so strike the walls more often with greater momentum. 
D) the molecules lose more kinetic energy each time they strike the wall. 
A) the molecules are in contact with the walls for briefer intervals. 
B) the molecular masses increase. 
C) the molecules have higher average speeds and so strike the walls more often with greater momentum. 
D) the molecules lose more kinetic energy each time they strike the wall.

Question 12

A refrigerator gives off

Accepted Answer

A) less heat than it absorbs from its contents. 
B) the same amount of heat it absorbs from its contents. 
C) more heat than it absorbs from its contents. 
D) Any of these choices could be correct, depending on the circumstances. 
A) less heat than it absorbs from its contents. 
B) the same amount of heat it absorbs from its contents. 
C) more heat than it absorbs from its contents. 
D) Any of these choices could be correct, depending on the circumstances.

Question 13

In order to double the average energy of the molecules in a gas at 200 K, its temperature must be changed to

Accepted Answer

A) 100 K. 
B) 400 K. 
C) 800 K. 
D) 1600 K. 
A) 100 K. 
B) 400 K. 
C) 800 K. 
D) 1600 K.

Question 14

The average pressure of the atmosphere at sea level corresponds to which one or more of the following?

Accepted Answer

A) 101 Pa 
B) 101 kPa 
C) 98 kPa 
D) 15 lb/in2 
E) Both B and D 
A) 101 Pa 
B) 101 kPa 
C) 98 kPa 
D) 15 lb/in2 
E) Both B and D

Question 15

When a vapor condenses into a liquid,

Accepted Answer

A) its temperature decreases. 
B) its temperature increases. 
C) it absorbs heat. 
D) it gives off heat. 
A) its temperature decreases. 
B) its temperature increases. 
C) it absorbs heat. 
D) it gives off heat.

Question 16

In order for an object to sink when placed in water, the object's average density must be

Accepted Answer

A) less than that of water. 
B) equal to that of water. 
C) more than that of water. 
D) Any of these choices are correct, depending on the object's shape. 
A) less than that of water. 
B) equal to that of water. 
C) more than that of water. 
D) Any of these choices are correct, depending on the object's shape.

Question 17

The specific heat of ice is 2.1 kJ/kg.$\circ$C.When 20 kJ of heat is removed from 1.2 kg of ice originally at -5$\circ$C, its new temperature is

Accepted Answer

A) -18$\circ$C. 
B) -23$\circ$C. 
C) -26$\circ$C. 
D) 35$\circ$C. 
A) -18$\circ$C. 
B) -23$\circ$C. 
C) -26$\circ$C. 
D) 35$\circ$C.

Question 18

When 90 kJ is removed from a 2-kg copper bar, its temperature drops from 200$\circ$C to 85$\circ$C.The specific heat of iron is

Accepted Answer

A) 0.16 kJ/kg.$\circ$C. 
B) 0.19 kJ/kg.$\circ$C. 
C) 0.23 kJ/kg.$\circ$C. 
D) 0.39 kJ/kg.$\circ$C. 
A) 0.16 kJ/kg.$\circ$C. 
B) 0.19 kJ/kg.$\circ$C. 
C) 0.23 kJ/kg.$\circ$C. 
D) 0.39 kJ/kg.$\circ$C.

Question 19

An absolute temperature of 100 K is the same as a Celsius temperature of

Accepted Answer

A) -173$\circ$C. 
B) 32$\circ$C. 
C) 212$\circ$C. 
D) 373$\circ$C. 
A) -173$\circ$C. 
B) 32$\circ$C. 
C) 212$\circ$C. 
D) 373$\circ$C.

Question 20

Molecules are, in general, farthest apart from one another in

Accepted Answer

A) gases. 
B) liquids. 
C) crystalline solids. 
D) amorphous solids. 
A) gases. 
B) liquids. 
C) crystalline solids. 
D) amorphous solids.

The density of brass is 8 * 10³ kg/m³.The volume occupied by 320 g of brass is

Which of the following is not true of molecular motion in a gas?

Ice floats in water because

A 3-kg pine board is 20 cm wide, 2 cm thick, and 2 m long.The density of the board is

In order to operate, a heat engine must have

One liter of hydrogen gas at atmospheric pressure is allowed to expand to a volume of 3 liters with the temperature held constant.If the average speed of the hydrogen molecules was originally v, their new average speed is

Oxygen boils at -183^$\circ$C.This temperature is

An ideal frictionless engine takes in 10 kJ of heat per second when it operates between 500 K and 400 K.The work that the engine does per second is

A sample of a gas is expanded to twice its original volume while its temperature is held constant.Relative to their original average energy, the new average energy of the molecules is

When a gas is forced into a smaller volume without a change in temperature, its pressure increases because its molecules

The temperature of a gas sample in a rigid container is raised.The pressure the gas exerts on the container walls increases because

A refrigerator gives off

In order to double the average energy of the molecules in a gas at 200 K, its temperature must be changed to

The average pressure of the atmosphere at sea level corresponds to which one or more of the following?

When a vapor condenses into a liquid,

In order for an object to sink when placed in water, the object's average density must be

The specific heat of ice is 2.1 kJ/kg.^$\circ$C.When 20 kJ of heat is removed from 1.2 kg of ice originally at -5^$\circ$C, its new temperature is

When 90 kJ is removed from a 2-kg copper bar, its temperature drops from 200^$\circ$C to 85^$\circ$C.The specific heat of iron is

An absolute temperature of 100 K is the same as a Celsius temperature of

Molecules are, in general, farthest apart from one another in

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Exam 5: Matter and Heat

The density of brass is 8 * 103 kg/m3.The volume occupied by 320 g of brass is

Which of the following is not true of molecular motion in a gas?

Ice floats in water because

A 3-kg pine board is 20 cm wide, 2 cm thick, and 2 m long.The density of the board is

In order to operate, a heat engine must have

One liter of hydrogen gas at atmospheric pressure is allowed to expand to a volume of 3 liters with the temperature held constant.If the average speed of the hydrogen molecules was originally v, their new average speed is

Oxygen boils at -183 ∘\circ∘ C.This temperature is

An ideal frictionless engine takes in 10 kJ of heat per second when it operates between 500 K and 400 K.The work that the engine does per second is

A sample of a gas is expanded to twice its original volume while its temperature is held constant.Relative to their original average energy, the new average energy of the molecules is

When a gas is forced into a smaller volume without a change in temperature, its pressure increases because its molecules

The temperature of a gas sample in a rigid container is raised.The pressure the gas exerts on the container walls increases because

A refrigerator gives off

In order to double the average energy of the molecules in a gas at 200 K, its temperature must be changed to

The average pressure of the atmosphere at sea level corresponds to which one or more of the following?

When a vapor condenses into a liquid,

In order for an object to sink when placed in water, the object's average density must be

The specific heat of ice is 2.1 kJ/kg. ∘\circ∘ C.When 20 kJ of heat is removed from 1.2 kg of ice originally at -5 ∘\circ∘ C, its new temperature is

When 90 kJ is removed from a 2-kg copper bar, its temperature drops from 200 ∘\circ∘ C to 85 ∘\circ∘ C.The specific heat of iron is

An absolute temperature of 100 K is the same as a Celsius temperature of

Molecules are, in general, farthest apart from one another in

The Scientific Method

Motion

Energy

Energy and the Future

Electricity and Magnetism

Waves

The Nucleus

The Atom

The Periodic Law

Crystals, Ions, and Solutions

Chemical Reactions

Organic Chemistry

Atmosphere and Hydrosphere

The Rock Cycle

The Evolving Earth

The Solar System

The Stars

Universe

Filters

The density of brass is 8 * 10³ kg/m³.The volume occupied by 320 g of brass is

Oxygen boils at -183^$\circ$C.This temperature is

The specific heat of ice is 2.1 kJ/kg.^$\circ$C.When 20 kJ of heat is removed from 1.2 kg of ice originally at -5^$\circ$C, its new temperature is

When 90 kJ is removed from a 2-kg copper bar, its temperature drops from 200^$\circ$C to 85^$\circ$C.The specific heat of iron is