Question 1

An ideal frictionless engine absorbs heat at 400 K and exhausts heat at 300 K.Its efficiency is

Accepted Answer

A) 25%. 
B) 33%. 
C) 75%. 
D) 133%. 
A) 25%. 
B) 33%. 
C) 75%. 
D) 133%. A

Question 2

Of the substances below, the one with the highest specific heat is

Accepted Answer

A) water. 
B) ice. 
C) concrete. 
D) gold. 
A) water. 
B) ice. 
C) concrete. 
D) gold. A

Question 3

Fifty kJ of heat is added to a 10-kg piece of lead at its melting point of 330$\circ$C and 2 kg of lead melts.The heat of fusion of lead is

Accepted Answer

A) 2.5 kJ/kg. 
B) 3.3 kJ/kg. 
C) 5 kJ/kg. 
D) 25 kJ/kg. 
A) 2.5 kJ/kg. 
B) 3.3 kJ/kg. 
C) 5 kJ/kg. 
D) 25 kJ/kg. D

Question 4

If the pressure on 10 m3 of air is increased from 200 kPa to 800 kPa, the new volume of air will be

Accepted Answer

A) 1.25 m3. 
B) 1.67 m3. 
C) 2.5 m3. 
D) 40 m3. 
A) 1.25 m3. 
B) 1.67 m3. 
C) 2.5 m3. 
D) 40 m3.

Question 5

A temperature of 120$\circ$F is almost exactly

Accepted Answer

A) 35$\circ$C. 
B) 49$\circ$C. 
C) 67$\circ$C. 
D) 88$\circ$C. 
A) 35$\circ$C. 
B) 49$\circ$C. 
C) 67$\circ$C. 
D) 88$\circ$C.

Question 6

Steam at 100$\circ$C is more dangerous than the same mass of water at 100$\circ$C because the steam

Accepted Answer

A) is less dense. 
B) moves faster. 
C) has a higher specific heat. 
D) releases a great deal of heat when it condenses. 
A) is less dense. 
B) moves faster. 
C) has a higher specific heat. 
D) releases a great deal of heat when it condenses.

Question 7

The melting point of water is 0$\circ$C.Its freezing point is

Accepted Answer

A) slightly less than 0$\circ$C. 
B) 0$\circ$C. 
C) slightly more than 0$\circ$C. 
D) 32$\circ$C. 
A) slightly less than 0$\circ$C. 
B) 0$\circ$C. 
C) slightly more than 0$\circ$C. 
D) 32$\circ$C.

Question 8

The first law of thermodynamics is the same as the

Accepted Answer

A) second law of thermodynamics. 
B) law of conservation of energy. 
C) law of conservation of momentum. 
D) first law of motion. 
A) second law of thermodynamics. 
B) law of conservation of energy. 
C) law of conservation of momentum. 
D) first law of motion.

Question 9

The physics underlying the operation of a refrigerator most closely resembles the physics underlying

Accepted Answer

A) a heat engine. 
B) the melting of ice. 
C) the freezing of water. 
D) the evaporation of water. 
A) a heat engine. 
B) the melting of ice. 
C) the freezing of water. 
D) the evaporation of water.

Question 10

Heat can be transferred through a solid by which one or more of the following?

Accepted Answer

A) conduction 
B) convection 
C) radiation 
D) condensation 
E) Both A and C 
A) conduction 
B) convection 
C) radiation 
D) condensation 
E) Both A and C

Question 11

If a heat engine that exhausts heat at 400 K is to have an efficiency of 33%, it must take in heat at a minimum of

Accepted Answer

A) 133 K. 
B) 449 K. 
C) 532 K. 
D) 600 K. 
A) 133 K. 
B) 449 K. 
C) 532 K. 
D) 600 K.

Question 12

Heat conduction is most efficient in

Accepted Answer

A) metals. 
B) nonmetallic solids. 
C) water. 
D) gases. 
A) metals. 
B) nonmetallic solids. 
C) water. 
D) gases.

Question 13

Heat can be transferred through a vacuum by which one or more of the following?

Accepted Answer

A) conduction 
B) convection 
C) radiation 
D) condensation 
A) conduction 
B) convection 
C) radiation 
D) condensation

Question 14

A barometer measures

Accepted Answer

A) atmospheric density. 
B) atmospheric pressure. 
C) water density. 
D) water pressure. 
A) atmospheric density. 
B) atmospheric pressure. 
C) water density. 
D) water pressure.

Question 15

At which of the following Celsius temperatures will a Fahrenheit thermometer show the same reading in degrees?

Accepted Answer

A) -40$\circ$C 
B) 0$\circ$C 
C) 32$\circ$C 
D) 40$\circ$C 
A) -40$\circ$C 
B) 0$\circ$C 
C) 32$\circ$C 
D) 40$\circ$C

Question 16

Buoyancy occurs because, as the depth in a fluid increases, the fluid's

Accepted Answer

A) pressure increases. 
B) pressure decreases. 
C) density increases. 
D) density decreases. 
A) pressure increases. 
B) pressure decreases. 
C) density increases. 
D) density decreases.

Question 17

Which of the following formulas expresses the relationship between the pressure and absolute temperature of a gas sample whose volume is fixed?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 18

When a liquid freezes to become a solid,

Accepted Answer

A) its temperature rises. 
B) its temperature falls. 
C) it absorbs heat. 
D) it gives off heat. 
A) its temperature rises. 
B) its temperature falls. 
C) it absorbs heat. 
D) it gives off heat.

Question 19

The freezing point of a substance is always lower than its

Accepted Answer

A) melting point. 
B) boiling point. 
C) heat of fusion. 
D) heat of vaporization. 
A) melting point. 
B) boiling point. 
C) heat of fusion. 
D) heat of vaporization.

Question 20

Suppose there were molecules that had no attraction whatsoever for one another.A collection of such molecules would form a

Accepted Answer

A) gas. 
B) liquid. 
C) amorphous solid. 
D) crystalline solid. 
A) gas. 
B) liquid. 
C) amorphous solid. 
D) crystalline solid.

An ideal frictionless engine absorbs heat at 400 K and exhausts heat at 300 K.Its efficiency is

Of the substances below, the one with the highest specific heat is

Fifty kJ of heat is added to a 10-kg piece of lead at its melting point of 330^$\circ$C and 2 kg of lead melts.The heat of fusion of lead is

If the pressure on 10 m³ of air is increased from 200 kPa to 800 kPa, the new volume of air will be

A temperature of 120^$\circ$F is almost exactly

Steam at 100^$\circ$C is more dangerous than the same mass of water at 100^$\circ$C because the steam

The melting point of water is 0^$\circ$C.Its freezing point is

The first law of thermodynamics is the same as the

The physics underlying the operation of a refrigerator most closely resembles the physics underlying

Heat can be transferred through a solid by which one or more of the following?

If a heat engine that exhausts heat at 400 K is to have an efficiency of 33%, it must take in heat at a minimum of

Heat conduction is most efficient in

Heat can be transferred through a vacuum by which one or more of the following?

A barometer measures

At which of the following Celsius temperatures will a Fahrenheit thermometer show the same reading in degrees?

Buoyancy occurs because, as the depth in a fluid increases, the fluid's

Which of the following formulas expresses the relationship between the pressure and absolute temperature of a gas sample whose volume is fixed?

When a liquid freezes to become a solid,

The freezing point of a substance is always lower than its

Suppose there were molecules that had no attraction whatsoever for one another.A collection of such molecules would form a

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

Exam 5: Matter and Heat

An ideal frictionless engine absorbs heat at 400 K and exhausts heat at 300 K.Its efficiency is

Of the substances below, the one with the highest specific heat is

Fifty kJ of heat is added to a 10-kg piece of lead at its melting point of 330 ∘\circ∘ C and 2 kg of lead melts.The heat of fusion of lead is

If the pressure on 10 m3 of air is increased from 200 kPa to 800 kPa, the new volume of air will be

A temperature of 120 ∘\circ∘ F is almost exactly

Steam at 100 ∘\circ∘ C is more dangerous than the same mass of water at 100 ∘\circ∘ C because the steam

The melting point of water is 0 ∘\circ∘ C.Its freezing point is

The first law of thermodynamics is the same as the

The physics underlying the operation of a refrigerator most closely resembles the physics underlying

Heat can be transferred through a solid by which one or more of the following?

If a heat engine that exhausts heat at 400 K is to have an efficiency of 33%, it must take in heat at a minimum of

Heat conduction is most efficient in

Heat can be transferred through a vacuum by which one or more of the following?

A barometer measures

At which of the following Celsius temperatures will a Fahrenheit thermometer show the same reading in degrees?

Buoyancy occurs because, as the depth in a fluid increases, the fluid's

Which of the following formulas expresses the relationship between the pressure and absolute temperature of a gas sample whose volume is fixed?

When a liquid freezes to become a solid,

The freezing point of a substance is always lower than its

Suppose there were molecules that had no attraction whatsoever for one another.A collection of such molecules would form a

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

Fifty kJ of heat is added to a 10-kg piece of lead at its melting point of 330^$\circ$C and 2 kg of lead melts.The heat of fusion of lead is

If the pressure on 10 m³ of air is increased from 200 kPa to 800 kPa, the new volume of air will be

A temperature of 120^$\circ$F is almost exactly

Steam at 100^$\circ$C is more dangerous than the same mass of water at 100^$\circ$C because the steam

The melting point of water is 0^$\circ$C.Its freezing point is