Exam 4 T/F

Question 1

An isobaric process means that the pressure did not change.

Answer 1

True

Question 2

Energy can only be transferred via heat.

Answer 2

False

Question 3

For a gas undergoing a transition the specific heat depends on the type of processes being used

Answer 3

True

Question 4

Processes that are rapid can often be described as being an adiabatic process

Answer 4

True

Question 5

The pV diagram area within a cycle corresponds to the work on or by a heat engine

Answer 5

True

Question 6

The volume specific heat of a molecule changes with temperature as the number of degrees of freedom for the molecule changes

Answer 6

True

Question 7

Only reversible processes conserve energy

Answer 7

False

Question 8

If the cold reservoir is at absolute zero temperature then you could create a 100% efficient Carnot engine

Answer 8

True

Question 9

The COP of an engine must always be less than 1

Answer 9

False

Question 10

Nuclear power is the most efficient source of energy when used in a power station

Answer 10

False

Question 11

Heat is the amount of energy being transferred from a hot to a cold object

Answer 11

True

Question 12

Different materials can have different changes in temperature even if each receives the same amount of heat

Answer 12

True

Question 13

Heat loss by convection involves emission of electromagnetic energy

Answer 13

False

Question 14

Metals make poor thermal insulators because the have a low thermal conductivity

Answer 14

False they are poor insulators because of their relatively high thermal conductivity

Question 15

Liquids are compressible but gases are incompressible

Answer 15

False

Question 16

Temperature is a measure of the average kinetic energy of atoms or molecules in a substance

Answer 16

True

Question 17

Energy is released from ice as it melts

Answer 17

False

Question 18

When a metal disk with a hole through the center is heated the area of the hole increases.

Answer 18

True