Introduction to Thermodynamics: Interactive Learning Quizzes

Question 1

Which of the following is the SI unit of temperature?

Accepted Answer

Kelvin

Answer

Degree Celsius

Answer

Degree Fahrenheit

Answer

Degree Rankine

Question 2

The first law of thermodynamics states that:

Accepted Answer

Energy is conserved

Answer

Energy can be created or destroyed

Answer

Entropy always increases

Answer

Heat always flows from hot to cold

Question 3

Which of the following is an example of a closed thermodynamic system?

Accepted Answer

A closed container filled with gas

Answer

A room with open windows

Answer

A moving piston

Answer

An open flame

Question 4

Which of the following is a measure of disorder in a system?

Accepted Answer

Entropy

Answer

Energy

Answer

Temperature

Answer

Volume

Question 5

An isentropic process is one in which:

Accepted Answer

Entropy remains constant

Answer

Entropy increases

Answer

Entropy decreases

Answer

Energy is transferred as heat

Question 6

The efficiency of a heat engine is the ratio of:

Accepted Answer

Work output to heat input

Answer

Heat input to work output

Answer

Temperature difference to heat input

Answer

Heat output to work input

Question 7

Which of the following is not a thermodynamic property?

Accepted Answer

Velocity

Answer

Pressure

Answer

Volume

Answer

Temperature

Question 8

A thermodynamic cycle is:

Accepted Answer

A series of processes that return a system to its initial state

Answer

A process that involves only heat transfer

Answer

A process that involves only work transfer

Answer

A process that violates the second law of thermodynamics

Question 9

Identify the option that does NOT describe a thermodynamic system:

Accepted Answer

An individual cycling

Answer

A closed container containing gas

Answer

A household refrigerator

Answer

A steam turbine

Question 10

The first law of thermodynamics primarily expresses:

Accepted Answer

Conservation of energy

Answer

Increase in entropy

Answer

Thermal equilibrium

Answer

Heat transfer

Question 11

What is the appropriate unit for expressing specific heat capacity?

Accepted Answer

J/kg·K

Answer

J/kg

Answer

W/kg·K

Answer

J/m³

Question 12

Which type of heat engine is the most efficient?

Accepted Answer

Carnot engine

Answer

Otto engine

Answer

Diesel engine

Answer

Turbine engine

Question 13

Entropy of a system can be understood as a measure of its:

Accepted Answer

Disorder

Answer

Energy content

Answer

Temperature

Answer

Pressure

Question 14

The thermal efficiency of a heat engine is defined as:

Accepted Answer

The ratio of work output to heat input

Answer

The ratio of heat output to work input

Answer

The difference between heat input and work output

Answer

The sum of heat input and work output

Question 15

Specific heat capacity is a measure of a system's:

Accepted Answer

Ability to absorb heat

Answer

Rate of heat transfer

Answer

Change in temperature

Answer

Thermal conductivity

Question 16

The change in entropy of a system is:

Accepted Answer

Equal to the heat added to the system divided by the temperature

Answer

Equal to the work done by the system divided by the temperature

Answer

Equal to the internal energy change of the system

Answer

Equal to the temperature change of the system

Question 17

The thermal efficiency of a heat engine is:

Accepted Answer

Equal to the work output divided by the heat input

Answer

Equal to the heat input divided by the work output

Answer

Equal to the change in internal energy divided by the heat input

Answer

Equal to the change in entropy divided by the heat input

Question 18

Which of the following is a dimensionless parameter used to characterize the irreversibility of a process?

Accepted Answer

Entropy generation number

Answer

Nusselt number

Answer

Reynolds number

Answer

Prandtl number

Question 19

The Gibbs free energy of a system is:

Accepted Answer

Equal to the enthalpy minus the product of temperature and entropy

Answer

Equal to the internal energy minus the product of temperature and entropy

Answer

Equal to the entropy minus the product of temperature and internal energy

Answer

Equal to the Helmholtz free energy minus the product of temperature and volume

Question 20

The first law of thermodynamics states that:

Accepted Answer

Energy can neither be created nor destroyed

Answer

Entropy always increases in closed systems

Answer

Heat always flows from hot to cold

Answer

The efficiency of heat engines is always 100%

Question 21

Heat and work, in the context of thermodynamics, differ primarily in that:

Accepted Answer

Heat is transferred due to a temperature difference, while work is transferred by a force acting through a distance

Answer

Heat is transferred by a force acting through a distance, while work is transferred due to a temperature difference

Answer

Heat and work are essentially the same concept

Answer

Neither heat nor work involves energy transfer

Question 22

A fundamental implication of the second law of thermodynamics is that:

Accepted Answer

Heat naturally flows from hot to cold.

Answer

Heat engines can achieve perfect efficiency.

Answer

Entropy in an isolated system may decrease.

Answer

Perpetual motion machines of the second kind are feasible.