Thermodynamic Systems and Properties: Interactive Learning Quizzes

Question 1

An isothermal process is one in which:

Accepted Answer

Temperature remains constant

Answer

Volume remains constant

Answer

Pressure remains constant

Answer

Entropy remains constant

Question 2

The property representing energy stored within a system is:

Accepted Answer

Internal energy

Answer

Enthalpy

Answer

Entropy

Answer

Exergy

Question 3

Which of the following is **not** a thermodynamic property?

Accepted Answer

Rate of change of pressure

Answer

Temperature

Answer

Pressure

Answer

Volume

Question 4

The first law of thermodynamics states that:

Accepted Answer

Energy cannot be created or destroyed, only transferred or transformed.

Answer

Entropy always increases in irreversible processes.

Answer

Heat always flows from a higher temperature reservoir to a lower temperature reservoir.

Answer

The efficiency of a heat engine can never exceed 100%.

Question 5

Which of the following is **not** a reversible process?

Accepted Answer

Adiabatic combustion of fuel

Answer

Adiabatic expansion of an ideal gas

Answer

Isothermal compression of an ideal gas

Answer

Quasi-static expansion of an ideal gas

Question 6

The specific heat capacity of a substance is defined as:

Accepted Answer

The amount of heat required to raise the temperature of 1 kg of the substance by 1 K.

Answer

The amount of heat required to raise the temperature of 1 g of the substance by 1 °C.

Answer

The amount of heat required to melt 1 kg of the substance.

Answer

The amount of heat required to vaporize 1 kg of the substance.

Question 7

A thermodynamic cycle is a series of processes that:

Accepted Answer

Return the system to its initial state.

Answer

Involve heat transfer between two systems.

Answer

Involve work done on the system.

Answer

Involve a phase change.

Question 8

The efficiency of a heat engine is defined as the:

Accepted Answer

Ratio of the work output to the heat input.

Answer

Ratio of the heat input to the work output.

Answer

Difference between the heat input and the work output.

Answer

Sum of the heat input and the work output.

Question 9

Which thermodynamic process is characterized by the absence of heat transfer?

Accepted Answer

Adiabatic

Answer

Isothermal

Answer

Isochoric

Answer

Isobaric

Question 10

Which of the following is the SI unit of entropy?

Accepted Answer

Kelvin per joule

Answer

Joules

Answer

Pascals

Answer

Cubic meters

Question 11

What thermodynamic property quantifies the randomness or disorder within a system?

Accepted Answer

Entropy

Answer

Temperature

Answer

Pressure

Answer

Specific volume

Question 12

A closed thermodynamic system is one that:

Accepted Answer

Can exchange energy but not mass with its surroundings

Answer

Can exchange both energy and mass with its surroundings

Answer

Cannot exchange either energy or mass with its surroundings

Question 13

The state of a thermodynamic system is completely defined by its:

Accepted Answer

Independent properties

Answer

Surroundings

Answer

Path history

Answer

Dependent properties

Question 14

Which of the following is a path function in thermodynamics?

Accepted Answer

Heat

Answer

Pressure

Answer

Temperature

Answer

Volume

Question 15

The first law of thermodynamics states that:

Accepted Answer

Energy is conserved

Answer

Entropy is conserved

Answer

Volume is conserved

Answer

Temperature is conserved

Question 16

An ideal gas is characterized by:

Accepted Answer

Obeying the ideal gas law

Answer

Having a constant density

Answer

Being incompressible

Answer

Having a constant specific heat capacity

Question 17

Entropy of a system is a measure of its:

Accepted Answer

Disorder

Answer

Energy

Answer

Temperature

Question 18

A rigid vessel contains an ideal gas. Heat is added to the gas, causing its pressure to increase while its volume remains constant. Which of the following statements is true?

Accepted Answer

The internal energy of the gas increases

Answer

The specific heat capacity of the gas increases

Answer

The enthalpy of the gas decreases

Answer

The entropy of the gas remains constant

Question 19

Which of the following is a characteristic of a reversible process?

Accepted Answer

The system can be returned to its initial state without any external effects

Answer

The entropy of the system decreases

Answer

The process occurs instantaneously

Question 20

Which of the following is a dimensionless quantity representing the ratio of the specific heat capacities at constant pressure and constant volume?

Accepted Answer

Specific heat ratio

Answer

Adiabatic index

Answer

Thermal conductivity

Answer

Isothermal coefficient

Question 21

Consider a heat engine operating between two reservoirs at temperatures T1 and T2. Which of the following expressions represents the maximum possible efficiency of the engine?

Accepted Answer

1 - (T2/T1)

Answer

(T1 - T2)/T1

Answer

(T2 - T1)/T2

Answer

T1/T2