Thermodynamics MCQ Questions and Answers for Practice

1. What is the name of the following statement: “When two systems are in thermal equilibrium with a third system, then they are in thermal equilibrium with each other”?

1. First Law of Thermodynamics
2. Second Law of Thermodynamics
3. Mechanical equivalent of heat
4. Zeroth Law of Thermodynamics

2. An aluminum plate has a circular hole. If the temperature of the plate increases, what happens to the size of the hole?

1. Increases
2. Decreases
3. Stays the same
4. Increases the top half of the hole

3. Which of the following temperature scales doesn’t have negative numbers?

1. Celsius
2. Kelvin
3. Reaumur
4. Fahrenheit

4. A container filled with a sample of an ideal gas at the pressure of 1.5 atm. The gas is compressed isothermally to one-fourth of its original volume. What is the new pressure of the gas?

1. 3 atm
2. 4 atm
3. 5 atm
4. 6 atm

5. A container with rigid walls filled with a sample of ideal gas. The absolute temperature of the gas is doubled. What happens to the pressure of the gas?

1. Doubles
2. Quadruples
3. Triples
4. Decreased to one-half

6. The absolute temperature of an ideal diatomic gas is quadrupled. What happens to the average speed of molecules?

1. Quadruples
2. Doubles
3. Triples
4. Increases by a factor of 1.41

7. The average molecular kinetic energy of a gas depends on:

1. Pressure
2. Volume
3. Temperature
4. Number of moles

8. Kinetic Theory is based on an ideal gas model. The following statements about the ideal gas are true EXCEPT:

1. The average molecular kinetic energy is directly proportional to the absolute temperature
2. All molecules move with the same speed
3. All molecules make elastic collisions with each other and the walls of the container
4. The attractive force between the molecules can be ignored

9. A sample of ideal gas has an internal energy U and is then compressed to one-half of its original volume while the temperature stays the same. What is the new internal energy of the ideal gas in terms of U?

1. U
2. 1/2U
3. 1/4U
4. 2U

10. An ideal gas with an internal energy U initially at 0 °C is heated to 273 °C. What is the new internal energy in terms of U?

1. U
2. 1/2U
3. 1/4U
4. 2U

11. Mechanical equivalent is associated with:

1. Newton
2. Kelvin
3. Joule
4. Boltzmann

12. A silver tea spoon is placed in a cup filled with hot tea. After some time, the exposed end of the spoon becomes hot even without a direct contact with the liquid. This phenomenon can be explained by:

1. Thermal expansion
2. Conduction
3. Convection
4. Radiation

13. The process of heat transfer from object to another because of molecular motion and interaction is called:

1. Convection
2. Conduction
3. Radiation
4. Induction

14. When we touch a piece of metal and a piece of wood that are placed in the same room, the piece of metal feels much colder than the piece of wood. This happens because of the difference in:

1. Specific heat
2. Temperature
3. Density
4. Thermal conductivity

15. The process of heat transfer by the movement of mass from one place to another is called:

1. Convection
2. Conduction
3. Radiation
4. Induction