JAC Class 11 Physics MCQ Chapter-11: Thermodynamics

1. The zeroth law of thermodynamics leads to the concept of

  • Internal energy
  • Heat content
  • Pressure
  • Temperature
Answer
Pressure

2. Internal energy of an isolated system

  • Increases
  • Decreases
  • Remains the same
  • None of these
Answer
Remains the same

3. First Law of Thermodynamics leads to –

  • Conservation of mass
  • Conservation of linear momentum
  • Conservation of energy
  • Conservation of angular momentum.
Answer
Conservation of energy

4. First law of thermodynamics is the law of Conservation of –

  • Mass
  • Linear momentum
  • Energy
  • Angular momentum
Answer
Energy

5. Which of the following is conserved in the first law of thermodynamics?

  • Number of molecules
  • Energy
  • Temperature
  • Heat.
Answer
Energy

6. In the isochoric process

  • Pressure = Constant
  • Volume = Constant
  • Temperature = Constant
  • Pressure and Volume both constant
Answer
Volume = Constant

7. In the isothermal process –

  • Temperature increases
  • Temperature decreases
  • Temperature neither increases nor decreases
  • Volume remains the same
Answer
Temperature neither increases nor decreases

8. In a cyclic process, the internal energy of the gas –

  • increases
  • decreases
  • remains constant
  • becomes zero.
Answer
remains constant

9. In an isobaric process –

  • Pressure increases
  • Pressure decreases
  • Pressure neither increases or decreases (P fixed)
  • None of these.
Answer
Pressure neither increases or decreases (P fixed)

10. Find the efficiency of a Carnot’s engine working between 127°C and 27°C?

  • 35 %
  • 25 %
  • 50 %
  • 60 %
Answer
25 %

11. An adiabatic process occurs at constant –

  • Temperature
  • Pressure
  • Heat
  • None of these.
Answer
Heat

12. The efficiency of a Carnot engine depends on the temperature of –

  • Source only
  • Working substance
  • Sink only
  • Source and sink
Answer
Sink only

13. A refrigerator is –

  • an electric motor
  • a heat engine
  • a heat engine working back
  • an air cooler.
Answer
a heat engine working back

These JAC MCQs for class 11 Physics will help students prepare for the board exam. For more study materials, such as solutions, model papers, syllabus, MCQ Questions, and the latest updates on the JAC Board, please visit our website at JACBoardSolutions.com.

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