1. The zeroth law of thermodynamics leads to the concept of
- Internal energy
- Heat content
- Pressure
- Temperature
2. Internal energy of an isolated system
- Increases
- Decreases
- Remains the same
- None of these
3. First Law of Thermodynamics leads to –
- Conservation of mass
- Conservation of linear momentum
- Conservation of energy
- Conservation of angular momentum.
4. First law of thermodynamics is the law of Conservation of –
- Mass
- Linear momentum
- Energy
- Angular momentum
5. Which of the following is conserved in the first law of thermodynamics?
- Number of molecules
- Energy
- Temperature
- Heat.
6. In the isochoric process
- Pressure = Constant
- Volume = Constant
- Temperature = Constant
- Pressure and Volume both constant
7. In the isothermal process –
- Temperature increases
- Temperature decreases
- Temperature neither increases nor decreases
- Volume remains the same
8. In a cyclic process, the internal energy of the gas –
- increases
- decreases
- remains constant
- becomes zero.
9. In an isobaric process –
- Pressure increases
- Pressure decreases
- Pressure neither increases or decreases (P fixed)
- None of these.
10. Find the efficiency of a Carnot’s engine working between 127┬░C and 27┬░C?
- 35 %
- 25 %
- 50 %
- 60 %
11. An adiabatic process occurs at constant –
- Temperature
- Pressure
- Heat
- None of these.
12. The efficiency of a Carnot engine depends on the temperature of –
- Source only
- Working substance
- Sink only
- Source and sink
13. A refrigerator is –
- an electric motor
- a heat engine
- a heat engine working back
- an air cooler.