1. A Carnot engine whose sink is at 300 K has an efficiency of 40%. By how much should the temperature of source be increased, so as to increase its efficiency by 50% of original efficiency?

2. During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratio Cp/Cv for the gas is

3. For a diatomic gas change in internal energy for a unit change in temperature for constant pressure and constant volume is U1 and U2 respectively. What is the ratio of U1 and U2?

4. If an average person jogs, he produces 14.5 × 10³ cal/min. This is removed by the evaporation of sweat. The amount of sweat evaporated per minute is assuming 1 kg requires 580 × 10³ cal for evaporation

5. Which of the following parameters dose not characterize the thermodynamic state of matter?

6. Thermodynamics is concerned with the

7. Which of the following statements is correct for any thermodynamic system?

8. Tell which of the following phenomenon are reversible?

9. Sometimes a cycle with well inflated tyres left in the Sun has its tube burst open. This is because the

10. In a Carnot’s engine, at the end point of the cycle, the temperature is

11. Heat cannot by itself flow from a body at lower temperature to a body at higher temperature is a statement as a conseqence of

12. A thermodynamical system is changed from state (P¹, V¹) to (P², V²) by two different processes, the quantity which will remain same is:

13. Tell which of the following phenomenon are reversible?

14. Internal energy of a perfect gas is

15. The translational kinetic energy of gas molecules at temperature T for one mole of a gas is

16. The first law of thermodynamics is represented as

17. In a thermodynamic process, pressure of a fixed mass of the gas is changed in such a manner that the gas molecules give out 30 J of heat. Also, 10 J of work is done on the gas. If the internal energy of the gas was 40 J, what will be the final internal energy?

18. In an isothermal process, the internal energy of the system

19. The efficiency of a Carnot engine working between 227°C and 27°C is

20. The temperatures of inside and outside of a refrigerator are 273 K and 303 K respectively. Assuming, that the refrigerator cycle is reversible, for every joule of work done, the heat delivered to the surrounding will be nearly: