| 1 |
The difference between tow molar capacities is equal to. |
- A. Plank's constant
- B. General gas equation
- C. Molar gas constant
- D. Boltzmann constant
|
| 2 |
An ideal heat engine can only be 100% efficient if its cold temperature reservoir is at. |
- A. 0 K
- B. 0 <sup>o</sup>C
- C. 100 K
- D. 100 <sup>o</sup>C
|
| 3 |
When temperature of source and sink of a heat engine becomes equal then the entropy change will be. |
- A. zero
- B. Minimum
- C. Maximum
- D. Negative
|
| 4 |
The kinetic energy of molecules of an ideal gas at absolute zero is |
- A. Very low
- B. Very high
- C. Zero
- D. First increases then decreases
|
| 5 |
Pressure 'P' of a gas is defined as |
- A. F/A
- B. FA
- C. F/V
- D. F/D
|
| 6 |
If heat engine absorb 400 J and rejects 200 J heat energy, its efficiency will be. |
- A. 25%
- B. 50%
- C. 70%
- D. 100%
|
| 7 |
For working of heat engine, there must be |
- A. A source
- B. A sink
- C. Ether of these
- D. Both of them
|
| 8 |
Which of following is irreversible process |
- A. Slow compression of an elastic spring
- B. Slow evaporation of substances in isolated vessel
- C. Slow expansion of a gas
- D. A chemical explosion
- E. <br>
|
| 9 |
The efficiency of diesel engine is about |
- A. 25 % to 30%
- B. 35% to 40%
- C. 40% to 50%
- D. 50% to 60%
|
| 10 |
The temperature of human body on Kelvin scale is |
- A. 210K
- B. 310K
- C. 410K
- D. 510K
|