Thermodynamics (First Law of Thermodynamics)

1.         In isothermal process
(a) temperature increases gradually
(b) volume remains constant
(c) pressure remains constant
(d) enthalpy change is maximum
(e) change in internal energy is zero.

2.         During throttling process
(a) internal energy does not change
(b) pressure does not change
(c) entropy does not change
(d) enthalpy does not change
(e) volume change is negligible.

3.         When a gas is to be stored, the type of compression that would be ideal is
(a) isothermal
(b) adiabatic
(c) polytropic
(d) constant volume
(e) none of the above.

4.         If a process can be stopped at any stage and reversed so that the system and surroundings are exactly restored to their initial states, it is known as
(a) adiabatic process
(b) isothermal process
(c) ideal process
(d) frictionless process
(e) energy less process.

5.         The state of a substance whose evaporation from its liquid state is complete, is known as
(a) vapour
(b) perfect gas
(c) air
(d) steam.

6.         In SI units, the value of the universal gas constant is
(a) 0.8314 J/mole/K
(b) 8.314 J/mole/K
(c) 83.14 J/mole/K
(d) 831.4 J/mole/K
(e) 8314 J/mole/K.

7.         When the gas is heated at constant pressure, the heat supplied
(a) increases the internal energy of the gas
(b) increases the temperature of the gas
(c) does some external work during expansion
(d) both (b) and (c)
(e) none of the above.

8.         The gas constant (R) is equal to the
(a) sum of two specific heats
(b) difference of two specific heats
(c) product of two specific heats
(d) ratio of two specific heats.

Answers:
1. (e)
2. (d)
3. (a)
4. (c)
5. (b)
6. (e)
7. (d)
8. (b)

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