### Thermodynamics (Ideal and Real Gases)

Choose the Correct Answer :

1. (a) A perfect gas does not obey the law
pv = RT

(b) A perfect gas obeys the law pv = RT and
has constant specific heat

(c) A perfect gas obeys the law pv = RT but
have variable specific heat capacities.

2. Boyle’s law states that, when
temperature is constant, the volume of a given mass of a perfect gas

(a) varies directly as the absolute
pressure

(b) varies inversely as the absolute
pressure

(c) varies as square of the absolute
pressure

(d) does not vary with the absolute
pressure.

3. Charle’s law states that if any gas is
heated at constant pressure, its volume

(a) changes directly as it absolute
temperature

(b) changes inversely as its absolute
temperature

(c) changes as square of the absolute
temperature

(d) does not change with absolute
temperature.

4. The equation of the state per kg of a
perfect gas is given by

(a) p2v = RT

(b) pv = RT

(c) pv

^{2}= RT
(d) p

^{2}v^{2}= RT.
where p, v, R and T are the pressure, volume,
characteristic gas constant and temperature of the gas respectively.

5. The equation of state of an ideal gas is
a relationship between the variables :

(a) pressure and volume

(b) pressure and temperature

(c) pressure, volume and temperature

(d) none of the above.

6. Joule’s law states that the specific
internal energy of a gas depends only on

(a) the pressure of the gas

(b) the volume of the gas

(c) the temperature of the gas

(d) none of the above.

7. Equation for specific heat at constant
pressure of an ideal gas is given by

(a) c

_{p}= a + KT + K_{1}T2 + K_{2}T^{3}
(b) c

_{p}= a + KT^{2}+ K_{1}T3 + K_{2}T^{4}
(c) c

_{p}= a + KT^{2}+ K_{1}T4 + K_{2}T
(d) c

_{p}= a + KT^{2}+ K_{1}T^{3}+ K_{2}T^{2}.
where a, K, K

_{1}and K_{2}are constants.**Answers**

1. (b) 2. (b) 3. (a) 4. (b) 5. (c) 6. (c) 7.
(a)

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