ह

4.

Maximum : 100 marks

Time : 1 hour and 15 minutes

An ideal gas of mass m and temperature T, undergoes a reversible isothermal process from
an ಚರು pressure p, to final pressure p,. The heat loss during the process is Q.
The entropy change of the gas is :

(ക) mRIn(py!p) @) mRIn(p / ಗ)

(01 1 (D) zero

Heat and work are :
(^) Path functions (ए) Intensive properties
(C) Point functions (D) None of the above

1f a closed system is undergoing an irreversible process, the entropy of the system :
(ಗಿ) Must decrease B) 2५५

(C) Must increase (D) Remain constant

A gas contained in a cylinder is compressed; the work required for compression is 3000 kd.
During the process, heat interaction വ്‌ 500 161 causes the surroundings to be heated. The
changes in internal energy of the gas during the process is :

(५) 500kJ ட -3500kJ
(८) +8800 व യു 25001

A 2000 W, 25 litexs water heater is switched on for 30 minutes. The heat capacity ¢, for

water is 4.2 kJ/kgK. Assuming all the electrical energy has gone for heating the water,
increase of the water temperature in degree centigrade is :

(ಗ) 10.7 (2) 8
(C) 3 (D) 44.8

A positive value of Joule-Thomson coefficient of a fluid means :
(2) Temperature drops during throttling
(B) Temperature remains constant
(C) Temperature rises during throttling
(D) None of the above

[P.T.0.]