CBSE
Multiple Choice QuestionsOne mole of an ideal gas goes from an initial state A to final state B via two processes. It first undergoes isothermal expansion from volume V to 3V and then its volume is reduced from 3V to V at constant pressure. The correct p-V diagram representing the two processes is
A thermodynamic system is taken through the cycle ABCD as shown in a figure. Heat rejected by the gas during the cycle is
2 pV
4 pV
1/2 pV
1/2 pV
The molar specific heats of an ideal gas at constant pressure and volume are denoted by CP and CV respectively. If 
and R is the universal gas constant, then CV is equal to
A gas is taken through the cycle A → B → C → A, as shown, What is the net work done by the gas?
2000 J
1000 J
Zero
Zero
During an adiabatic process, the pressure of a gas found to be proportional to the cube of its temperature. The ratio of Cp/Cv for the gas is
4/3
2
5/3
5/3
When 1 kg of ice at 0oC melts to water 0oC, the resulting change in its entropy, taking latent heat of ice to be 80 cal/oC, is
8 x 104 cal /K
80 cal/K
293 cal/ K
293 cal/ K
During an isothermal expansion, a confined ideal gas does - 150 J of work against its surroundings. This implies that
300 J of heat has been added to the gas
no heat is transferred because the process is isothermal
150 J of heat has been added to the gas
150 J of heat has been added to the gas
4.0 g of a gas occupies 22.4 L at NTP. The specific heat capacity of the gas at constant volume is 5.0 JK-1 mol-1. If the speed of sound in this gas at NTP is 952 ms-1, then the heat capacity at constant pressure is.
(Take gas constant R = 8.3 Jk-1 mol-1)
8.0 JK-1mol-1
7.5 JK-1mol-1
7.0 JK-1mol-1
7.0 JK-1mol-1
An ideal gas is compressed to half its initial volume by means of several process. Which of the process results in the maximum work done on the gas?
Adiabatic
Isobaric
Isochoric
Isochoric
A mass of diatomic gas 
at a pressure of 2 atm is compressed adiabatically so that its temperature rise from 27oC to 927o C. The pressure of the gas is final state is
28 atm
68.7 atm
256 atm
256 atm
