A thermodynamic system undergoes cyclic process ABCDA as shown in the figure. The work done by the system in the cycle is:

• p_o V_o

• 2 p_o V_o

• 

• zero

One 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

84.

The molar specific heats of an ideal gas at constant pressure and volume are denoted by C_P and C_V respectively. If  and R is the universal gas constant, then C_V 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 C_p/C_v for the gas is

• 4/3

• 2

• 5/3

• 5/3

When 1 kg of ice at 0^oC  melts to water 0^oC, 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