One mole of an ideal diatomic gas undergoes a transition from A to B along a path AB as shown in the figure.

The change in internal energy of the gas during the transition is

(a) 20 kJ

(b) -20 kJ

(c) 20 J

(d) -12 kJ

Concept Questions :-

Molar Specific heat
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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?

(a) Adiabatic

(b) Isobaric

(c) Isochoric

(d) Isothermal

Concept Questions :-

Work done by gas
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The coefficient of performance of a refrigerator is 5. If the temperature inside freezer is -20°C, the temperature of the surroundings to which it rejects heat is  -

(a)31°C

(b)41°C

(c)11°C

(d)21°C

Concept Questions :-

Heat engine and refrigerator
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A thermodynamic system undergoes cyclic process ABCDA as shown in figure. The work done by the system in the cycle is



(a) ρoV

(b) 2ρoVo

(c) ρoVo/2

(d)zero

Concept Questions :-

Cyclic process
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A gas is taken through the cycle A→B→C→A, as shown. What is the net work done by the gas?

(a)2000J

(b)1000J

(c)Zero

(d)-2000J

Concept Questions :-

Work done by gas
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During an adiabatic process. the pressure of a gas is found to be proportional to the cube of its
temperature. The ratio of CP/CV for the gas is

(a) 4/3

(b) 2

(c) 5/3

(d) 3/2

Concept Questions :-

Molar Specific heat
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A thermodynamic system is taken through the cycle ABCD as shown in figure. Heat rejected by the gas during the cycle is 

(a)2 pV                                     (b)4 pV

(c)12pV                                    (d)pV

Concept Questions :-

First law of thermodynamics
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One mole of an ideal gas from an initial state B undergoes 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 -

Concept Questions :-

Types of processes
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An ideal gas goes from state A to state B

via three different processes as indicated 

in the p-V diagram

If Q1, Q2, Q3 indicates the heat absorbed

by the gas along the three processes and 

U1, U2, U3 indicates the change in 

internal energy along the three processes

respectively, then

(a) Q1>Q2>Q3 and U1= U2= U3

(b) Q3>Q2>Q1 and U1= U2= U3

(c) Q1=Q2=Q3 and U1>U2>U3

(d) Q3>Q2>Q1 and U1>U2>U3

Concept Questions :-

First law of thermodynamics
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A mass of diatomic gas (γ=1.4) at a pressure of 2 atm is compressed adiabatically so that its temperature rise from 27°C to 927°C. The pressure of the gas is final state is-

(a) 28 atm                                            (b) 68.7 atm

(c) 256 atm                                           (d) 8 atm

Concept Questions :-

Types of processes
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