P-V plots for two gases during adiabatic process are shown in the figure. Plots 1 and 2 should correspond respectively to -

(1) He and O2

(2) O2 and He

(3) He and Ar

(4) O2 and N2

Concept Questions :-

Types of processes
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Four curves A, B, C and D are drawn in the adjoining figure for a given amount of gas. The curves which represent adiabatic and isothermal changes are -

(1) C and D respectively

(2) D and C respectively

(3) A and B respectively

(4) B and A respectively

Concept Questions :-

Types of processes
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In pressure-volume diagram given below, the isochoric, isothermal, and isobaric parts respectively are -

(1) BA, AD, DC

(2) DC, CB, DA

(3) AB, BC, CD

(4) CD, DA, AB

Concept Questions :-

Types of processes
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An ideal gas is taken through the cycle ABCA, as shown in the figure. If the net heat supplied to the gas in the cycle is 5 J, the work done by the gas in the process CA is 

(1) – 5 J

(2) – 10 J

(3) – 15 J

(4) – 20 J

Concept Questions :-

Cyclic process
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In the following indicator diagram, the net amount of work done will be

(1) Positive

(2) Negative

(3) Zero

(4) Infinity

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A cyclic process for 1 mole of an ideal gas is shown in figure in the V-T, diagram. The work done in AB, BC and CA respectively

(1) 0,RT2lnV1V2,R(T1T2)

(2) R(T1T2),0,RT1lnV1V2

(3) 0,RT2lnV2V1,R(T1T2)

(4) 0,RT2lnV2V1,R(T2T1)

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A cyclic process ABCD is shown in the P-V diagram. Which of the following P-T curves represent the same process ?

(1)

(2)

(3)

(4)

Concept Questions :-

Types of processes
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Carnot cycle (reversible) of a gas represented by a Pressure-Volume curve is shown in the diagram . Consider the following statements

I. Area ABCD = Work done on the gas

II. Area ABCD = Net heat absorbed

III. Change in the internal energy in cycle = 0

Which of these are correct ?

(1) I only

(2) II only

(3) II and III

(4) I, II and III

Concept Questions :-

First law of thermodynamics
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The temperature-entropy diagram of a reversible engine cycle is given in the figure. Its efficiency is

(1) 1/3

(2) 2/3

(3) 1/2

(4) 1/4

Concept Questions :-

Heat engine and refrigerator
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Work done in the given P-V diagram in the cyclic process is

(1) PV

(2) 2PV

(3) PV/2

(4) 3PV

Concept Questions :-

Work done by gas
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