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

Subtopic:  Types of Processes |
 72%
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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

Subtopic:  Types of Processes |
 78%
From NCERT
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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

Subtopic:  Types of Processes |
 80%
From NCERT
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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

Subtopic:  Cyclic Process |
 65%
From NCERT
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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

Subtopic:  Cyclic Process |
 77%
From NCERT
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A cyclic process for 1 mole of an ideal gas is shown in the V-T diagram. The work done in AB, BC and CA respectively is:

  

1.  \(0, R T_2 \ln \left(\frac{V_1}{V_2}\right), R\left(T_1-T_2\right)\)  
2. \(R\left(T_1-T_2\right), 0, R T_1 \ln \frac{V_1}{V_2}\)
3. \(0, R T_2 \ln \left(\frac{V_2}{V_1}\right), R\left(T_1-T_2\right)\)
4. \(0, R T_2 \ln \left(\frac{V_2}{V_1}\right), R\left(T_2-T_1\right)\)
Subtopic:  Cyclic Process |
 55%
From NCERT
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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)

Subtopic:  Types of Processes |
 72%
From NCERT
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The Carnot cycle (reversible) of gas is represented by a pressure-volume curve as shown. 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 the statement(s) given above is/are correct?

                               

1. I only 2. II only
3. II and III 4. I, II and III
Subtopic:  Cyclic Process |
From NCERT
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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

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
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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

Subtopic:  Work Done by a Gas |
 81%
From NCERT
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