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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A cyclic process ABCA is shown in the V-T diagram. Process on the P-V diagram is -

(1)

(2)

(3)

(4)

Subtopic:  Types of Processes |
 68%
From NCERT
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The heat energy absorbed by a system is going through a cyclic process shown in the figure is:

(1) 107 π J

(2) 104 π J

(3) 10π J

(4) 10–3π J

Subtopic:  Cyclic Process |
 66%
From NCERT
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A thermodynamic system is taken from state A to B along ACB and is brought back to A along BDA as shown in the PV diagram. The net work done during the complete cycle is given by the area

(1) P1ACBP2P1

(2) ACBB'A'A

(3) ACBDA

(4) ADBB'A'A

Subtopic:  Work Done by a Gas |
 77%
From NCERT
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In the diagrams (i) to (iv) , variation of volume with changing pressure is shown. A gas is taken along the path ABCDA. The change in internal energy of the gas will be

(1) Positive in all cases (i) to (iv)

(2) Positive in cases (i), (ii) and (iii) but zero in (iv) case

(3) Negative in cases (i), (ii) and (iii) but zero in (iv) case

(4) Zero in all four cases

Subtopic:  Cyclic Process |
 86%
From NCERT
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