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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The P-V graph of an ideal gas cycle is shown here as below. The adiabatic process is described by

(1) AB and BC

(2) AB and CD

(3) BC and DA

(4) BC and CD

Subtopic:  Types of Processes |
 76%
From NCERT
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An ideal monoatomic gas is taken round the cycle  as shown in following P-V diagram. The work done during the cycle is -

(1) PV

(2) 2 PV

(3) 4 PV

(4) Zero

Subtopic:  Work Done by a Gas |
 78%
From NCERT
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A system changes from the state (P1, V1) to (P2, V2) as shown in the figure. What is the work done by the system ?

(1) 7.5 × 105 joule

(2) 7.5 × 105 erg

(3) 12 × 105 joule

(4) 6 × 105 joule

Subtopic:  Work Done by a Gas |
 77%
From NCERT
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Carbon monoxide is carried around a closed cycle abc in which bc is an isothermal process as shown in the figure. The gas absorbs 7000 J of heat as its temperature increases from 300 K to 1000 K in going from a to b. The quantity of heat rejected by the gas during the process ca is -

(1) 4200 J

(2) 5000 J

(3) 9000 J

(4) 9800 J

Subtopic:  Cyclic Process |
From NCERT
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