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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A sample of ideal monoatomic gas is taken round the cycle CBAC as shown in the figure. The work done during the cycle is 

(1) Zero

(2) 3 PV

(3) 6 PV

(4) 9PV

Subtopic:  Work Done by a Gas | Cyclic Process |
 78%
From NCERT
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When a system is taken from state i to a state f along path iaf, Q = 50 J and W = 20 J.

 If W = –13 J for the curved return path fi, Q for this path is -

1. 33 J

2. 23 J

3. – 7 J

4. – 43 J

Subtopic:  First Law of Thermodynamics |
 69%
From NCERT
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Which one of the following is correct for one complete cycle of a thermodynamic process on a gas as shown in the \((P-V)\) diagram?

      

1. \(\Delta E_{int}= 0, Q<0\) 2. \(\Delta E_{int}= 0, Q>0\)
3. \(\Delta E_{int}>0, Q<0\) 4. \(\Delta E_{int}< 0, Q>0\)
Subtopic:  Cyclic Process |
 68%
From NCERT
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An ideal gas is taken from point A to the point B, as shown in the P-V diagram. The work done in the process is -

1. (PAPB)(VBVA)

2. 12(PBPA)(VB+VA)

3. 12(PBPA)(VBVA)

4. 12(PB+PA)(VBVA)

Subtopic:  Work Done by a Gas |
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The P-V diagram of a system undergoing thermodynamic transformation is shown in figure. The work done by the system in going from AB C is 30J and 40J heat is given to the system. The change in internal energy between A and C is

(1) 10 J

(2) 70 J

(3) 84 J

(4) 134 J

Subtopic:  First Law of Thermodynamics |
 70%
From NCERT
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