The pressure-temperature (P-T) graph for two processes, A and B, in a system is shown in the figure. If W1 and W2 are work done by the gas in process A and B respectively, then:

      

1. \(W_{1}\) = \(W_{2}\) 2. \(W_{1}\) < \(W_{2}\)
3. \(W_{1}\) > \(W_{2}\) 4. \(W_{1}\) =  \(-W_{2}\)

Subtopic:  Work Done by a Gas |
 71%
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Heat is supplied to a diatomic gas in an isochoric process. The ratio Q:U is: (symbols have usual meanings)

1. 5 : 3

2. 5: 2

3. 1: 1

4. 5: 7

Subtopic:  First Law of Thermodynamics |
 71%
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In the cyclic process shown in the pressure-volume \((P-V)\) diagram, the change in internal energy is equal to:

     

1. πP2-P122

2. πV2-V122

3. π4(P2-P1)(V2-V1)

4. zero

Subtopic:  Cyclic Process |
 73%
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If an ideal gas undergoes two processes at constant volumes V1 and V2 as shown in the pressure-temperature (P-T) diagram, then:

   

1. V1 = V2

2. V1 > V2

3. V1 < V2

4. V1V2

Subtopic:  Types of Processes |
 80%
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0.04 mole of an ideal monatomic gas is allowed to expand adiabatically so that its temperature changes from 800 K to 500 K. The work done during expansion is nearly equal to:

 

1. \(129.6\) J 2. \(-129.6\) J
3. \(149.6\) J 4. \(-149.6\) J
Subtopic:  Work Done by a Gas |
 57%
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An ideal gas goes from A to B via two processes, l and ll, as shown. If U1 and U2 are the changes in internal energies in processes I and II, respectively, then (\(P:\) pressure, \(V:\) volume)

 

1. ∆U1 > ∆U2 2. ∆U1 < ∆U2
3. ∆U1 = ∆U2 4. ∆U1 ≤ ∆U2
Subtopic:  Molar Specific Heat |
 88%
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Work done during the given cycle is:
                               
1. 4P0V0

2. 2P0V0

3. 12P0V0

4. P0V0

Subtopic:  Work Done by a Gas |
 78%
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The efficiency of an ideal heat engine is less than 100% because of:

1.  the presence of friction.
2.  the leakage of heat energy.
3.  unavailability of the sink at zero kelvin.
4.  All of these

Subtopic:  Carnot Engine |
 83%
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The first law of thermodynamics is based on:

1. the concept of temperature.
2. the concept of conservation of energy.
3. the concept of working of heat engine.
4. the concept of entropy.

Subtopic:  First Law of Thermodynamics |
 92%
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Find out the total heat given to diatomic gas in the process ABC : (BC is isothermal)
                 

1. P0V0+2P0V0 ln2

2. 12P0V0+2P0V0ln2

3. 52P0V0+2P0V0 ln2

4. 3P0V0+2P0V0 ln2

Subtopic:  First Law of Thermodynamics |
 61%
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