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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The work done by an ideal diatomic gas in its sudden expansion is 20 J. The change in the internal energy of the gas will be:

1. 20 J

2. 0 J

3. -20 J

4. -15 J

Subtopic:  First Law of Thermodynamics |
 73%
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A heat engine is working between 200 K and 400 K. The efficiency of the heat engine may be:

1. 20%

2. 40%

3. 50%

4. All of these

Subtopic:  Carnot Engine |
 52%
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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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The internal energy of an ideal gas increases in:

1. Adiabatic expansion

2. Adiabatic compression

3. Isothermal expansion

4. Isothermal compression

Subtopic:  First Law of Thermodynamics |
 61%
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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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Which of the following is true for the molar heat capacity of an ideal gas?

1. It cannot be negative.
2. It has only two values \(\left(C_P \text { and } C_V\right)\).
3. It can have any value.
4. It cannot be zero.

Subtopic:  Molar Specific Heat |
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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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When a system is moved from state a to state b along the path acb, it is discovered that the system absorbs 200 J of heat and performs 80 J of work.  Along the path adb, heat absorbed Q = 144 J. The work done along the path adb is:

 

1. 6 J 2. 12 J
3. 18 J 4. 24 J
Subtopic:  First Law of Thermodynamics |
 85%
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The variation of molar heat capacity at constant volume CV with temperature T for a monatomic gas is:

1. 2.
3. 4.
Subtopic:  Molar Specific Heat |
 53%
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