ABCA is a cyclic process. Its P-V graph would be:

   

1. 2.
3. 4.

Subtopic:  Cyclic Process |
 74%
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If the ratio of specific heat of a gas at constant pressure to that at constant volume is γ, the change in internal energy of a mass of gas, when the volume changes from V to 2V at constant pressure, P is:

1. R/γ-1 2. PV
3. PV/γ-1 4. PVγ-1
Subtopic:  Molar Specific Heat |
 80%
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The degree of freedom per molecule for a gas on average is 8. If the gas performs 100 J of work when it expands under constant pressure, then the amount of heat absorbed by the gas is:
1. 500 J
2. 600 J
3. 20 J
4. 400 J

Subtopic:  First Law of Thermodynamics |
 61%
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The pressure in a monoatomic gas increases linearly from 4 atm to 8 atm when its volume increases from 0.2 m3 to 0.5 m3. The increase in internal energy will be:

1. 480 kJ 2. 550 kJ
3. 200 kJ 4. 100 kJ
Subtopic:  Molar Specific Heat |
 66%
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If in the thermodynamic process shown in the figure, the work done by the system along A  C is 50 J and the change in internal energy during C  A is 30 J, then the heat supplied during A  C is:

         

1. 50 J  2. 20 J
3. 10 J  4. 80 J
Subtopic:  Cyclic Process |
 52%
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In the P-V diagram shown, the gas does 5 J of work in the isothermal process ab and 4 J in the adiabatic process bc. What will be the change in internal energy of the gas in the straight path from c to a? 


1. 9J 

2. 1 J

3. 4 J 

4. 5 J

Subtopic:  Cyclic Process |
 56%
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A horizontal cylinder has two sections of unequal cross-sections in which two pistons, A and B, can move freely. The pistons are joined by a string. Some gas is trapped between the pistons. If this gas is heated, the pistons will:  
         

1. move to the left.
2. move to the right.
3. remain stationary.
4. move either to the left or to the right depending on the initial pressure of the gas.

Subtopic:  First Law of Thermodynamics |
 52%
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The pressure of a monoatomic gas increases linearly from 4×105 N/m2 to 8×105 N/m2 when its volume increases from 0.2 m3 to 0.5 m3. The work done by the gas is:

1. 2.8×105 J

2. 1.8×106 J

3. 1.8×105 J

4. 1.8×102 J

Subtopic:  Work Done by a Gas |
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An ideal gas is taken through the cycle ABCA as shown in figure below. If the net heat supplied to the gas is 10 J, then the work done by the gas in the process BC is

                

1. -10 J 2. -30 J
3. -15 J 4. -20 J
Subtopic:  Cyclic Process |
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One mole of an ideal gas expands at a constant temperature of 300 K from an initial volume of 10 litres to a final volume of 20 litres. The work done in expanding the gas is equal to:
(R = 8.31 J/mole-K)

1. 750 joules

2. 1728 joules

3. 1500 joules

4. 3456 joules

Subtopic:  Work Done by a Gas |
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