An ideal gas undergoes four different processes from the same initial state as shown in the figure below. Those processes are adiabatic, isothermal, isobaric and isochoric. The curve which represents the adiabatic process among 1, 2, 3 and 4 is: 
        
1. 4
2. 1
3. 2
4. 3
Subtopic:  Types of Processes |
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A gas undergoes an isothermal process. The specific heat capacity of the gas in the process is:
1.  infinity
2.  0.5
3.  zero
4.  1

Subtopic:  Types of Processes |
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Two cylinders A and B of equal capacity are connected to each other via a stop cock. A contains an ideal gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. The stop cock is suddenly opened. The process is : 

1. adiabatic 

2. isochoric 

3. isobaric 

4. isothermal 

Subtopic:  Types of Processes |
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The efficiency of a Carnot engine depends upon:

1. the temperature of the sink only.

2. the temperatures of the source and the sink.

3. the volume of the cylinder of the engine.

4. the temperature of the source only.

Subtopic:  Heat Engine & Refrigerator |
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The P-V diagram for an ideal gas in a piston-cylinder assembly undergoing a thermodynamic process is shown in the figure. The process is:

     

1.  adiabatic 

2.  isochoric

3.  isobaric 

4.  isothermal 

Subtopic:  Types of Processes |
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In which of the following processes, the heat is neither absorbed nor released by a system?

1. Isochoric

2. Isothermal

3. Adiabatic

4. Isobaric

Subtopic:  Types of Processes |
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1 g of water of volume 1 cm3 at 100 °C is converted into steam at the same temperature under normal atmospheric pressure1×105 Pa. The volume of steam formed equals 1671 cm3. If the specific latent heat of vaporization of water is 2256 J/g, the change in internal energy is:

1. 2423 J

2. 2089 J

3. 167 J

4. 2256 J

Subtopic:  First Law of Thermodynamics |
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A sample of 0.1 g of water at 1000 C and normal pressure (1.013 × 105 Nm–2) requires 54 cal of heat energy to convert it into steam at 1000 C. If the volume of the steam produced is 167.1 cc, then the change in internal energy of the sample will be:

1. 104.3 J

2. 208.7 J

3. 42.2 J

4. 84.5 J

Subtopic:  First Law of Thermodynamics |
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The volume (V) of a monatomic gas varies with its temperature (T), as shown in the graph. The ratio of work done by the gas to the heat absorbed by it when it undergoes a change from state A to state B will be:
         

1. 25

2. 23

3. 13

4. 27

Subtopic:  Molar Specific Heat |
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The efficiency of an ideal heat engine working between the freezing point and boiling point of water is:

1. 26.8%

2. 20%

3. 6.25%

4. 12.5%

Subtopic:  Heat Engine & Refrigerator |
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