When volume changes from \(V\) to \(2V\) at constant pressure(\(P\)), the change in internal energy will be:
1. \(PV\)
2. \(3PV\)
3. \(\frac{PV}{\gamma -1}\)
4. \(\frac{RV}{\gamma -1}\)

Subtopic:  Molar Specific Heat |
 71%
From NCERT
AIPMT - 1998
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If a gas changes volume from 2 litres to 10 litres at a constant temperature of 300K, then the change in its internal energy will be:

1. 12 J 2. 24 J
3. 36 J 4. 0 J
Subtopic:  Molar Specific Heat |
 85%
From NCERT
AIPMT - 1998
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We consider a thermodynamic system. If ∆U represents the increase in its internal energy and W the work done by the system, which of the following statements is true?

1.  \(\Delta \mathrm{U}=-\mathrm{W}\)  in an isothermal process
2. \(\Delta \mathrm{U}=\mathrm{W}\) in an isothermal process
3. \(\Delta \mathrm{U}=-\mathrm{W}\) in an adiabatic process
4. \(\Delta \mathrm{U}=\mathrm{W}\)  in an adiabatic process      
Subtopic:  First Law of Thermodynamics |
 83%
From NCERT
AIPMT - 1998
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The initial pressure and volume of a gas are P and V respectively. First, its volume is expanded to 4V by an isothermal process and then compressed adiabatically to volume V. The final pressure will be (γ = 1.5):
1.  8P
2.  4P
3.  P
4.  2P

Subtopic:  Types of Processes |
 69%
From NCERT
AIPMT - 1999
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One mole of an ideal gas at an initial temperature of \(T\) K does \(6R\) joules of work adiabatically. If the ratio of specific heats of this gas at constant pressure and at constant volume is \(5/3\), the final temperature of the gas will be:
1. \((T-2.4)\) K
2. \((T+4)\) K
3. \((T-4)\) K
4. \((T+2.4)\) K

Subtopic:  First Law of Thermodynamics |
 56%
From NCERT
AIPMT - 2004
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Which one of the following processes is reversible?

1.  Transfer of heat by radiation
2. Transfer of heat by conduction
3. Isothermal compression
4. Electrical heating of a nichrome wire


 

Subtopic:  Types of Processes |
 76%
From NCERT
AIPMT - 2005
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An ideal gas heat engine operates in a Carnot cycle between 227ºC and 127ºC. It absorbs 6 × 104 cals of heat at higher temperatures. The amount of heat converted to work will be?
1. 4.8 × 104 cals
2. 2.4 × 104 cals
3. 1.2 × 104 cals
4. 6 × 104 cals

Subtopic:  Carnot Engine |
 74%
From NCERT
AIPMT - 2005
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