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 |
70%
From NCERT
AIPMT - 1998
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NEET 2023 - Target Batch - Aryan Raj Singh
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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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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

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 |
70%
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 |
55%
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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NEET 2023 - Target Batch - Aryan Raj Singh

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 |
73%
From NCERT
AIPMT - 2005
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh