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 \(\mathrm{A}\) to state \(\mathrm{B}\) will be:
           

1. \(2 \over 5\) 2. \(2 \over 3\)
3. \(1 \over 3\) 4. \(2 \over 7\)

Subtopic:  Molar Specific Heat |
 65%
From NCERT
NEET - 2018
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The efficiency of an ideal heat engine (Carnot 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:  Carnot Engine |
 77%
From NCERT
NEET - 2018
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Assertion Thermodynamic process in nature are irreversible. 
Reason Dissipative effects cannot be eliminated.
 

1.  If both assertion and reason are true and reason explain the assertion.
2.  If both the assertion and reason are true but reason does not explain the assertion.
3.  If assertion is true but reason is false.
4.  If assertion is false but reason is true.

Subtopic:  Second Law of Thermodynamics |
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A refrigerator works between 40C and 300C. It is required to remove 600 calories of heat every second to keep the temperature of the refrigerated space constant. The power required will be: 
(Take, 1 cal= 4.2 Joules)
1. 23.65 W
2. 236.5 W
3. 2365 W
4. 2.365 W
Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 74%
From NCERT
NEET - 2016
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An ideal gas is compressed to half its initial volume using several processes. Which of the processes results in the maximum work done on the gas?
1. adiabatic
2. isobaric
3. isochoric
4. isothermal

Subtopic:  Work Done by a Gas |
 70%
From NCERT
NEET - 2015
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A Carnot engine, having an efficiency of η110 as a heat engine, is used as a refrigerator. If the work done on the system is \(10\) J, the amount of energy absorbed from the reservoir at a lower temperature is:
1. \(100\) J
2. \(99\) J
3. \(90\) J
4. \(1\) J

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 74%
From NCERT
NEET - 2015
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A monoatomic gas at a pressure \(P\), having a volume \(V\), expands isothermally to a volume \(2V\) and then adiabatically to a volume \(16V\). The final pressure of the gas is: \(\left(\text{Take:}~ \gamma = \frac{5}{3} \right)\)


1. \(64 ~P\)
2. \(32~P\)
3. \(\frac{P}{64}\)
4. \(16~P\)
Subtopic:  Types of Processes |
 74%
From NCERT
AIPMT - 2014
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A thermodynamic system undergoes a cyclic process \(ABCDA\) as shown in Fig. The work done by the system in the cycle is: 
             
1. \( P_0 V_0 \)
2. \( 2 P_0 V_0 \)
3. \( \frac{P_0 V_0}{2} \)
4. zero

Subtopic:  Cyclic Process |
 81%
From NCERT
AIPMT - 2014
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A gas is taken through the cycle \(A\rightarrow B\rightarrow C\rightarrow A\), as shown. What is the total amount of work done by the gas?
               
1. \(1000~\text{J}\) 2. zero
3. \(-2000~\text{J}\) 4. \(2000~\text{J}\)
Subtopic:  Work Done by a Gas |
 75%
From NCERT
AIPMT - 2013
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The molar specific heats of an ideal gas at constant pressure and volume are denoted by \(C_P\) and \(C_V,\) respectively. If \(\gamma =\frac{C_p}{C_V}\) and \(R\) is the universal gas constant, then \(C_V\) is equal to:
1. \(\frac{R}{\gamma -1}\) 2. \(\frac{\gamma -1}{R}\)
3. \(\gamma R \) 4. \(\frac{\left ( \gamma -1 \right )R}{\left ( \gamma +1 \right )}\)
Subtopic:  Molar Specific Heat |
 88%
From NCERT
AIPMT - 2013
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