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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A gas is compressed isothermally to half its initial volume. The same gas is compressed separately through an adiabatic process until its volume is again reduced to half. Then,

1. compressing the gas through an adiabatic process will require more work to be done.
2. compressing the gas isothermally or adiabatically will require the same amount of work.
3. which of the case (whether compression through isothermal or through the adiabatic process) requires more work will depend upon the atomicity of the gas.
4. compressing the gas isothermally will require more work to be done.

Subtopic:  Types of Processes |
 71%
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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The figure below shows two paths that may be taken by gas to go from state \(A\) to state \(C\)
             
In process \(AB\), \(400~\text{J}\) of heat is added to the system, and in process \(BC\), \(100~\text{J}\) of heat is added to the system. The heat absorbed by the system in the process \(AC\) will be:
1. \(380~\text{J}\)
2. \(500~\text{J}\)
3. \(460~\text{J}\)
4. \(300~\text{J}\)

Subtopic:  First Law of Thermodynamics |
 58%
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 |
 74%
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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During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its temperature. The ratio of \(\frac{C_P}{C_V}\) for the gas is:
1. \(2\)
2. \(5/3\)
3. \(3/2\)
4. \(4/3\)
Subtopic:  Types of Processes |
 71%
From NCERT
AIPMT - 2013
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A thermodynamic system is taken through the cycle \(\mathrm{ABCD}\) as shown in the figure. Heat rejected by the gas during the cycle is: 
     

1. \(2 {PV}\)
2. \(4{PV}\)
3. \(\frac{1}{2}{PV}\)
4. \(PV\)

Subtopic:  Cyclic Process |
 74%
From NCERT
AIPMT - 2012
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