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Q. No.

In thermodynamic processes, which of the following statements is not true?

1. In an adiabatic process, the system is insulated from the surroundings.
2. In an isochoric process, the pressure remains constant.
3. In an isothermal process, the temperature remains constant.
4. In an adiabatic process, \(P V^\gamma\) = constant.

Subtopic:  Types of Processes |
 90%
Level 1: 80%+
NEET - 2009
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A polyatomic gas \(\left(\gamma = \frac{4}{3}\right)\) is compressed to \(\frac{1}{8}\) of its volume adiabatically. If its initial pressure is \(P_0,\) its new pressure will be:

1. \(8P_0\) 2. \(16P_0\)
3. \(6P_0\) 4. \(2P_0\)
Subtopic:  Types of Processes |
 86%
Level 1: 80%+
Hints
Thermodynamic processes are indicated in the following diagram.
            
Match the following:
      Column I      Column II
\(P\).   Process-I        \(\mathrm{a}\).    Adiabatic      
\(Q\). Process-II  \(\mathrm{b}\). Isobaric
\(R\). Process-III  \(\mathrm{c}\). Isochoric
\(S\). Process-IV \(\mathrm{d}\).   Isothermal
1. \(P \rightarrow \mathrm{a}, Q \rightarrow \mathrm{c}, R \rightarrow \mathrm{d}, S \rightarrow \mathrm{b}\)
2. \(P \rightarrow \mathrm{c}, Q \rightarrow \mathrm{a}, R \rightarrow \mathrm{d}, S \rightarrow b\)
3. \(P \rightarrow \mathrm{c}, Q \rightarrow \mathrm{d}, R \rightarrow \mathrm{b}, S \rightarrow \mathrm{a}\)
4. \(P \rightarrow \mathrm{c}, Q \rightarrow \mathrm{d}, R \rightarrow \mathrm{b}, S \rightarrow \mathrm{a}\)
Subtopic:  Types of Processes |
 88%
Level 1: 80%+
NEET - 2017
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If an ideal gas undergoes two processes at constant volumes \(V_1~\text{and}~V_2\) as shown in the pressure-temperature \((P\text-T)\) diagram, then:

             
1. \(V_1= V_2\)
2. \(V_1> V_2\)
3. \(V_1< V_2\)
4. \(V_1\ge V_2\)

Subtopic:  Types of Processes |
 82%
Level 1: 80%+
Hints

Which of the following graph shows the variation of pressure P with volume V for an ideal gas at a constant temperature?

1. 2.
3. 4.
Subtopic:  Types of Processes |
 86%
Level 1: 80%+
Hints

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 |
 78%
Level 2: 60%+
AIPMT - 2005
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An ideal gas at \(27^{\circ}\text{C}\) is compressed adiabatically to \(\frac{8}{27}\) of its original volume. If \(\gamma = \frac{5}{3},\) then the rise in temperature will be:
1. \(450~\text{K}\)
2. \(375~\text{K}\)
3. \(225~\text{K}\)
4. \(405~\text{K}\)

Subtopic:  Types of Processes |
 77%
Level 2: 60%+
Hints

Can two isothermal curves cut each other?

1. Never
2. Yes
3. They will cut when the temperature is 0°C.
4. Yes, when the pressure is equal to the critical pressure.
Subtopic:  Types of Processes |
 79%
Level 2: 60%+
Hints
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. \(64P\) 2. \(32P\)
3. \(\frac{P}{64}\) 4. \(16P\)
Subtopic:  Types of Processes |
 76%
Level 2: 60%+
AIPMT - 2014
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The initial pressure and volume of a gas are \(P\) and \(V\), respectively. First, it is expanded isothermally to volume \(4V\) and then compressed adiabatically to volume \(V\). The final pressure of the gas will be: [Given: \(\gamma = 1.5\)]

1. \(P\) 2. \(2P\)
3. \(4P\) 4. \(8P\)
Subtopic:  Types of Processes |
 74%
Level 2: 60%+
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