Thermodynamic Processes
PHXI12:THERMODYNAMICS

371465 During an adiabatic expansion, the increase in volume is associated with which of the following possibilities regarding pressure and temperature ?
\(\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{Pressure}}{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} \,\,{\mkern 1mu} \,\,{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\rm{Temperature}}\)

1 \[\begin{array}{*{20}{c}}
{{\rm{Increase}}}&{\,{\rm{Increase}}}
\end{array}\]
2 \[\begin{array}{*{20}{c}}
{{\rm{Decrease}}}&{{\rm{Decrease}}}
\end{array}\]
3 \[\begin{array}{*{20}{c}}
{{\rm{Increase}}}&{{\rm{Decrease}}}
\end{array}\]
4 \[\begin{array}{*{20}{c}}
{{\rm{Decrease}}}&{\,{\rm{Increase}}}
\end{array}\]
PHXI12:THERMODYNAMICS

371466 In a thermodynamic system, ' \(W\) ' represents the work done by the system and ' \(\Delta U\) ' is the increase in internal energy. Which of the following statements is true?

1 In an isothermal process, \(\Delta U=W\)
2 In an adiabatic process, \(\Delta U=-W\)
3 In an isothermal process, \(\Delta U=-W\)
4 In an adiabatic process, \(\Delta U=W\).
PHXI12:THERMODYNAMICS

371467 During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its temperature. The ratio of \(\dfrac{C_{P}}{C_{V}}\) for the gas is

1 \(\dfrac{4}{3}\)
2 \(2\)
3 \(\dfrac{5}{3}\)
4 \(\dfrac{3}{2}\)
PHXI12:THERMODYNAMICS

371468 Assertion :
Air quickly leaking out of a balloon becomes cooler.
Reason :
The leaking air undergoes adiabatic expansion

1 Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.
3 Both Assertion and Reason are incorrect.
4 Assertion is incorrect but Reason is correct.
PHXI12:THERMODYNAMICS

371469 A monoatomic gas \({\left(\gamma=\dfrac{5}{3}\right)}\) is suddenly compressed to \({1 / 8}\) of its volume adiabatically. If the initial pressure is \({P}\), then the final pressure of the gas is

1 \({\dfrac{24}{5} P}\)
2 \({8 P}\)
3 \({\dfrac{40}{3} P}\)
4 \({32 P}\)
PHXI12:THERMODYNAMICS

371465 During an adiabatic expansion, the increase in volume is associated with which of the following possibilities regarding pressure and temperature ?
\(\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{Pressure}}{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} \,\,{\mkern 1mu} \,\,{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\rm{Temperature}}\)

1 \[\begin{array}{*{20}{c}}
{{\rm{Increase}}}&{\,{\rm{Increase}}}
\end{array}\]
2 \[\begin{array}{*{20}{c}}
{{\rm{Decrease}}}&{{\rm{Decrease}}}
\end{array}\]
3 \[\begin{array}{*{20}{c}}
{{\rm{Increase}}}&{{\rm{Decrease}}}
\end{array}\]
4 \[\begin{array}{*{20}{c}}
{{\rm{Decrease}}}&{\,{\rm{Increase}}}
\end{array}\]
PHXI12:THERMODYNAMICS

371466 In a thermodynamic system, ' \(W\) ' represents the work done by the system and ' \(\Delta U\) ' is the increase in internal energy. Which of the following statements is true?

1 In an isothermal process, \(\Delta U=W\)
2 In an adiabatic process, \(\Delta U=-W\)
3 In an isothermal process, \(\Delta U=-W\)
4 In an adiabatic process, \(\Delta U=W\).
PHXI12:THERMODYNAMICS

371467 During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its temperature. The ratio of \(\dfrac{C_{P}}{C_{V}}\) for the gas is

1 \(\dfrac{4}{3}\)
2 \(2\)
3 \(\dfrac{5}{3}\)
4 \(\dfrac{3}{2}\)
PHXI12:THERMODYNAMICS

371468 Assertion :
Air quickly leaking out of a balloon becomes cooler.
Reason :
The leaking air undergoes adiabatic expansion

1 Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.
3 Both Assertion and Reason are incorrect.
4 Assertion is incorrect but Reason is correct.
PHXI12:THERMODYNAMICS

371469 A monoatomic gas \({\left(\gamma=\dfrac{5}{3}\right)}\) is suddenly compressed to \({1 / 8}\) of its volume adiabatically. If the initial pressure is \({P}\), then the final pressure of the gas is

1 \({\dfrac{24}{5} P}\)
2 \({8 P}\)
3 \({\dfrac{40}{3} P}\)
4 \({32 P}\)
PHXI12:THERMODYNAMICS

371465 During an adiabatic expansion, the increase in volume is associated with which of the following possibilities regarding pressure and temperature ?
\(\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{Pressure}}{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} \,\,{\mkern 1mu} \,\,{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\rm{Temperature}}\)

1 \[\begin{array}{*{20}{c}}
{{\rm{Increase}}}&{\,{\rm{Increase}}}
\end{array}\]
2 \[\begin{array}{*{20}{c}}
{{\rm{Decrease}}}&{{\rm{Decrease}}}
\end{array}\]
3 \[\begin{array}{*{20}{c}}
{{\rm{Increase}}}&{{\rm{Decrease}}}
\end{array}\]
4 \[\begin{array}{*{20}{c}}
{{\rm{Decrease}}}&{\,{\rm{Increase}}}
\end{array}\]
PHXI12:THERMODYNAMICS

371466 In a thermodynamic system, ' \(W\) ' represents the work done by the system and ' \(\Delta U\) ' is the increase in internal energy. Which of the following statements is true?

1 In an isothermal process, \(\Delta U=W\)
2 In an adiabatic process, \(\Delta U=-W\)
3 In an isothermal process, \(\Delta U=-W\)
4 In an adiabatic process, \(\Delta U=W\).
PHXI12:THERMODYNAMICS

371467 During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its temperature. The ratio of \(\dfrac{C_{P}}{C_{V}}\) for the gas is

1 \(\dfrac{4}{3}\)
2 \(2\)
3 \(\dfrac{5}{3}\)
4 \(\dfrac{3}{2}\)
PHXI12:THERMODYNAMICS

371468 Assertion :
Air quickly leaking out of a balloon becomes cooler.
Reason :
The leaking air undergoes adiabatic expansion

1 Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.
3 Both Assertion and Reason are incorrect.
4 Assertion is incorrect but Reason is correct.
PHXI12:THERMODYNAMICS

371469 A monoatomic gas \({\left(\gamma=\dfrac{5}{3}\right)}\) is suddenly compressed to \({1 / 8}\) of its volume adiabatically. If the initial pressure is \({P}\), then the final pressure of the gas is

1 \({\dfrac{24}{5} P}\)
2 \({8 P}\)
3 \({\dfrac{40}{3} P}\)
4 \({32 P}\)
PHXI12:THERMODYNAMICS

371465 During an adiabatic expansion, the increase in volume is associated with which of the following possibilities regarding pressure and temperature ?
\(\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{Pressure}}{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} \,\,{\mkern 1mu} \,\,{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\rm{Temperature}}\)

1 \[\begin{array}{*{20}{c}}
{{\rm{Increase}}}&{\,{\rm{Increase}}}
\end{array}\]
2 \[\begin{array}{*{20}{c}}
{{\rm{Decrease}}}&{{\rm{Decrease}}}
\end{array}\]
3 \[\begin{array}{*{20}{c}}
{{\rm{Increase}}}&{{\rm{Decrease}}}
\end{array}\]
4 \[\begin{array}{*{20}{c}}
{{\rm{Decrease}}}&{\,{\rm{Increase}}}
\end{array}\]
PHXI12:THERMODYNAMICS

371466 In a thermodynamic system, ' \(W\) ' represents the work done by the system and ' \(\Delta U\) ' is the increase in internal energy. Which of the following statements is true?

1 In an isothermal process, \(\Delta U=W\)
2 In an adiabatic process, \(\Delta U=-W\)
3 In an isothermal process, \(\Delta U=-W\)
4 In an adiabatic process, \(\Delta U=W\).
PHXI12:THERMODYNAMICS

371467 During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its temperature. The ratio of \(\dfrac{C_{P}}{C_{V}}\) for the gas is

1 \(\dfrac{4}{3}\)
2 \(2\)
3 \(\dfrac{5}{3}\)
4 \(\dfrac{3}{2}\)
PHXI12:THERMODYNAMICS

371468 Assertion :
Air quickly leaking out of a balloon becomes cooler.
Reason :
The leaking air undergoes adiabatic expansion

1 Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.
3 Both Assertion and Reason are incorrect.
4 Assertion is incorrect but Reason is correct.
PHXI12:THERMODYNAMICS

371469 A monoatomic gas \({\left(\gamma=\dfrac{5}{3}\right)}\) is suddenly compressed to \({1 / 8}\) of its volume adiabatically. If the initial pressure is \({P}\), then the final pressure of the gas is

1 \({\dfrac{24}{5} P}\)
2 \({8 P}\)
3 \({\dfrac{40}{3} P}\)
4 \({32 P}\)
PHXI12:THERMODYNAMICS

371465 During an adiabatic expansion, the increase in volume is associated with which of the following possibilities regarding pressure and temperature ?
\(\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{Pressure}}{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} \,\,{\mkern 1mu} \,\,{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\rm{Temperature}}\)

1 \[\begin{array}{*{20}{c}}
{{\rm{Increase}}}&{\,{\rm{Increase}}}
\end{array}\]
2 \[\begin{array}{*{20}{c}}
{{\rm{Decrease}}}&{{\rm{Decrease}}}
\end{array}\]
3 \[\begin{array}{*{20}{c}}
{{\rm{Increase}}}&{{\rm{Decrease}}}
\end{array}\]
4 \[\begin{array}{*{20}{c}}
{{\rm{Decrease}}}&{\,{\rm{Increase}}}
\end{array}\]
PHXI12:THERMODYNAMICS

371466 In a thermodynamic system, ' \(W\) ' represents the work done by the system and ' \(\Delta U\) ' is the increase in internal energy. Which of the following statements is true?

1 In an isothermal process, \(\Delta U=W\)
2 In an adiabatic process, \(\Delta U=-W\)
3 In an isothermal process, \(\Delta U=-W\)
4 In an adiabatic process, \(\Delta U=W\).
PHXI12:THERMODYNAMICS

371467 During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its temperature. The ratio of \(\dfrac{C_{P}}{C_{V}}\) for the gas is

1 \(\dfrac{4}{3}\)
2 \(2\)
3 \(\dfrac{5}{3}\)
4 \(\dfrac{3}{2}\)
PHXI12:THERMODYNAMICS

371468 Assertion :
Air quickly leaking out of a balloon becomes cooler.
Reason :
The leaking air undergoes adiabatic expansion

1 Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.
3 Both Assertion and Reason are incorrect.
4 Assertion is incorrect but Reason is correct.
PHXI12:THERMODYNAMICS

371469 A monoatomic gas \({\left(\gamma=\dfrac{5}{3}\right)}\) is suddenly compressed to \({1 / 8}\) of its volume adiabatically. If the initial pressure is \({P}\), then the final pressure of the gas is

1 \({\dfrac{24}{5} P}\)
2 \({8 P}\)
3 \({\dfrac{40}{3} P}\)
4 \({32 P}\)