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Q1
One mole of an ideal gas undergoes a cyclic process shown on a \(P\!-\!V\) diagram. The net work done in one complete cycle equals
(Exam: IIT-JEE Year: 1998)
(A) Area enclosed by the loop
(B) Zero for any cycle
(C) Change in internal energy
(D) Heat absorbed in the process
Q2
In an isothermal expansion of an ideal gas, which quantity remains constant?
(Exam: NEET Year: 2016)
(A) Pressure
(B) Volume
(C) Temperature
(D) Internal energy
Q3
The internal energy of an ideal gas depends only on
(Exam: IIT-JEE Year: 2001)
(A) Pressure
(B) Volume
(C) Temperature
(D) Pressure and volume
Q4
In an adiabatic expansion of an ideal gas, the temperature of the gas
(Exam: AIIMS Year: 2012)
(A) Increases
(B) Decreases
(C) Remains constant
(D) First increases then decreases
Q5
For an adiabatic process of an ideal gas, the correct relation is
(Exam: JEE Advanced Year: 2014)
(A) \(PV=\text{constant}\)
(B) \(PV^\gamma=\text{constant}\)
(C) \(PT=\text{constant}\)
(D) \(VT=\text{constant}\)
Q6
The efficiency of a Carnot engine depends on
(Exam: IIT-JEE Year: 1995)
(A) Working substance
(B) Size of the engine
(C) Temperatures of source and sink
(D) Nature of the process
Q7
The value of \(\gamma\) for a monoatomic ideal gas is
(Exam: NEET Year: 2019)
(A) \(4/3\)
(B) \(5/3\)
(C) \(7/5\)
(D) \(3/2\)
Q8
In which process is no work done by the gas?
(Exam: BITSAT Year: 2011)
(A) Isochoric
(B) Isothermal
(C) Isobaric
(D) Adiabatic
Q9
A refrigerator transfers heat from a cold body to a hot body. This is possible because
(Exam: AIIMS Year: 2010)
(A) Heat flows naturally from cold to hot
(B) External work is done
(C) Entropy decreases always
(D) Internal energy increases
Q10
The SI unit of entropy is
(Exam: JEE Main Year: 2017)
(A) J
(B) J K\(^{-1}\)
(C) K J\(^{-1}\)
(D) J m\(^{-3}\)
Q11
For a reversible process, the entropy change of the universe is
(Exam: IIT-JEE Year: 2003)
(A) Positive
(B) Negative
(C) Zero
(D) Maximum
Q12
Which of the following statements is correct?
(Exam: NEET Year: 2015)
(A) Heat is a state function
(B) Work is a state function
(C) Internal energy is a state function
(D) None are state functions
Q13
In an isobaric process, the work done by a gas is
(Exam: JEE Main Year: 2018)
(A) \(P\Delta V\)
(B) \(V\Delta P\)
(C) Zero
(D) \(\Delta U\)
Q14
The coefficient of performance of an ideal refrigerator is always
(Exam: IIT-JEE Year: 1999)
(A) Less than 1
(B) Equal to 1
(C) Greater than 1
(D) Zero
Q15
During free expansion of a gas into vacuum, the temperature of an ideal gas
(Exam: KVPY Year: 2013)
(A) Increases
(B) Decreases
(C) Remains same
(D) Becomes zero
Q16
Which law introduces the concept of absolute temperature?
(Exam: IIT-JEE Year: 1996)
(A) Zeroth law
(B) First law
(C) Second law
(D) Third law
Q17
The work done in an isothermal expansion of an ideal gas from \(V_1\) to \(V_2\) is
(Exam: JEE Advanced Year: 2012)
(A) \(P(V_2-V_1)\)
(B) \(nRT\ln\frac{V_2}{V_1}\)
(C) Zero
(D) \(nC_V(T_2-T_1)\)
Q18
Which thermodynamic process is fastest?
(Exam: AIIMS Year: 2011)
(A) Isothermal
(B) Adiabatic
(C) Isochoric
(D) Isobaric
Q19
The slope of an adiabatic curve on a \(P\!-\!V\) diagram is
(Exam: IIT-JEE Year: 2000)
(A) Less than isothermal slope
(B) Greater than isothermal slope
(C) Same as isothermal slope
(D) Zero
Q20
Entropy is a measure of
(Exam: NEET Year: 2020)
(A) Energy
(B) Disorder
(C) Temperature
(D) Heat
Q21
The first law of thermodynamics is a statement of
(Exam: IIT-JEE Year: 1997)
(A) Conservation of energy
(B) Conservation of momentum
(C) Increase of entropy
(D) Heat flow direction
Q22
For an ideal gas, \(C_P-C_V\) equals
(Exam: JEE Main Year: 2016)
(A) \(R\)
(B) \(2R\)
(C) \(0\)
(D) \(\gamma R\)
Q23
Which cycle has the maximum possible efficiency?
(Exam: IIT-JEE Year: 2005)
(A) Otto cycle
(B) Diesel cycle
(C) Carnot cycle
(D) Brayton cycle
Q24
A gas absorbs heat \(Q\) and does equal amount of work. The process is
(Exam: NEET Year: 2014)
(A) Isochoric
(B) Isothermal
(C) Adiabatic
(D) Isobaric
Q25
Which of the following quantities can be negative?
(Exam: IIT-JEE Year: 2002)
(A) Absolute temperature
(B) Entropy
(C) Work
(D) Internal energy
Q26
The third law of thermodynamics states that at absolute zero, entropy is
(Exam: JEE Main Year: 2019)
(A) Maximum
(B) Infinite
(C) Zero
(D) Negative
Q27
Which process is represented by a vertical line on a \(P\!-\!V\) diagram?
(Exam: BITSAT Year: 2010)
(A) Isothermal
(B) Isobaric
(C) Isochoric
(D) Adiabatic
Q28
The work done in a cyclic process is
(Exam: IIT-JEE Year: 1994)
(A) Zero
(B) Equal to heat absorbed
(C) Equal to change in internal energy
(D) Always positive
Q29
In which process does temperature increase most rapidly with compression?
(Exam: JEE Advanced Year: 2011)
(A) Isothermal
(B) Isobaric
(C) Isochoric
(D) Adiabatic
Q30
The efficiency of a heat engine is always
(Exam: NEET Year: 2018)
(A) Less than 1
(B) Equal to 1
(C) Greater than 1
(D) Zero
Q31
The unit of work in thermodynamics is
(Exam: AIIMS Year: 2009)
(A) Joule
(B) Watt
(C) Pascal
(D) Kelvin
Q32
For an ideal gas undergoing adiabatic expansion, which remains constant?
(Exam: IIT-JEE Year: 2004)
(A) \(PV\)
(B) \(T\)
(C) \(PV^\gamma\)
(D) \(PT\)
Q33
Entropy change in a spontaneous process is
(Exam: NEET Year: 2021)
(A) Zero
(B) Negative
(C) Positive
(D) Random
Q34
The area under a \(P\!-\!V\) curve represents
(Exam: IIT-JEE Year: 1993)
(A) Heat absorbed
(B) Change in entropy
(C) Work done
(D) Internal energy
Q35
Which is not a thermodynamic state variable?
(Exam: JEE Main Year: 2015)
(A) Pressure
(B) Volume
(C) Temperature
(D) Work
Q36
The slope of an isothermal curve on a \(P\!-\!V\) diagram is proportional to
(Exam: IIT-JEE Year: 2006)
(A) \(P\)
(B) \(V\)
(C) \(-P/V\)
(D) \(+P/V\)
Q37
Which process has maximum work output between given volumes?
(Exam: IIT-JEE Year: 2008)
(A) Adiabatic
(B) Isothermal
(C) Isochoric
(D) Isobaric
Q38
In a reversible adiabatic process, entropy change is
(Exam: JEE Advanced Year: 2013)
(A) Positive
(B) Negative
(C) Zero
(D) Maximum
Q39
Which of the following is impossible according to the second law?
(Exam: IIT-JEE Year: 1992)
(A) Complete conversion of work into heat
(B) Complete conversion of heat into work
(C) Heat flow from hot to cold
(D) Increase of entropy
Q40
The internal energy of an ideal gas during isothermal expansion
(Exam: NEET Year: 2013)
(A) Increases
(B) Decreases
(C) Remains constant
(D) Becomes zero
Q41
The specific heat at constant volume of a gas is defined as
(Exam: JEE Main Year: 2014)
(A) Heat required per unit mass per unit rise in temperature at constant pressure
(B) Heat required per unit mass per unit rise in temperature at constant volume
(C) Heat required per mole per unit rise in pressure
(D) Heat required per mole per unit rise in volume
Q42
The change in entropy of an ideal gas in a reversible isothermal process is
(Exam: IIT-JEE Year: 2007)
(A) Zero
(B) \(nR\ln\frac{V_2}{V_1}\)
(C) \(nC_V\ln\frac{T_2}{T_1}\)
(D) Negative
Q43
Which law of thermodynamics forbids perpetual motion machine of the first kind?
(Exam: NEET Year: 2017)
(A) Zeroth law
(B) First law
(C) Second law
(D) Third law
Q44
For a diatomic gas at room temperature, \(\gamma\) is approximately
(Exam: IIT-JEE Year: 1991)
(A) \(1.33\)
(B) \(1.40\)
(C) \(1.67\)
(D) \(1.50\)
Q45
Which process is also called an isentropic process?
(Exam: JEE Advanced Year: 2010)
(A) Isothermal
(B) Adiabatic reversible
(C) Isochoric
(D) Isobaric
Q46
The efficiency of a Carnot engine working between \(T_1\) and \(T_2\) is
(Exam: IIT-JEE Year: 2009)
(A) \(\frac{T_1}{T_2}\)
(B) \(1-\frac{T_2}{T_1}\)
(C) \(\frac{T_2}{T_1}\)
(D) \(1+\frac{T_2}{T_1}\)
Q47
Which quantity remains unchanged in free expansion of an ideal gas?
(Exam: NEET Year: 2022)
(A) Pressure
(B) Volume
(C) Temperature
(D) Entropy
Q48
The work done by a gas in an isochoric process is
(Exam: JEE Main Year: 2020)
(A) Maximum
(B) Minimum
(C) Zero
(D) Equal to heat supplied
Q49
Which of the following increases during irreversible processes?
(Exam: IIT-JEE Year: 2001)
(A) Energy
(B) Entropy of system only
(C) Entropy of universe
(D) Temperature always
Q50
The fundamental limitation on the efficiency of heat engines is given by
(Exam: JEE Advanced Year: 2015)
(A) First law
(B) Second law
(C) Zeroth law
(D) Ideal gas law

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