alleryStart learning →A process in which the volume is kept constant is called
- isobaric
- adiabatic
- isothermal
- isochoric
Show answer and solution
Correct answer: D. isochoric
Isochoric processes keep the volume fixed, while isobaric ones keep the pressure fixed.
MHT-CET Thermodynamics — practice questions — page 2
Explore 76 free Thermodynamics questions in MHT-CET Physics. Open each question or exercise to read its content, reference answers and available explanation.
Practise Thermodynamics with Quill →Thermodynamics questions and exercises with answers
Showing questions 31–60 of 76.
A process in which the volume is kept constant is calledRead the answer and worked solution →An ideal gas expands isothermally and absorbs 600 J of heat. The work done by the gas isRead the answer and worked solution →During isothermal compression of an ideal gas, the gasRead the answer and worked solution →For an adiabatic change of an ideal gas, which quantity stays constant?Read the answer and worked solution →In the adiabatic relation PV^γ = constant, γ stands forRead the answer and worked solution →An insulated gas does 150 J of work on a piston. The change in its internal energy isRead the answer and worked solution →One mole of ideal gas with γ = 1.4 cools by 20 K in adiabatic expansion. With R = 8.3 J mol^-1 K^-1, the work done isRead the answer and worked solution →A gas in a rigid sealed tank absorbs 250 J of heat. The work done by the gas isRead the answer and worked solution →In an isobaric process of an ideal gas, the heat absorbed goes intoRead the answer and worked solution →A gas completes a cycle and absorbs a net 80 J of heat. The net work done by it isRead the answer and worked solution →'No process can have the sole result of turning heat from a reservoir fully into work' is theRead the answer and worked solution →The Clausius statement rules out a process whose only result isRead the answer and worked solution →By the second law, the coefficient of performance of a refrigerator can never beRead the answer and worked solution →The second law of thermodynamics says the efficiency of a heat engine can never beRead the answer and worked solution →Most spontaneous processes in nature areRead the answer and worked solution →Which is a main cause of irreversibility in real processes?Read the answer and worked solution →Which of these processes is reversible?Read the answer and worked solution →The French engineer who first studied the maximum efficiency of a heat engine in 1824 wasRead the answer and worked solution →The Carnot cycle consists ofRead the answer and worked solution →A Carnot engine has its source at 127 °C and sink at 27 °C. Its efficiency isRead the answer and worked solution →A Carnot engine with sink at 300 K has 50% efficiency. Its source temperature isRead the answer and worked solution →The efficiency of a Carnot engine depends on theRead the answer and worked solution →When every step of a Carnot cycle is run backwards, the device acts as aRead the answer and worked solution →Carnot's theorem states that between two given temperatures no engine is more efficient thanRead the answer and worked solution →As temperature approaches absolute zero, the entropy of a system approachesRead the answer and worked solution →The constant entropy a system keeps at absolute zero is called itsRead the answer and worked solution →Which kind of solid can keep a residual entropy well above zero at absolute zero?Read the answer and worked solution →A machine claimed to produce work with no energy input violates theRead the answer and worked solution →In a natural process, the total entropy of the interacting systemsRead the answer and worked solution →In a reversible heat transfer, the heat element δQ equalsRead the answer and worked solution →
Worked practice questions
An ideal gas expands isothermally and absorbs 600 J of heat. The work done by the gas is
- 600 J
- 300 J
- 1200 J
- 0 J
Show answer and solution
Correct answer: A. 600 J
Internal energy of an ideal gas is unchanged at constant temperature, so all 600 J of heat becomes work.
During isothermal compression of an ideal gas, the gas
- absorbs heat
- releases heat
- warms up
- does net work
Show answer and solution
Correct answer: B. releases heat
Work is done on the gas while its temperature stays fixed, so the same energy leaves as released heat.
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