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Thermodynamics mcqs with Answers. We covered all the Thermodynamics mcqs with Answers in this post for free so that you can practice well for the exam.
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mcq on Thermodynamics for NEET Students
A gas undergoes adiabatic compression due to an 800 N force acting over a distance of 6.0 cm. What is the resulting change in its internal energy?
(A) +50 J
(B) +48 J
(C) -50 J
(D) -48 J
Option b – +48 J
Why is it impossible for a Carnot engine to achieve 100% efficiency?
(A) reach absolute zero temperature
(B) find ideal sources
(C) eliminate friction
(D) prevent radiation
Option a – reach absolute zero temperature
How much work is done when 4 moles of an ideal gas are compressed to half of their original volume at a constant temperature of 300 K?
(A) -6917 J
(B) 6000 J
(C) 6917 J
(D) -6000 J
Option a – -6917 J
A refrigerator removes 2000 calories of Heat from ice trays. If its coefficient of performance is 5, how much work is done by the motor (in Heat units)?
(A) 300
(B) 400
(C) 200
(D) 500
Option b – 400
Water vaporizes with a latent Heat of 2240 J/g. If the expansion work done for 1 g of water is 178 J, what is the gain in internal energy?
(A) 2408 J
(B) 2240 J
(C) 2062 J
(D) 1904 J
Option c – 2062 J
One mole of O₂ gas with an initial volume of 22.4 liters at 0 °C and 1 atm pressure is compressed isothermally to 5.6 liters. What is the work done during this process?
(A) 3145.5 J
(B) 1728 J
(C) -1728 J
(D) -3145.5 J
Option d – -3145.5 J
A Carnot engine operating between 500 K and 750 K generates 300 J of work per cycle. How much Heat does it absorb from the source in each cycle?
(A) 400 J
(B) 800 J
(C) 900 J
(D) 1600 J
Option c – 900 J
A gas is adiabatically compressed such that its temperature becomes three times higher. What is the ratio of final volume to initial volume?
(A) 1/3
(B) less than 1/3
(C) more than 1/3
(D) between 3 and 4
Option b – less than 1/3
A refrigerator keeps its contents at 7 °C while the surrounding temperature is 27 °C. What is its coefficient of performance?
(A) 7.5
(B) 8.3
(C) 14
(D) 10.5
Option c – 14
During the adiabatic expansion of 3 moles of gas, the internal energy decreases by 3 joules. What is the corresponding work done by the gas?
(A) 1 J
(B) -1 J
(C) 3 J
(D) -3 J
Option d – -3 J
A diatomic gas undergoes a temperature change through two different methods: (i) at constant pressure and (ii) at constant volume. What is the ratio of Heat supplied in these two cases?
(A) 1 : 1
(B) 3 : 5
(C) 7 : 5
(D) 5 : 7
Option d – 5 : 7
The internal energy of a system varies directly with which of the following?
(A) temperature
(B) pressure
(C) volume
(D) external work done
Option a – temperature
For an ideal Heat engine to operate at 30% efficiency while rejecting Heat at 77 °C, what must be the temperature of the Heat source?
(A) 127 °C
(B) 227 °C
(C) 327 °C
(D) 673 °C
Option b – 227 °C
What does the first law of Thermodynamics imply?
(A) a system can do work
(B) the system has a temperature
(C) the system has pressure
When compressing an ideal gas to half of its original volume, which process results in the maximum work done on the gas?
(A) Isothermal
(B) Adiabatic
(C) Isobaric
(D) None of the above
Option b – Adiabatic
A reversible heat engine transforms one-sixth of the input heat into useful work. If the sink’s temperature is decreased by 60 °C, its efficiency becomes twice the original. What are the temperatures of the source and sink?
(A) 80 °C, 37 °C
(B) 95 °C, 28 °C
(C) 90 °C, 37 °C
(D) 87 °C, 27 °C
Option d – 87 °C, 27 °C
A Carnot engine operating between 300 K and 400 K performs 800 J of work. How much heat is absorbed from the high-temperature source?
(A) 2400 J
(B) 3200 J
(C) 1200 J
(D) 3600 J
Option b – 3200 J
A thermodynamic system undergoes two transitions:
i. From (2P, V) to (3P, V)
ii. From (P, 2V) to (P, 3V)
What is the work done in each of these processes?
(A) zero, zero
(B) zero, PV
(C) PV, zero
(D) PV, PV
Option b – zero, PV
An ideal Carnot engine absorbs heat from a reservoir at 317 °C and releases it to a sink at 117 °C. If it takes in 600 kcal from the source, how much heat is rejected to the sink?
(A) 397 kcal
(B) 331 kcal
(C) 117 kcal
(D) 317 kcal
Option a – 397 kcal
During a thermodynamic process, a gas releases 50 J of heat and 10 J of work is done on it. If the gas initially had 50 J of internal energy, what will be its final internal energy?
(A) -18 J
(B) 2 J
(C) 10 J
(D) 58 J
Option c – 10 J
An ideal engine operates with 75% efficiency, absorbing heat at 0 °C. What is the temperature of the sink?
(A) 68.25 K
(B) 137 °C
(C) 273 K
(D) 0 K
Option a – 68.25 K
A refrigerator operates between two bodies with temperatures 127 °C and 227 °C. What is the coefficient of performance?
(A) 4
(B) 1/3
(C) 0.42
(D) 27
Option a – 4
For a monoatomic gas undergoing heating at constant pressure, what fraction of the total heat goes into increasing internal energy?
(A) 2/5
(B) 3/5
(C) 4/5
(D) 1/5
Option b – 3/5
What does the zeroth law of Thermodynamics primarily deal with?
(A) heat
(B) work done
(C) internal energy
(D) none of the above
Option d – none of the above
In the context of the first law of Thermodynamics, which of the following is true?
(A) Q is a perfect differential
(B) W is a perfect differential
(C) W and Q are both perfect differentials
(D) U is a perfect differential but Q and W are not
Option d – U is a perfect differential but Q and W are not
What is implied by the second law of Thermodynamics?
(A) all heat can be transformed into mechanical work
(B) no heat engine can achieve complete efficiency
(C) a refrigerator can cool down to absolute zero
(D) every engine has 100% efficiency
Option b – no heat engine can achieve complete efficiency
A scientist claims that a heat engine operating between 127 °C and 27 °C has an efficiency of 27%. Which statement correctly assesses this claim?
(A) The efficiency is not achievable
(B) The efficiency is unlikely but feasible
(C) The efficiency is reasonable
(D) The information is insufficient
Option a – The efficiency is not achievable
A refrigerator with 40% efficiency takes heat from a cold region and consumes 200 cal of work. What is the total heat discharged to the surrounding?
(A) 1176 J
(B) 252 J
(C) 500 cal
(D) 1058 cal
Option a – 1176 J
Which statement expresses the principle that heat cannot spontaneously flow from a colder to a hotter object?
(A) the second law of Thermodynamics
(B) equipartition theorem
(C) zeroth law of Thermodynamics
(D) the first law of Thermodynamics
Option a – the second law of thermodynamics
Why is the work done during expansion of gas in a vacuum zero?
(A) there is no temperature change in the system
(B) internal energy remains unchanged
(C) there is no external pressure acting against the gas
(D) all of the above
Option c – there is no external pressure acting against the gas
We covered all the thermodynamics mcqs with answers above in this post for free so that you can practice well for the exam.
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