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First Law of Thermodynamics mcq. We covered all the First Law of Thermodynamics mcq in this post for free so that you can practice well for the exam.
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mcq on First Law of Thermodynamics for Students
CO₂ gas initially at 50 atm and 300 K undergoes an adiabatic free expansion to a volume that is 20 times greater. What is the temperature change?
a) 3.3°C
b) 33°C
c) 0°C
d) 33 K
Option b – 33°C
Entropy increases in a thermodynamic system when it is used to convert:
a) Heat into work in a cyclic process
b) Heat into work through a cyclic transformation
c) work into Heat at constant temperature
The combined expression of the first and second laws of Thermodynamics is:
a) dU = TdS + dQ
b) dQ = TdS + PdV
c) TdS = dU – PdV
d) None of these
Option a – dU = TdS + dQ
Which of the following statements about entropy in reversible processes are true? a. Heat absorbed in any reversible path is independent of the path b. Change in entropy during a reversible process does not depend on the path c. Entropy change is path-independent in a reversible system
a) a and b are correct
b) b and c are correct
c) only b is correct
d) None of these
Option b – b and c are correct
For isothermal, isobaric, and reversible processes, the Gibbs free energy G=H−TSG = H – TSG=H−TS:
a) Varies linearly
b) Changes non-linearly
c) Stays constant but not zero
d) Equals zero
Option c – Stays constant but not zero
During a reversible adiabatic process, which property of the system remains unchanged?
a) Entropy
b) Temperature
c) Specific Heat
d) Enthalpy
Option a – Entropy
In Carnot’s cycle, what is the NET change in entropy of the working substance?
a) It increases
b) It remains unchanged
c) It decreases
d) None of these
Option b – It remains unchanged
Under reversible, isothermal, and isobaric conditions, Gibbs function behaves as:
a) G > 0 and varies with temperature
b) G stays constant
c) G < 0 and varies with entropy
d) G depends on both temperature and entropy
Option b – G stays constant
Entropy decreases in a gaseous system when it expands through:
a) Adiabatic work
b) Seepage without volume change
d) None of the above
Option b – Seepage without volume change
How much mechanical energy is required to melt 1 gram of ice?
a) 336 J
b) 80 J
c) 36 J
d) 42 J
Option a – 336 J
If a blackbody at 1227°C emits energy at a rate E, then at 2727°C, it emits energy at:
a) 16E
b) 4E
c) 2E
d) 8E
Option a – 16E
An ideal gas is heated at constant pressure, doubling its volume. If it started at 27°C, its final temperature is:
a) 300°C
b) 600°C
c) 54°C
d) 327°C
Option b – 600°C
For an ideal gas, the internal energy depends solely on:
a) Temperature
b) Pressure
c) Volume
d) Size of molecules
Option a – Temperature
In a P-V diagram, what does the area under the curve represent?
a) work done on the system
b) A thermodynamic process
c) work in a cyclic process
d) None of these
Option a – work done on the system
At what temperature (in Kelvin) will hydrogen molecules have the same average speed as nitrogen molecules at 35°C?
a) 495
b) 22
c) 275
d) 42
Option b – 22
For an ideal gas undergoing a process where dW=0dW = 0dW=0 and dQ<0dQ < 0dQ<0, what happens?
a) Temperature decreases
b) Volume increases
c) Pressure remains constant
d) Temperature increases
Option a – Temperature decreases
In a pressure-volume diagram, the area enclosed within a closed loop indicates:
a) Work done in a cyclic process
b) A thermodynamic change
c) The state of the system
d) None of these
Option a – Work done in a cyclic process
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