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Heat and Thermodynamics mcqs. We covered all the Heat and Thermodynamics mcqs in this post for free so that you can practice well for the exam.
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mcq on Heat and Thermodynamics for Students
Which of the following expresses the equation for Gibbs free energy?
a) dQ = dV + dW
b) dH = TdS + VdP
c) dU = TdS – PdV
d) dH = TdS + VdP
Option d – dH = TdS + VdP
A blackbody is placed in a vacuum at 27°C. What is the ratio of the radiation rate when its temperature rises to 527°C compared to when it is at 127°C?
a) 21 : 23
b) 23 : 1
c) 23 : 14
d) 4 : 221
Option b – 23 : 1
Which thermodynamic quantity indicates the portion of Heat that can be converted into useful work?
a) Helmholtz free energy
b) Gibbs free energy
c) H + G
d) F + G
Option b – Gibbs free energy
Which option reflects the part of internal energy that is available to perform work?
a) Enthalpy
b) Gibbs free energy
c) Total energy
d) Helmholtz free energy
Option d – Helmholtz free energy
At what temperature does Gibbs free energy become zero?
a) T = H/S
b) T = S/H
c) T = SH
d) T = S + H
Option a – T = H/S
What happens to the boiling point of a liquid when the external pressure increases?
a) It rises
b) It remains unchanged
c) It falls
d) None of the above
Option a – It rises
Identify the correct formula that represents enthalpy:
a) H = PV
b) H = U
c) H = U + PV
d) H = QUT
Option c – H = U + PV
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