NTA Abhyas JEE Main2020ChemistryThermodynamics (C)Practice
Based on the first law of thermodynamics, which one of the following is correct?
Options
- AFor an isochoric process, ΔE   =   − q
- BFor an adiabatic process, ΔE   =   − w
- CFor an isothermal process, q = W
- DFor a cyclic process, q = − W
Correct answer
D. For a cyclic process, q = − W
Step-by-step solution
(a) For isochoric process, ΔV = 0 W = pΔV = 0 ∴ ΔE = q (b) For adiabatic process, q = 0 ΔE = W (c) For isothermal process, ΔT = 0 and ΔE = 0 q = − W (d) For cyclic process, state functions like ΔE = 0 q   =   − W