defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Physics Thermodynamics First law of thermodynamics
The first law of thermodynamics in an isothermal process is represented by- (ΔQ = heat exchanged, Δ W = work done, and ΔU = Internal energy change).
1
ΔQ = ΔU
2
ΔW = ΔU
3
ΔQ = ΔU - ΔW
4
ΔQ = ΔW