# NEET Physics Thermodynamics Questions Solved

We consider a thermodynamic system. If ΔU represents the increase in its internal energy and W the work done by the system, which of the following statements is true ?

(1) ΔU = –W in an adiabatic process

(2) ΔU = W in an isothermal process

(3) ΔU = –W in an isothermal process

(4) ΔU = W in an adiabatic process

(1) According to the first law of thermodynamics

$\Delta Q=\Delta U+\Delta W$

In adiabatic process $\Delta Q=0$, hence $\Delta U=-\Delta W$

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