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For an isochoric thermodynamics process:

For an isochoric thermodynamics process: Correct Answer ΔQ = ΔU

EXPLANATION:

The isochoric process means volume is constant while all other variables change.

From First law of Thermodynamics

δQ= ΔU + δW ⇒ δQ= Δ U + PΔV 

As volume is kept constant therefore no work is done on or by the gas.

Hence, heat absorbed by the gas is completely used to change its internal energy and its temperature.

This means whatever heat is supplied to the system is used up completely to change the internal energy and temperature of the system.

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