NEET UG PHYSICS MCQ: THERMODYNAMICS

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Water is used to cool the radiators of engines in cars because

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Correct option: B

Of its high specific heat

Option B (Of its high specific heat) is correct because water's high specific heat capacity allows it to absorb a large amount of heat without a significant temperature increase, making it an effective coolant.

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The work done during expansion of a gas is independent of pressure if the expansion takes place When heat is added to a system, which of the following is not possible? The

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relation for an adiabatic expansion is
A Carnot engine has efficiency

\frac{1}{4}

. Efficiency becomes

\frac{1}{3}

when temperature of sink is decreased by 50 K (keeping source fixed). What is the original temperature of the sink? If sink and source temperature of a refrigerator are

4^{\circ} \mathrm{C}

and

15^{\circ} \mathrm{C}

respectively. Then efficiency of refrigerator is The

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unit of mechanical equivalent of heat is