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NEET UG PHYSICS MCQ: THERMAL PROPERTIES OF MATTER

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Assertion: A fluid in vacuum expands such that it changes to gaseous state. Its temperature decreases.
Reason: It uses its internal energy as heat of vaporization.

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Correct option: A

If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion

The assertion is true because fluid expansion in a vacuum leads to a gaseous state and temperature decrease. The reason is also true because the fluid uses internal energy for vaporization.

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127^{\circ} \mathrm{C}

. The temp of black body at which rate becomes

32 \times 10^5 \mathrm{~J} / \mathrm{s}-\mathrm{m}^2

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\sigma

+ \frac{1}{2}

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