NEET UG PHYSICS MCQ: THERMAL PROPERTIES OF MATTER

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Analyzing +4 | -1

Assertion (A): V-t graph for a gas at constant pressure is a straight line passing through origin

\{

t-temp in Celsius]
Reason (R): Volume of a gas is inversely proportional to its absolute temperature at constant pressure.

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Correct option: D

If both (A) and (R) are false

Option D (If both (A) and (R) are false) is correct because the V-t graph at constant pressure doesn't pass through the origin (Celsius scale), and volume is directly proportional to absolute temperature (Charles's Law), not inversely.

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A black body radiates heat energy at the rate of

2 \times 10^5 \mathrm{~J} / \mathrm{sm}^2

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127^{\circ} \mathrm{C}

. The temp of black body at which rate becomes

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\sigma

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