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Choose the correct statement related to heat Q.

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it is defined as $Q = msΔt$

Q is positive if the heat flows into the system

Q is negative if the heat flows out of the system

all the above

answer is D.

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Detailed Solution

The correct statements regarding heat Q are

(i) it is defined and measured using expression $Q = msΔT$

(ii) if system or a body is loosing heat its refered as $- Qis-ve$

(iii) if system or a body is gaining heat it is refered as $+ Qis + ve$

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