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Class 9 heat revision questions
Second term weekly test revision questions Q1.a) what do you mean by degradation of energy? b) why a person should use bio- char stoves for...
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☆ physical quantity- • A quantity that can be measured is called a physical quantity. Or a measurable quantity is called a physical quan...
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*Physical quantities- - A quantity thú㎲at can be measured is called a physical quantity. -example mass, length, time, temperature, area, v...
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1. Define the term density of substance. Ans. Mass per unit of a substance is called as its density. 2. Name the SI unit of density. How i...
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