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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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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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1.select the correct alternative: 1.1 In boiling: A. All molecules of liquid begin to escape out. B. Only the molecules at the surface esca...
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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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