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Which of the following changes cannot be reversed?

(a)     Blowing of a balloon

(b)     Folding a paper to make a toy aeroplane

(c)     Rolling a ball of dough to make roti

(d)     Baking cake in an oven

(e)     Drying a wet cloth

(f)     Making biogas from cow dung

(g)     Burning of a candle

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The following changes cannot be reversed:

(d)     Baking cake in an oven

(f)     Making biogas from cow dung

(g)     Burning of a candle

Posted by

Sumit Saini

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