Question
Define buoyant force. Name two factors on which buoyant force depends.
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Which of the above two graphs (a) and (b) (Fig.) representing the human voice is likely to be the male voice? Give reason for your answer.

List one denitrifying bacteria.
What is a stethoscope? Name the principle on which a stethoscope works.
A boy weighing 50kg climbs up a vertical height of 100m. Calculate the amount of work done by him. How much potential energy does he gain? (8 = 9.8m/s2).