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For the myopic eye, the defect is cured by
Assertion (A) The concept of surface tension is held only for liquid. Reason (R) Surface tension does not hold for gases.
In a vacuum, a five-rupee coin a, feather of sparrow bird and a mango are dropped simultaneously from the same height. The time taken by them to reach the bottom is t 1 , t 2 and t 3 , respectively. In this situation, we will observe that
An electric fan of 300 W is used daily for 8 hours. The amount of energy used by that fan in a day will be . . . . . . . . units.
It is easier to roll a stone up a sloping road than to lift it vertical upwards because