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10 Question-Answer on work power energy 1.        If two protons are brought near one another, the potential energy of the system will: (a)     Increase (b)    Decrease (c)     Remain the same (d)    Equal to the kinetic energy Ans:   (a) 2.        A water pump driven by petrol raises water at a rate of 0.5 m 3 /min. from a depth of 30 m. If the pump is 70% efficient the power developed by the engine is: (a)     1750 W (b)    2450 W (c)     3500 W (d)    7000 W Ans: ( c)   3.        The energy required to accelerate a car from 10 m/s to 20 m/s is n times the energy required to accelerate the same from rest to 10 m/s, where n is : (a)     1 (b)    4 (c)     2 (d)    3 Ans: ( d)   4.   ...