Q36 of 146 Page 164

When an object falls freely towards the earth, then its total energy:

A. Increases B. Decreases


C. Remains constant


D. First increases and then decreases

Since, According to Law of Conservation of energy, Energy can neither be created nor be destroyed but can be only transformed from one form to another.

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35

Define power. Give the SI unit of power.

 35

A boy weighing 40 kg carriers a box weighing 20 kg to the top of a building 15 m high in 25 seconds. Calculate the power. (g = 10 m/s2)

 37

Which one of the following is not the unit of energy?

A. Joule B. Newton-metre


C. Kilowatt D. Kilowatt-hour

 38

Which of the following energy change involves frictional force?

A. Chemical energy to heat energy


B. Kinetic energy to heat energy


C. Potential energy to sound energy


D. Chemical energy to kinetic energy