31. Which one of the following instruments is used to study dispersion of light ?
32. Which one of the following is responsible for the working of Newton's colour disc experiment ?
33. An object which absorbs all colours and reflects none appears:
34. Microphone is a device which transforms the
35. Conversion of heat into electrical energy is achieved by using :
36. How much calorie of energy is released by a boiled egg ?
37. A stone is dropped from the roof of a house towards the ground. The kinetic energy of the stone will be maximum:
38. A 4 kg object is moving horizontally with a speed of 5 m/s. To increase its speed to 10 m/s, the amount of net work required to be done on this object is:
39. Gasoline is useful in cars because it has
40. Electric Motor converts ________ energy to mechanical energy
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