31. Sound of frequency below 20 Hz is called
32. On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:
33. Suitable impurities are added to a semiconductor depending on its use. This is done in order to
34. Stars twinkle because
35. It takes much longer to cook food in the hills than in the plains, because
36. Moment of inertia is:
37. Of the following natural phenomena, tell which one known in Sanskrit as 'deer's thirst'?
38. Inside an aeroplane, flying at a high altitude,
39. Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?
40. One thousand microns is equal to
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