Q69 of 84 Page 290

Lightning can even burn up a tree. Lightning contains a tremendous amount of:

Lightening is the name given to the flash of light which occurs in the sky during the rainy season. The process of electric discharge between clouds and the earth or between different clouds causes lightning.

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67

The place inside the earth's crust where the earthquake is generated is called:

 68

An inflated rubber balloon is rubbed with a woollen cloth whereas a ballpoint pen refill is rubbed with a polythene bag. Which of these will get positively charged?

A) Inflated rubber balloon


B) Woollen cloth


C) Ballpoint pen refill


D) Polythene bag

 70

The tremendous electric charges in the atmosphere which produce sheet lightning in the clouds are produced by the process of:

 71

Explain why, a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted by a charged balloon. (NCERT Book Question)