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8th CBSE
IMPORTANT
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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
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Important Questions on Some Natural Phenomena
EASY
8th CBSE
IMPORTANT
Lightning can even burn up a tree. Lightning contains a tremendous amount of:
EASY
8th CBSE
IMPORTANT
The tremendous electric charges in the atmosphere which produce sheet lightning in the clouds are produced by the process of:
MEDIUM
8th CBSE
IMPORTANT
Explain why a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted by a charged balloon.
MEDIUM
8th CBSE
IMPORTANT
Explain why a glass rod can be charged by rubbing when held by hand but an iron rod cannot be charged by rubbing if held by hand.
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8th CBSE
IMPORTANT
A glass rod is rubbed with a silk cloth and an inflated rubber balloon is rubbed with a woollen cloth. Now, out of glass rod, silk cloth, rubber balloon and woollen cloth which two objects acquire negative charge?
MEDIUM
8th CBSE
IMPORTANT
A glass rod is rubbed with a silk cloth and an inflated rubber balloon is rubbed with a woollen cloth. Now, out of glass rod, silk cloth, rubber balloon and woollen cloth which two objects acquire positive charge?
MEDIUM
8th CBSE
IMPORTANT
What will you observe when the metal top of an electroscope is touched with a positively charged object?
MEDIUM
8th CBSE
IMPORTANT
What will you observe when the metal top of an electroscope is touched with a negatively charged object?
