Physics
If electric resistance is to be decreased, then the number of resistances should be connected in ________

Parallel
None of these
Mixed arrangement
Series

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Physics
A hydrogen balloon floats up because of

Air pressure decreases with decrease in weight
Weight of the balloon is less than the weight of air displaced by it.
The pressure inside the balloon is more than the pressure outside it
Air pressure decreases with decrease in height

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Physics
'Mirage' is an example of

Refraction of light only
Refraction and total internal reflection of light
Total internal reflection of light only
Dispersion of light only

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