Physics
A good conductor while carrying current is

Negatively charged
Positively charged
Alternately charged positive and negative
Electrically neutral

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Physics
Stars twinkle because

the distance of the stars from the earth changes with time.
the refractive index of the different layers of the earth's atmosphere ch
None of these
the intensity of light emitted by them changes with time.

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Physics
Rainbow is due to

ionisation of water deposits
diffusion of sunlight through water droplets
refraction and reflection of sunlight by water droplets
absorption of sunlight in minute water droplets

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