Physics
Super conductors are substances that

Conduct electricity at high temperature
Offer high resistance to the flow of electric current
Offer minimum resistance to flow of electric current
Conduct electricity at low temperature

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Physics
Stars twinkle because

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

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