Physics
Stars twinkle because

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

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Physics
The nature of fuse wire is

Low resistance and high melting point.
Low resistance and low melting point.
High resistance and low melting point.
High resistance and high melting point.

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