Physics
If a band is played on the moon the sound will

Reverberate
Not be heard at any distance at all from it
Be heard upto 10km from it
Be heard by us faintly

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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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