Physics
A man standing at the top of a tower has two spheres A and B. He drops sphere A downwards and throws sphere B horizontally at the same time. Which of the following is correct ?

B will reach the ground first.
A will reach the ground first.
The question is incomplete because the masses of the spheres are not given.
Both the spheres will reach the ground simultaneously.

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Physics
Stars twinkle because

the intensity of light emitted by them changes with time.
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

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