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 ?

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

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Physics
Superconductors are substances which

offer high resistance to the flow of current
conduct electricity at low temperature
offer no resistance to the flow of electricity
conduct electricity at high temperatures

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