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 ?

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.
B will reach the ground first.

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Physics
In the gamma decay of a nucleus

The mass number of the nucleus does not change whereas its atomic number changes
Both the mass number and the atomic number of the nucleus change
The mass number of the nucleus changes whereas its atomic number does not change
Neither the mass number nor the atomic number of the nucleus changes

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