Physics
The mass defect is the result of what action occurring?

Mass being converted to energy when protons and neutrons bind together in a nucleus
Energy being converted into moles of atoms when neutrons break apart protons
Mass being converted to energy when protons and neutrons break apart in a nucleus
Protons and electrons being attracted to each other

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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 ?

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

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