Power Plant Engineering
The mass number of a substance represents the sum of total number of

Protons and neutrons in a nucleus
Protons and electrons in an atom
Protons and neutrons in an atom
Neutrons and electrons in an atom

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Power Plant Engineering
A nuclear unit becoming critical means

It is capable of generating much more than rated capacity
It is generating power to rated capacity
There is danger of nuclear spread
Chain reaction that causes automatic splitting of the fuel nuclei has been established

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Power Plant Engineering
Isotopes of same elements have

Different masses and different atomic numbers
Same chemical properties but different atomic numbers
Different chemical properties and same atomic numbers
Same atomic number and different masses

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