According to Einstein, mass is just another form of which of the following?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Energy
NCERT (2026-27):
Mass – Energy – “Einstein showed from his theory of special relativity that it is necessary to treat mass as another form of energy. Before the advent of this theory of special relativity it was presumed that mass and energy were conserved separately in a reaction. However, Einstein showed that mass is another form of energy and one can convert mass-energy into other forms of energy, say kinetic energy and vice-versa.”