Question

A physical quantity that is conserved in a process

• A. must have the same value for all observers
• B. can never take negative values
• C. must be dimensionless
• D. need not necessarily be a scalar

Answer 1

Answer: (A)

must have the same value for all observers

Solution : When a physical quantity remains the same before and after the physical event, we say that in that event that quantity is conserved. In a conservative field, when body moves from one place to another place, it' s mechanical energy does not change. And momentum depends upon the observer thus we can say that a physical quantity that is conserved in a process must have same value for all observers.

The Correct Option is A