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Model Paper 6 — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsModel Paper 61 Mark
MCQ
Assertion (A): Mass and energy are not conserved separately, but are conserved as a single entity called mass energy. 
Reason (R): Mass and energy conservation can be obtained by Einstein equation for energy.
  • A
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false.
  • D
    A is false but R is true.
✓

Answer

(a) Both A and R are true and R is the correct explanation of A .
Explanation: $\Rightarrow$ From Einstein equation $E = mc ^2$
it can be observed that if mass is conserved then only energy is conserved and vice versa. Thus, both cannot be treated separately.

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