Assertion : In an isolated system the entropy increases.
Reason : The processes in an isolated system are adiabatic.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If the assertion and reason both are false.

Answer

B

Explanation

External force on the system `F_("ext")= M (d)/(dt) (vec(v)_(cm))`
If system is isolated i.e `F_("ext")= 0` then `vec(v)_(cm)`= constant If initially the velocity of centre of mass is zero then it will remain zero.