Assertion If angle of contact is `0^(@)`, then liquid will neither rise nor fall in a capillary.
Reason : When angle of contact is `0^(@)`, surface is neither convex nor concave inside the capillary. It is flat.

Options

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

Answer

D

Explanation

`k=(2T cos theta)/(r rho g) implies h prop cos theta`
and h=0 when `theta=90^(@)`
Also angle of contact can be `0^(@)` in any practical case.
So, both A and R are incorrect.