Question

Water rises in a capillary tube a height h. Choose false statement regarding capillary rise from the following.
A. On the surface of jupiter, height will be less than h
B. In a lift moving up with contact acceleration height is less than h
C. On the surface of moon the height is more than h
D. In a lift moving down with constant acceleration height is less than h

Answer 1

Correct Answer - D
The height (h) to which water rises in a capillary tube is given by `h = (2T cos theta)/(r rho g)`
When lift moves down with constant acceleration, height is more than h, because effective value of acceleration due to gravity decreases, hence h increases.