Manipal Entrance Test 2017 Physics Paper

The height (h) to which water rises in a capillary tube is given by h=

2T‌cos‌θ

rρg

where θ is angle of contact, r the radius, p the density and g acceleration due to gravity.
When lift moves down with constant acceleration, height is less than h, because effective value of acceleration due to gravity increases hence h decreases.