Question

When a capillary tube is dipped in a liquid, the liquid rises to a height $h$ in the tube. The free liquid surface inside the tube is hemispherical in shape. The tube is now pushed down so that the height of the tube outside the liquid is less than $h$. Then the

• A. liquid will come out of the tube like in a small fountain
• B. liquid will ooze out of the tube slowly
• C. free liquid surface inside the tube is hemispherical
• D. the liquid will fill the tube but not come out of its upper end

Answer 1

Answer: (D)

the liquid will fill the tube but not come out of its upper end

Answer 2

The angle of contact at the free liquid surface inside the capillary tube will change in such a way that the vertical component of the surface tension forces just balance the weight of liquid column