Tube of Insufficient Length

Q. Liquid rises to a height of $2\text{cm}$ in a capillary tube. The angle of contact between the solid and the liquid is zero. The tube is depressed more now so that the top of the capillary is only $1\text{cm}$ above the liquid. Then, the apparent angle of contact between the solid and the liquid is:

1. $0^{\circ }$
2. ${30}^{\circ }$
3. ${60}^{\circ }$
4. ${90}^{\circ }$

Q. In a capillary rise experiment, the water level rises to a height of $5\text{cm}$. If the same capillary tube is placed in water such that only $3\text{cm}$ of the tube projects outside the water level, then:

1. water will begin to overflow through the capillary
2. angle of contact decreases
3. angle of contact increases
4. the meniscus completely vanishes

Q.

Water rises upto 10 cm height in a long capillary tube. If this tube is immersed in water so that the height above the water surface is only 8 cm, then

1. Water flows out continuously from the upper end

2. Water rises upto upper end and forms a spherical surface

3. Water only rises upto 6 cm height

4. Water does not rise at all

Q. 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

1. the liquid will come out of the tube like in a small fountain
2. the liquid will ooze out of the tube slowly
3. the liquid will fill the tube but not come out of its upper end
4. the free liquid surface inside the tube will not be hemispherical

Q.

When a capillary is dipped in water, water rises to a height h. If the length of the capillary is made less than h, then

1. The water will come out

2. The water will not come out

3. The water will not rise

4. The water will rise but less than height of capillary