A liquid does not wet the solid surface if the angle of contact is:
1. equal to $\mathrm{}$\(45^{\circ}\)
2. equal to \(60^{\circ}\)$\mathrm{}$
3. greater then \(90^{\circ}\)$\mathrm{}$
4. zero 

A capillary tube of radius \(0.20\) mm is dipped vertically in the water. The height of the water column raised in the tube will be:
(Surface tension of water\(=0.075\) N/m and density of water \(=1000\) kg/m³. Take \(g=10\) m/s² and contact angle \(0^\circ.\))
1. \(7.5\text{ cm}\)
2. \(6\text{ cm}\)
3. \(5\text{ cm}\) 
4. \(3\text{ cm}\)

When a long glass capillary tube of radius \(0.015~\text{cm}\) is dipped in a liquid, the liquid rises to a height of \(15~\text{cm}\) within it. If the contact angle between the liquid and glass to close to \(0^\circ\), the surface tension of the liquid, in milliNewton m^–1, is:\(\left[\rho_{\text {(liquid) }}=900 \mathrm{~kgm}^{-3}, \mathrm{~g}=10 \mathrm{~ms}^{-2}\right] \) (Give answer in closest integer).
1. \(200\)
2. \(101\)
3. \(402\)
4. \(325\)

The angle of contact at the interface of the water glass is \(0^{\circ},\) ethyl-alcohol glass is \(0^{\circ},\) mercury-glass is \(140^{\circ}\) and methyl iodide-glass is \(30^{\circ}.\) A glass capillary is put in a trough containing one of these four liquids is observed that the meniscus is convex. The liquid in the trough is:
1. water
2. ethyl alcohol
3. mercury
4. methyl iodide

If the surface tension of water is \(0.06\text{ N/m},\) then the capillary rise in a tube of diameter \(1\text{ mm}\) is (\(\theta=0^{\circ}\))
1. \(1.22\text{ cm}\)

2. \(2.44\text{ cm}\)

3. \(3.12\text{ cm}\)

4. \(3.86\text{ cm}\)