Exams › NEET › Physics

The angle of contact between pure water and pure glass, is:

1. 0°
2. 45°
3. 90°
4. 135°

Correct answer: 0°

Solution

The angle of contact between pure water and pure glass is 0° because water completely wets the glass surface due to strong adhesive forces between water molecules and glass.

Related NEET Physics questions

• If the air density were uniform, then the height of the atmosphere above the sea level to produce a normal atmospheric pressure of \( 1.0 \times 10^{5} \) Pa is (density of air is \( 1.3 \mathrm{kg} / \mathrm{m}^{3}, \mathrm{g}=10 \mathrm{m} / \mathrm{s}^{2} \) ):
• 1atm \( = \)
• The atmospheric pressure at is 100,000 pascal.
• According to Newton, the viscous force acting between liquid layers of area A and velocity gradient ΔV/ΔZ is given by \( F = -ηA \frac{ΔV}{ΔZ} \) where η is constant called coefficient of viscosity. The dimensional formula of η is
• As we know that, surface tension(s) is:
• The cylindrical tube of a spray pump has radius, R, one end of which has n fine holes, each of radius r. If the speed of the liquid in the tube is V, the speed of the ejection of the liquid through the holes is:

⚔️ Practice NEET Physics free + battle 1v1 →