Q. No.A mercury drop does not spread on a glass plate because the angle of contact between glass and mercury is
1. Acute
2. Obtuse
3. Zero
4.
The liquid meniscus in the capillary tube will be convex if the angle of contact is
1. Greater than 90°
2. Less than 90°
3. Equal to 90°
4. Equal to 0°
A liquid wets a solid completely. The meniscus of the liquid in a sufficiently long tube is
1. Flat
2. Concave
3. Convex
4. Cylindrical
A drop of mercury of radius 2 mm is split into 8 identical droplets. Find the increase in surface energy. (Surface tension of mercury is )
1.
2.
3.
4.
For which of the two pairs, the angle of contact is same
1. Water and glass; glass and mercury
2. Pure water and glass; glass and alcohol
3. Silver and water; mercury and glass
4. Silver and chromium; water and chromium
If two soap bubbles of equal radii r coalesce then the radius of curvature of interface between two bubbles will be
1. r
2. 0
3. Infinity
4. 1/2r
A water film is formed between the two straight parallel wires, each of length \(10~\text{cm}\), kept at a separation of \(0.5~\text{cm}.\)Now, the separation between them is increased by \(1~\text{mm}\) without breaking the water film. The work done for this is
(surface tension of water =\(7.2\times 10^{-2}~\text{N/m}\))
1. \(7.22\times 10^{-6}~\text{J}\)
2. \(1.44\times 10^{-5}~\text{J}\)
3. \(2.88\times 10^{-5}~\text{J}\)
4. \(5.76\times 10^{-5}~\text{J}\)
(surface tension of water =\(7.2\times 10^{-2}~\text{N/m}\))
1. \(7.22\times 10^{-6}~\text{J}\)
2. \(1.44\times 10^{-5}~\text{J}\)
3. \(2.88\times 10^{-5}~\text{J}\)
4. \(5.76\times 10^{-5}~\text{J}\)
Nature of meniscus for liquid of angle of contact
1. Plane
2. Parabolic
3. Semi-spherical
4. Cylindrical
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