Surface Tension
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- 0.0125 Nm−1
- 0.1 Nm−1
- 0.05 Nm−1
- 0.025 Nm−1
The breaking stress of a wire depends upon the:
Length of the wire
Radius of the wire
Material of the wire
Shape of the cross-section
Define angle of contact.
(radius of the earth is 6400 km)
- 32 km
- 64 km
- 128 km
- 1600 km
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- surface tension in drop
- gravitational force on drop
- air resistance on drop
- thrust on drop
- 2×105 Pa
- 2.3×105 Pa
- 3×105 Pa
- 3.3×105 Pa
- is infinity
- is zero
- is same as that at any other temperature
- cannot be determined
- 0.1
- 0.2
- 0.001
- 0.002
The contact angle between a solid and a liquid is a property of?
the material of the solid
the material of the liquid
the shape of the solid
the mass of the solid
- None of these
- 6.75 m/s
- 6.25 m/s
- 7.25 m/s
- 2TL
- 4TL
- 8TL
- 16TL
A capillary tube made of glass of radius is dipped vertically in a beaker filled with methylene iodide (surface tension , density ) which rises to height in the tube. It is observed that the two tangents drawn from liquid-glass interfaces (from opp. sides of the capillary) make an angle of with one another. Then is close to ().
[Given, T is the surface tension and ρ is the density of liquid]
- √6Tρ[1a−1b]
- √4Tρ[1a−1b]
- √8Tρ[1a−1b]
- √5Tρ[1a−1b]
- water will come out as a fountain from the capillary tube.
- water will stay at a height of 12 cm in the capillary tube but radius of curvature at the top will increase.
- water will stay at a height of 12 cm in capillary tube but radius of curvature at the top will decrease.
- water will flow down the side of the capillary tube.
If the error in measurement of the surface area of a sphere is 4%, then the error in measurement of its volume will be
- 4%
- 6%
- 8%
- 16%