EASY
11th ICSE
IMPORTANT
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An iron needle floats on the surface of water. This phenomenon is attributed to :

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Important Questions on Surface Tension

EASY
11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 3
A square frame of wire of side $l$ is dipped in a liquid of surface tension T. On taking out just above the liquid surface, a membrane is formed on the frame. The force acting on the frame will be :
MEDIUM
11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 4
A ring is cut from a platinum tube of 8.5 cm internal 8.7 cm external diameter. It is supported horizontally from a pan of a balance so that it comes in contact with water in a glass vessel. If an extra 3.97 gram weight is required to pull it away from water, the surface tension of water is :
EASY
11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 5
The surface tension of liquid :
MEDIUM
11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 6
At critical temperature, the surface tension of a liquid :
EASY
11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 7
Consider a liquid contained in a vessel. The liquid-solid adhesive force is very weak compared to the cohesive force in the liquid. The shape of the liquid-surface near the solid shall be:
EASY
11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 8
A liquid does not wet the surface of a solid, if the angle of contact is _____.
MEDIUM
11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 9
When there are no external forces, the shape of a small liquid drop is determined by:
EASY
11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 19 - Surface Tension>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 10

On heating water, bubbles being formed at the bottom of the vessel detach and rise. Take the bubbles to be spheres of radius R and making a circular contact of radius r with the bottom of the vessel. If r<<R, and the surface tension of water is T, value of r just before bubbles detach is :

(density of water is pw)