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qUESTIONS

The soap bubble in air has surface tension 0.027 Nm-¹. The excess pressure inside a bubble of diameter 30 mm in SI unit is:

The work done in splitting a waterdrop of radius ‘R’ into 64 droplets is ( T = surface tension of water)

A spherical ball of radius ‘R’ is falling through liquid of viscosity ‘Π’ with velocity ‘v’. The retarding force acting on the spherical ball is:

A square wire frame of each side ‘L’ is dipped in soap solution. On taking out, a membrane is formed. If the surface tension of solution is T, force acting on the frame will be:

A spherical solid ball of volume ‘V’ is made up of a material of density ‘p1’ It is falling through a liquid of density ‘ p2’ (p2 < p1) Assume that the liquid applies a viscous force on the ball that is proportional to square of the terminal speed ‘v1’. F = – Kv1² (K > 0) then the terminal speed of ball is: ( g = acceleration due to gravity)

Water rises up to a height ‘h1’ in a capillary tube immersed vertically in water. When this whole arrangement is taken to a depth ‘d’ in a mine, the water level rises upto a height ‘h2’ If ‘R’ is the radius of the earth, then the ratio ‘h1/ h2’ is:

A lead sphere of mass ‘m’ falls in a viscous liquid with terminal velocity ‘v’ Another lead sphere of mass ‘8 m’ will fall through the same liquid with terminal velocity:

In a capillary tube of area of cross-section ‘a’ water rises to height ‘h’. In a capillary tube of area of cross-section ‘4a’ water will rise upto height:

The liquid meniscus in a capillary tube will be convex if the angle of contact is:

A solid ball of volume “V” is dropped in a viscous liquid. It experiences a viscous force F. If a solid ball of volume 2 V of same material is dropped in the same liquid, then the viscous force acting on it will be:

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