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The energy required to blow a bubble of radius 8 cm and 5 cm in the same liquid is in the ratio of :

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Important Questions on Viscosity and Surface Tension

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Alpha Question Bank for Engineering: Physics>Chapter 14 - Viscosity and Surface Tension>Exercise - 1>Q 54
Surface tension of liquid is 5×10-2 N m-1. If its surface area is increased by 2 cm2, then the increase in surface energy will be :
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Alpha Question Bank for Engineering: Physics>Chapter 14 - Viscosity and Surface Tension>Exercise - 1>Q 55
In a capillary tube, water rises to a height of 2 cm. The height of water that will rise in another capillary tube of radius one-fourth that of first is :
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Alpha Question Bank for Engineering: Physics>Chapter 14 - Viscosity and Surface Tension>Exercise - 1>Q 56

The figure shows a soap film in which a closed elastic thread is lying. The film inside the thread is pricked. Now the sliding wire is moved out so that the surface area increases. The radius of the circle formed by elastic thread will

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Alpha Question Bank for Engineering: Physics>Chapter 14 - Viscosity and Surface Tension>Exercise - 1>Q 57
Assuming the xylem tissues through which water rises from root to the branches in a tree to be of uniform cross-section find the maximum radius of xylum tube in a 10 m high coconut tree so that water can rise to the top. (surface tension of water =0.1 N/m, Angle of contact of water with xylem tube =60° )
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Alpha Question Bank for Engineering: Physics>Chapter 14 - Viscosity and Surface Tension>Exercise - 1>Q 58
A vertical capillary tube with inner radius 0.5 mm, is submerged into water so that the length of its part above the water surface is h=25 mm. Radius of curvature of meniscuses formed will be (surface tension of water =0.075 N m-1. Density of water =103 kg m-3, angle of contact =0°)
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Alpha Question Bank for Engineering: Physics>Chapter 14 - Viscosity and Surface Tension>Exercise - 1>Q 59
A long capillary tube of radius r=0.288 mm open at both ends is filled with water and placed vertically. What will be the height of the column of water left in the capillary (in cm). The thickness of the capillary walls is negligible. (surface tension of water is 72 dyne cm-1, g=1000 cm sec-2 and density of water is 1 g cm-3)
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Alpha Question Bank for Engineering: Physics>Chapter 14 - Viscosity and Surface Tension>Exercise - 1>Q 60
A vertical glass tube of small radius open at both ends contains some water. Which of the following shapes is not possible for the water in the tube (angle of contact between water and glass is acute) :
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Alpha Question Bank for Engineering: Physics>Chapter 14 - Viscosity and Surface Tension>Exercise - 1>Q 61
A thin wire is bent in the form of a ring of diameter 3.0 cm. The ring is placed horizontally on the surface of soap solution and then raised up slowly. Upward force necessary to break the film formed between the ring and the solution is -