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Class 11 Physics Mechanics Mechanical Properties of Fluids

Surface tension of a liquid is due to:

(a)

gravitational force between molecules

(b)

electrical force between molecules

(c)

adhesive force between molecules

(d)

cohesive force between molecules

Correct answer: (d)

Solution: Its the cohesive force due to which surface molecules are attracted towards other similar molecules inside the surface, making the surface to behave like a stretched membrane.

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collapse into one single drop. What amount of energy is released/ absorbed? The surface tension of mercury

T = 435.5 \times 1 0^{- 3} N m^{- 1}

play button image

An air bubbles rises from the bottom of a lake of large depth. The rising speed of air bubble will

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27

drops of a conducting fluid. each has a radius r and they are charged to a potential

V_{0}

. These are combined to form a bigger drop. Its potential will be:

play button image

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H

above the base. A small hole is made on one vertical side at a depth

D

below the level of water in the tank. The distance

x

from the bottom of the tank, at which the water jet from the tank will hit the ground is,

play button image

You dip a capillary tube into a beaker of different fluids, and from observation of the shape of the fluid surface deduce that in which figure, cohesive forces dominate over adhesive forces :

play button image

The radii of two soap bubbles are in the ratio 2:1. The excess pressures will be in the ratio :-

play button image

The fundemantal quantity which has the same power in the dimensional formula of surface tension and coefficient of viscosity is:

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What will be the work done in increasing the radius of the soap bubble from $\frac{r}{2} to 2 r$ , if the surface tension of soap solution is T?

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Copyright FILO EDTECH PVT. LTD. 2021