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If a glass rod is dipped in mercury and withdrawn out, the mercury does not wet the rod because

Angle of contact is acute

Cohesion force is more

Adhesion force is more

The density of mercury is more

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Explanation

(b)

Cohesive force is the intermolecular attraction between like molecules, whereas adhesive force is the intermolecular force between unlike molecules. In the given case cohesive force between mercury molecules is more than adhesive force between mercury molecules and glass rod, hence mercury does not stick to rod.

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Mercury does not wet glass, wood or iron because

Cohesive force is less than the adhesive force

Cohesive force is greater than the adhesive force

The angle of contact is less than 90^o

Cohesive force is equal to the adhesive force

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Explanation

(b)

Cohesive force is greater than the adhesive force.

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Surface tension of a liquid is found to be influenced by

It increases with the increase of temperature

Nature of the liquid in contact

Presence of soap that increases it

Its variation with the concentration of the liquid

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Explanation

(d)

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When a drop of water is dropped on oil surface, then

It will mix up with oil

It spreads in the form of a film

It will deform

It remains spherical

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Explanation

(d) Because surface tension of water > surface tension of oil

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Small liquid drops assume spherical shape because

Atmospheric pressure exerts a force on a liquid drop

Volume of a spherical drop is minimum

Gravitational force acts upon the drop

Liquid tends to have the minimum surface area due to surface tension

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Explanation

(d) Sphere has the minimum surface area for the given volume of the liquid.

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It is easy to wash clothes in hot water because its

Surface tension is more

Surface tension is less

Consumes less soap

None of these

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Explanation

(b) Surface tension of water decrease with rise in temperature

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The force required to separate two glass plates of area $10^{- 2} m^{2}$ with a film of water 0.05 mm thick between them, is (Surface tension of water is $70 \times 10^{- 3}$ N/m)

28 N

14 N

50 N

38 N

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Explanation

(a) Force required to separate the plates

$F = \frac{2 TA}{t} = \frac{2 \times 70 \times 10^{- 3} \times 10^{- 2}}{0.05 \times 10^{- 3}} = 28 N$

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Oil spreads over the surface of water whereas water does not spread over the surface of the oil, due to

Surface tension of water is very high

Surface tension of water is very low

Viscosity of oil is high

The viscosity of water is high

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Explanation

(a)

The surface tension of the water is more than oil. Therefore, when oil is poured over water, the greater value of surface tension of water pulls the oil in all direction and as such it spreads on the water. On the other hand, when water is poured over oil, it does not spread over it because the surface tension of oil is less than that of water, it is not able to pull water over it.

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Cohesive force is experienced between

Magnetic substances

Molecules of different substances

Molecules of same substances

None of these

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Explanation

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The property utilized in the manufacture of lead shots is

Specific weight of liquid lead

Specific gravity of liquid lead

Compressibility of liquid lead

Surface tension of liquid lead

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Explanation

(d)

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