Small liquid drops assume spherical shape because

(a) Atmospheric pressure exerts a force on a liquid drop

(b) Volume of a spherical drop is minimum

(c) Gravitational force acts upon the drop

(d) Liquid tends to have the minimum surface area due to surface tension

Concept Questions :-

Surface tension
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It is easy to wash clothes in hot water because its

(a) Surface tension is more

(b) Surface tension is less

(c) Consumes less soap

(d) None of these

Concept Questions :-

Surface tension
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The force required to separate two glass plates of area 10-2m2 with a film of water 0.05 mm thick between them, is (Surface tension of water is 70×10-3 N/m)

(a) 28 N                         (b) 14 N
(c) 50 N                         (d) 38 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

(a) Surface tension of water is very high

(b) Surface tension of water is very low

(c) Viscosity of oil is high

(d) The viscosity of water is high

Concept Questions :-

Surface tension
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Cohesive force is experienced between 

(a) Magnetic substances

(b) Molecules of different substances

(c) Molecules of same substances

(d) None of these

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The property utilized in the manufacture of lead shots is

(a) Specific weight of liquid lead

(b) Specific gravity of liquid lead

(c) Compressibility of liquid lead

(d) Surface tension of liquid lead

Concept Questions :-

Surface tension
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The dimensions of surface tension are

(a) MLT-1                 (b) ML2T-2

(c) ML0T-2                  (d) ML1T-2

Concept Questions :-

Surface tension
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A wooden stick 2m long is floating on the surface of water. The surface tension of water 0.07 N/m. By putting soap solution on one side of the sticks the surface tension is reduced to 0.06 N/m. The net force on the stick will be

(a) 0.07 N                                (b) 0.06 N
(c) 0.01 N                                (d) 0.02 N

Concept Questions :-

Surface tension
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The force required to take away a flat circular plate of radius 2 cm from the surface of water, will be (the surface tension of water is 70 dyne/cm)

(a) 280 π dyne                      (b) 250 π dyne

(c) 140 π dyne                       (d) 210 π dyne

Concept Questions :-

Surface tension
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Surface tension may be defined as 

(a) The work done per unit area in increasing the surface area of a liquid under isothermal condition

(b) The work done per unit area in increasing the surface area of a liquid under adiabatic condition

(c) The work done per unit area in increasing the surface area of a liquid under both isothermal and adiabatic conditions

(d) Free surface energy per unit volume

Concept Questions :-

Surface tension
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