The radius of a soap bubble is increased from $\frac{1}{\sqrt{\mathrm{\pi }}}$cm to $\frac{2}{\sqrt{\mathrm{\pi }}}$ cm. If the surface tension of water is 30 dynes per cm, then the work done will be

(a) 180 ergs                          (b) 360 ergs

(c) 720 ergs                          (d) 960 ergs

Concept Questions :-

Surface tension
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Difficulty Level:

If work W is done in blowing a bubble of radius R from a soap solution, then the work done in blowing a bubble of radius 2R from the same solution is

(a) W/2                    (b) 2W

(c) 4W                     (d) $2\frac{1}{3}\mathrm{W}$

Concept Questions :-

Surface tension
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Difficulty Level:

If the surface tension of a liquid is T, the gain in surface energy for an increase in liquid surface by A is

(a) ${\mathrm{AT}}^{-1}$                       (b) $\mathrm{AT}$

(c) ${\mathrm{A}}^{2}\mathrm{T}$                         (d) ${\mathrm{A}}^{2}{\mathrm{T}}^{2}$

Concept Questions :-

Surface tension
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Difficulty Level:

The surface tension of a soap solution is . To blow a bubble of radius 1 cm, the work done is

(a)                         (b)

(c)                        (d)

Concept Questions :-

Surface tension
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Difficulty Level:

The surface tension of a liquid at its boiling point

(a) Becomes zero

(b) Becomes infinity

(c) is equal to the value at room temperature

(d) is half to the value at the room temperature

Concept Questions :-

Surface tension

Difficulty Level:

The surface tension of liquid is 0.5 N/m. If a film is held on a ring of area 0.02 ${\mathrm{m}}^{2}$, its surface energy is

(a)                          (b)

(c)                          (d)

Concept Questions :-

Surface tension
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Difficulty Level:

What is ratio of surface energy of 1 small drop and 1 large drop, if 1000 small drops combined to form 1 large drop ?

(a) 100 : 1                           (b) 1000 : 1
(c) 10 : 1                             (d) 1 : 100

Concept Questions :-

Surface tension
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The amount of work done in forming a soap film of size is 10 cm X 10 cm(Surface tension )

(a)                  (b)

(c)                   (d)

Concept Questions :-

Surface tension
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Difficulty Level:

A liquid drop of diameter D breaks upto into 27 small drops of equal size. If the surface tension of the liquid is $\mathrm{\sigma }$, then change in surface energy is

(a) ${\mathrm{\pi D}}^{2}\mathrm{\sigma }$                          (b) $2{\mathrm{\pi D}}^{2}\mathrm{\sigma }$

(c) $3{\mathrm{\pi D}}^{2}\mathrm{\sigma }$                         (d) $4{\mathrm{\pi D}}^{2}\mathrm{\sigma }$

Concept Questions :-

Surface tension
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Difficulty Level:

One thousand small water drops of equal radii combine to form a big drop. The ratio of final surface energy to the total initial surface energy is

(a) 1000 : 1               (b) 1 : 1000
(c) 10 : 1                   (d) 1 : 10

Concept Questions :-

Surface tension