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
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Difficulty Level:

If $\sigma$ be the surface tension, the work done in breaking a big drop of radius R in n drops of equal radius is

(a) ${\mathrm{Rn}}^{2/3}\mathrm{\sigma }$                          (b) $\left({\mathrm{n}}^{2/3}-1\right)\mathrm{R\sigma }$

(c) $\left({\mathrm{n}}^{1/3}-1\right)\mathrm{R\sigma }$                    (d) $4{\mathrm{\pi R}}^{2}\left({\mathrm{n}}^{1/3}-1\right)\mathrm{\sigma }$

Concept Questions :-

Surface tension

Difficulty Level:

A big drop of radius R is formed by 1000 small droplets of water, then the radius of small drop is

(a) R/2                                     (b) R/5
(c) R/6                                     (d) R/10

Concept Questions :-

Surface tension
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Difficulty Level:

8000 identical water drops are combined to form a big drop. Then the ratio of the final surface energy to the initial surface energy of all the drops together is
(a) 1 : 10                     (b) 1 : 15
(c) 1 : 20                      (d) 1 : 25

Concept Questions :-

Surface tension
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Difficulty Level:

If work done in increasing the size of a soap film from  to  is  then the surface tension is

(a)               (b)

(c)               (d)

Concept Questions :-

Surface tension
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Difficulty Level:

A mercury drop of radius 1cm is sprayed into ${10}^{6}$ drops of equal size. The energy expended in joules is (surface tension of Mercury is )

(a) 0.057                      (b) 5.7

(c) $5.7×{10}^{-4}$                (d) $5.7×{10}^{-6}$

Concept Questions :-

Surface tension
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Difficulty Level:

When two small bubbles join to form a bigger one, energy is

(a) Released                           (b) Absorbed
(c) Both (a) and (b)                (d) None of these

Concept Questions :-

Surface tension