Free Printable Surface Tension 1

1.

If the surface of a liquid is plane, then the angle of contact of the liquid with the walls of the container is

a)

90⁰

b)

0⁰

c)

Acute angle

d)

Obtuse angle

2.

Which of the following is not an effect of surface tension

a)

Capillary rise

b)

Spherical shape of water drops

c)

Spiders skirting on water

d)

Cylindrical shape of water drops

3.

A soap bubble contains two surface layers. What is the excess pressure just inside the first layer when seen from outside the bubble?

a)

S/R

b)

2S/R

c)

4S/R

d)

S/2R

4.

The Unit of surface tension is

a)

Nm

b)

$\frac{N}{m}$

c)

$\frac{N}{m^2}$

d)

$\frac{N}{m^{-1}}$

5.

Which has an obtuse angle of contact

a)

Mercury

b)

Water

c)

Suplpuric acid

d)

Oil

6.

A mercury drop of radius 1 cm is broken into 10⁶ droplets of equal size. The work done is

a)

4.35 × 10^-2 J

b)

4.35 × 10^-3 J

c)

4.35 × 10^-6 J

d)

4.35 × 10^-8 J

7.

The energy needed in breaking a drop of radius R into n drops of radius r is

a)

$(n.4\pi r^2-4\pi R^2)$

b)

$(n.4\pi r3-4\pi R^3)$

c)

$(4\pi r^2-n.4\pi R^2)$

d)

$(4\pi r^3-n.4\pi R^3)$

8.

The dimensional formula of surface tension is

a)

$MT^{-2}$

b)

$M^{-1}T^{-2}$

c)

$MT^{-1}$

d)

$M^{-2}T^{-1}$

9.

The surface tension of water can be reduced by

a)

heating

b)

Adding a detergent

c)

cooling

d)

None of these methods will decrease surface tesnion

10.

How do you feel about your upcoming examinations

a)

Confident

b)

Tense

c)

Cannot say

Surface Tension 1

Total questions: 10

Worksheet time: 13mins

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