Surface Tension Test

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Surface Tension Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

A drop of mercury of radius 2 mm is split into 8 identical droplets. Find the increase in surface energy. (Surface tension of mercury is 0.465 J/m²)

A
23.4 μJ

B
18.5 μJ

C
26.8 μJ

D
16.8 μJ

Solution

Increase in surface energy or work done in splitting a big drop 4πR²T(n^1/3−1)

⇒ W = 4π × (2×10⁻³)² × 0.465(8^1/3−1) = 23.4 μJ
Question 2
1 / -0

If two soap bubbles of equal radii r coalesce then the radius of curvature of interface between two bubbles will be

A
r

B
0

C
Infinity

D
1/2r

Solution
Question 3
1 / -0

The angle of contact between glass and mercury is

A
0°

B
30°

C
90°

D
135°

Solution

Mercury causes capillary depression with an angle of contact of about 135⁰ in a clean glass in contact with air.
Question 4
1 / -0

A mercury drop does not spread on a glass plate because the angle of contact between glass and mercury is

A
Acute

B
Obtuse

C
Zero

D
90°

Solution

The mercury does not spread on a glass plate because the angle of contact between glass and mercury is obtuse.
Question 5
1 / -0

The value of contact angle for kerosene with a solid surface.

A
0°

B
90°

C
45°

D
33°

Solution

The angle of contact will be equal to zero as it completely wets the solid surface.
Question 6
1 / -0

Nature of meniscus for liquid of 0⁰ angle of contact

A
Plane

B
Parabolic

C
Semi-spherical

D
Cylindrical

Solution

When angle of contact = 0° then, the meniscus for liquid will be semi-spherical.
Question 7
1 / -0

A liquid wets a solid completely. The meniscus of the liquid in a sufficiently long tube is

A
Flat

B
Concave

C
Convex

D
Cylindrical

Solution

The liquid wets the solid completely, so angle of contact, θ < 90°. Then the meniscus will be concave when θ < 90°.
Question 8
1 / -0

For which of the two pairs, the angle of contact is same

A
Water and glass; glass and mercury

B
Pure water and glass; glass and alcohol

C
Silver and water; mercury and glass

D
Silver and chromium; water and chromium

Solution

Both liquids water and alcohol have same nature (i.e. wet the solid). Hence angle of contact for both is acute
Question 9
1 / -0

If soap bubbles of different radii are in communication with each other

A
Air flows from the larger bubble into the smaller one until the two bubbles are of equal size

B
The sizes of the bubbles remain unchanged

C
Air flows from the smaller into the larger one and larger bubble grows at the expense of the smaller one

D
None of these

Solution

temperature remains constant

so, PV=P'V'

the bubble ith large radius will have more volume and hence less pressure.

So, the Air flows from the smaller into the larger one and larger bubble grows at the expense of the smaller one
Question 10
1 / -0

The surface tension of the soap solution is 25×10⁻³ Nm⁻¹ . The excess pressure inside a soap bubble of diameter 1 cm is

A
10 Pa

B
20 Pa

C
5 Pa

D
None of the above

Solution

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Re-Attempt Weekly Quiz Competition

Surface Tension Test - 6

Result

Surface Tension Test - 6

Score

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Rank

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SHARING IS CARING

Question 1

23.4 μJ

18.5 μJ

26.8 μJ

16.8 μJ

Solution

Question 2

r

0

Infinity

1/2r

Solution

Question 3

0°

30°

90°

135°

Solution

Question 4

Acute

Obtuse

Zero

90°

Solution

Question 5

0°

90°

45°

33°

Solution

Question 6

Plane

Parabolic

Semi-spherical

Cylindrical

Solution

Question 7

Flat

Concave

Convex

Cylindrical

Solution

Question 8

Water and glass; glass and mercury

Pure water and glass; glass and alcohol

Silver and water; mercury and glass

Silver and chromium; water and chromium

Solution

Question 9

Air flows from the larger bubble into the smaller one until the two bubbles are of equal size

The sizes of the bubbles remain unchanged

Air flows from the smaller into the larger one and larger bubble grows at the expense of the smaller one

None of these

Solution

Question 10

10 Pa

20 Pa

5 Pa

None of the above

Solution

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