Mechanical Properties of Fluids Test

Result

Mechanical Properties of Fluids Test - 6

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Weekly Quiz Competition

Question 1
4 / -1

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

A
r

B
zero

C
infinity

D
1/2r
Question 2
4 / -1

The work done in blowing a soap bubble of surface tension 0.06 Nm^-1 from 2 cm radius to 5 cm radius is

A
0.004168 J

B
0.003168 J

C
0.003158 J

D
0.004568 J
Question 3
4 / -1

Two drops of equal radius coalesce to form a bigger drop. What is ratio of surface energy of bigger drop to smaller one?

A
2^1/2 : 1

B
1 : 1

C
2^2/3 : 1

D
None of these
Question 4
4 / -1

Energy of bubble is E. If one thousand such bubbles coalesce to form a large bubble then its energy is E₁, then ratio E and E₁ is equal to

A

B

C

D
Question 5
4 / -1

Two mercury drops (each of radius r) merge to form a bigger drop. The surface energy of the bigger drop, if T is the surface tension, is

A
2^5/3π r²T

B
4π r²T

C
2π r²T

D
2^8/3π r²T

Solution
Question 6
4 / -1

Determine the energy stored in the surface of a soap bubble of radius 2.1 cm if its surface tension is 4.5 × 10^-2 Nm^-1.

A
8 mJ

B
2.46 mJ

C
4.93 ×10^-4 J

D
None of these

Solution
Question 7
4 / -1

With an increase in temperature, surface tension of liquid (except molten copper and cadmium)

A
increases

B
remain same

C
decreases

D
first decreases then increases
Question 8
4 / -1

The surface tension of soap solution is 0.03 Nm^-1. The work done in blowing to form a soap bubble of surface area 40 cm² , (in J), is

A
1.2 × 10 ^-4

B
2.4 × 10 ^-4

C
12 × 10 ^-4

D
24 × 10 ^-4

Solution
Question 9
4 / -1

One drop of soap bubble of diameter D breakes into 27 drops having surface tension T. The change in surface energy is

A
2πTD²

B
4πTD²

C
πTD²

D
8πTD²
Question 10
4 / -1

A drop of oil is placed on the surface of water then it will spread as a thin layer, because

A
surface tension tends to give the oil a spherical surface

B
surface tension of water is greater than that of oil

C
both oil and water have nearly equal surface tension

D
oil is lighter than water