Mechanical Properties of Fluids Test

Result

Mechanical Properties of Fluids Test - 24

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Weekly Quiz Competition

Question 1
4 / -1

When a drop of water is dropped on oil surface, then

A
It will mix up with oil

B
It spreads in the form of a film

C
It will deform

D
It remains spherical
Question 2
4 / -1

Two pieces of glass plate one upon the other with a little water in between them cannot be separated easily because of

A
Inertia

B
Pressure

C
Surface tension

D
Viscosity
Question 3
4 / -1

The potential energy of a molecule on the surface of liquid compared to one inside the liquid is

A
zero

B
Smaller

C
The same

D
Greater
Question 4
4 / -1

If T is the surface tension of soap solution, the amount of work done in blowing a soap bubble from a diameter D to 2D is

A
2πD²T

B
4πD²T

C
6πD²T

D
8πD²T

Solution
Question 5
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
0

C
Infinity

D
1/2 r

Solution
Question 6
4 / -1

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

Solution
Question 7
4 / -1

The amount of work done in forming a soap film of size 10 cm × 10 cm is (Surface tension T = 3 × 10^–2 N/m )

A
6 × 10^–4 J

B
3 × 10^–4 J

C
6 × 10^–3 J

D
3 × 10^–2 J

Solution
Question 8
4 / -1

A liquid drop of diameter D breaks upto into 27 small drops of equal size. If the surface tension of the liquid is σ, then change in surface energy is

A
πD²σ

B
2πD²σ

C
3πD²σ

D
4πD²σ

Solution
Question 9
4 / -1

One thousand small water drops of equal radius 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

Solution
Question 10
4 / -1

If the radius of a spherical liquid (of surface tension S) drop increases from r to r + ∆r, the corresponding increase in the surface energy is

A
8πr∆rs

B
4πr∆rs

C
16πr∆rs

D
2πr∆rs

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Re-Attempt Weekly Quiz Competition

Mechanical Properties of Fluids Test - 24

Result

Mechanical Properties of Fluids Test - 24

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SHARING IS CARING

Question 1

It will mix up with oil

It spreads in the form of a film

It will deform

It remains spherical

Question 2

Inertia

Pressure

Surface tension

Viscosity

Question 3

zero

Smaller

The same

Greater

Question 4

2πD2T

4πD2T

6πD2T

8πD2T

Solution

Question 5

r

0

Infinity

1/2 r

Solution

Question 6

100 : 1

1000 : 1

10 : 1

1 : 100

Solution

Question 7

6 × 10–4 J

3 × 10–4 J

6 × 10–3 J

3 × 10–2 J

Solution

Question 8

πD2σ

2πD2σ

3πD2σ

4πD2σ

Solution

Question 9

1000 : 1

1 : 1000

10 : 1

1 : 10

Solution

Question 10

8πr∆rs

4πr∆rs

16πr∆rs

2πr∆rs

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2πD²T

4πD²T

6πD²T

8πD²T

6 × 10^–4 J

3 × 10^–4 J

6 × 10^–3 J

3 × 10^–2 J

πD²σ

2πD²σ

3πD²σ

4πD²σ