Mechanical Properties of Fluids Test

Result

Mechanical Properties of Fluids Test - 52

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Weekly Quiz Competition

Question 1
4 / -1

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

A
Rn^2/3 σ

B
(n^2/3 – 1 )Rσ

C
(n^1/3 – 1)Rσ

D
4πR² (n^1/3 – 1)σ
Question 2
4 / -1

When 10⁶ small drops coalesce to make a new larger drop then the drop

A
Density increases

B
Density decreases

C
Temperature increases

D
Temperature decreases
Question 3
4 / -1

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

Solution
Question 4
4 / -1

The relation between surface tension T, surface area A and surface energy E is given by

A

B
T = EA

C

D

Solution
Question 5
4 / -1

If a water drop is kept between two glass plates, then its shape is

A

B

C

D
None of these
Question 6
4 / -1

The excess pressure in a bubble of radius R of a gas in a liquid of surface tension S is

A

B

C

D
Question 7
4 / -1

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

A
Air flows from larger bubble into the smaller one

B
The size of the bubbles remains the same

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

D
The air flows from the larger

Solution
Question 8
4 / -1

The excess pressure inside one soap bubble is three times that inside a second soap bubble, then the ratio of their surface areas is

A
1 : 9

B
1 : 3

C
3 : 1

D
1 : 27

Solution
Question 9
4 / -1

When two soap bubbles of radii r₁ and r₂ (r₂ > r₁) coalesce, the radius of curvature of common surface is

A
r₂ – r₁

B

C

D
r₂ + r₁
Question 10
4 / -1

If the surface tension of a soap solution is 0.03 MKS units, then the excess of pressure inside a soap bubble of diameter 6 mm over the atmospheric pressure will be

A
Less than 40 N/m²

B
Greater than 40 N/m²

C
Less than 20 N/m²

D
Greater than 20 N/m²

Solution