Mechanical Properties of Fluids Test

Result

Mechanical Properties of Fluids Test - 11

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Question 1
4 / -1

When a big drop of water is formed from n small drops of water, the energy loss is 3E, where E is the energy of the bigger drop. If R is the radius of the bigger drop and r is the radius of the smaller drop, then number of smaller drops (n)is

A

B

C

D
Question 2
4 / -1

Assume that a drop of liquid evaporates by decrease in its surface energy, so that its temperature remains unchanged. What should be the minimum radius of the drop for this to be possible?
The surface tension is T, density of liquid is ρ and L is its latent heat of vaporisation

A
ρL/T

B

C
T/ρL

D
2T/ρL

Solution
Question 3
4 / -1

A mercury drop of radius 1.0 cm is sprayed into 10⁶ droplets of equal sizes. The energy expended in this process is (surface tension of mercury is equal to 32 × 10^-2 Nm^-1)

A
3.98 ×10^-4 J

B
8.46 × 10^-4 J

C
3.98 × 10^-2 J

D
8.46 × 10^-2 J
Question 4
4 / -1

A
4

B
6

C
7

D
8

Solution
Question 5
4 / -1

The excess pressure inside a spherical drop of radius r of a liquid of surface tension T is

A
directly proportional to r and inversely proportional to T

B
directly proportional to T and inversely proportional to r

C
directly proportional to the product of T and r

D
inversely proportional to the product of T and r
Question 6
4 / -1

Soap bubbles can be formed floating in air by blowing soap solution in air, with the help of a glass tube but not water bubbles. It is because

A
the excess pressure inside water bubble being more due to large surface tension

B
the excess pressure inside water bubble being less due to large surface tension

C
the excess pressure inside water bubble being more due to large viscosity

D
the excess pressure inside water bubble being less due to less viscosity
Question 7
4 / -1

A frame made of metallic wire enclosing a surface area A is covered with a soap film. If the area of the frame of metallic wire is reduced by 50%, the energy of the soap film will be changed by

A
100%

B
75%

C
50%

D
25%
Question 8
4 / -1

A vessel whose bottom has round hole with diameter of 1 mm is filled with water. Assuming that surface tension acts only at hole, then the maximum height to which the water can be filled in vessel without leakage is (surface tension of water = 7.5 ×10^-2 Nm^-1 and g =10 ms ^-2)

A
0.3 cm

B
3 mm

C
3 cm

D
3 m
Question 9
4 / -1

Two soap bubbles combine to form a single bubble. In this process, the change in volume and surface area are respectively V and A. If p is the atmospheric pressure and T is the surface tension of the soap solution,then which of the following relation is true?

A
4pV + 3TA = 0

B
3pV – 4TA = 0

C
4pV – 3TA = 0

D
3pV + 4TA = 0
Question 10
4 / -1

A rain drop of radius 0.3 mm has a terminal velocity of 1 ms^-1 in air. The viscosity of air is 18 ×10^-5 poise. The viscous force on the drop will be

A
16.95 ×10^-9 N

B
1.695 ×10^-9 N

C
10.17 ×10^-9 N

D
101.73 ×10^-9 N

Solution