Fluids Test

Result

Fluids Test - 3

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Angle of contact of a liquid with a solid depends on

A
solid only

B
liquid only

C
both on solid and liquid only

D
orientation of the solid surface in liquid

Solution

Angle of contact of a liquid with a solid depends on both solid and liquid.
Question 2
1 / -0

A U-tube is partially filled with water. Oil which does not mix with water is next poured into one side, until water rises by 25 cm on the other side. If the density of oil is 0.8, the oil level will stand higher than the water level by

A
6.25 cm

B
12.50 cm

C
31.75 cm

D
62.50 cm

Solution

On pouring oll on left side water rises 25 cm from its previous level in right limb of U-tube, creating a difference of levels of water by 50 cm. Let h cm be the height of oit above A in the left limb of U tube.

Difference of levels of oil (C) and water (D) in the two limbs is 62.5 - 50 = 12.5 cm
Question 3
1 / -0

Two solid spheres of same metal but of mass M and 8M fall simultaneously on a viscous liquid and their terminal velocities are v and nv, then value of n is

A
16

B
8

C
4

D
2

Solution

The terminal velocity is given by v, where v ∝ r² (r = radius of the sphere).

The mass of the sphere can be given by m = 4/3 πr³ρ.
Question 4
1 / -0

A liquid will not wet the surface of a solid, if the angle of contact is

A
0°

B
45°

C
60°

D
>90°

Solution

A liquid will not wet if angle of contact θ is >90°
Question 5
1 / -0

Drops of a liquid are usually more spherical in shape than larger drops of same liquid because

A
force of surface tension is equal and opposite to force of gravity

B
force of surface tension predominates the force of gravity

C
force of gravity predominates the force of surface tension

D
force of gravity and surface tension are equal and in same direction

Solution

Smaller drops of liquid are more and more spherical in shape as force of surface tension predominates the force of gravity.
Question 6
1 / -0

A vessel whose bottom has a round hole with diameter 0.1 mm, is filled with water. The maximum height upto which water can be filled without leakage is

(Surface tension of water =75 dyne/cm and g = 1000 cm s^-2)

A
100 cm

B
75 cm

C
50 cm

D
30 cm

Solution
Question 7
1 / -0

A spherical liquid drop of radius R is divided into eight equal droplets. If surface tension is T, then the work done in this process will be

A
2πR²T

B
3πR²T

C
4πR²T

D
5πR²T

Solution

4πR²T
Question 8
1 / -0

There are two hole O₁ and O₂ in a tank of height H . The water emerging from O₁ and O₂ strikes the ground at the same points, as shown in figure. Then

A
H = h₁+h₂

B
H = h₂− h₁

C

D
None of these

Solution
Question 9
1 / -0

With the increase in temperature, the surface tension of a liquid

A
increases

B
decreases

C
remains the same

D
changes erratically

Solution

With increase in temperature surface tension decreases.
Question 10
1 / -0

Water flows in a streamlined manner through a capiliary tube of radius a, the pressure difference being p and the rate of flow Q. If the radius is reduced to a/2 and the pressure increased to 2p, the rate of flow becomes

A
4Q

B
Q

C
Q/4

D
Q/8

Solution