Mechanical Properties of Fluids Test

Result

Mechanical Properties of Fluids Test - 7

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Weekly Quiz Competition

Question 1
4 / -1

A beaker of radius 15 cm is filled with a liquid of surface tension 0.75 Nm ^-1. Force across an imaginary diameter on the surface of the liquid is

A
0.075 N

B
1.5 × 10 ^-2 N

C
0.225 N

D
2.25 × 10 ^-2 N

Solution
Question 2
4 / -1

A
1.55 × 10⁵ Pa

B
0.115 × 10⁵ Pa

C
1.4 × 10⁵ Pa

D
1.01 × 10⁵ Pa
Question 3
4 / -1

A square wire frame of size L is dipped in a liquid. On taking out a membrane is formed. If the surface tension of liquid is T, then force acting on a frame will be

A
2T/L

B
4T/L

C
8TL

D
16T/L
Question 4
4 / -1

Work done in forming a liquid drop of radius R is W₁ and that of radius 3R is W₂ . The ratio of work done is

A
1 : 3

B
1 : 2

C
1 : 4

D
1 : 9
Question 5
4 / -1

The surface tension of a liquid is 5 Nm^-1. If a film is held on a ring of area 0.02 m², its total surface energy is about

A
2 × 10 ^-2 J

B
2.5 × 10 ^-3 J

C
2 × 10 ^-1 J

D
3 × 10 ^-1 J

Solution
Question 6
4 / -1

Two rain drops reach the earth with different terminal velocities having ratio 9 : 4. Then, the ratio of their volumes is

A
3 : 2

B
4 : 9

C
9 : 4

D
27 : 8
Question 7
4 / -1

In a turbulent flow, the velocity of the liquid in contact with the walls of the tube is

A
zero

B
maximum

C
in between zero and maximum

D
equal to critical velocity
Question 8
4 / -1

Water is moving with a speed of 5.18 ms ^-1 through a pipe with a cross-sectional area of 4.20 cm². The water gradually descends 9.66 m as the pipe increase in area to 7.60 cm². The speed of flow at the lower level is

A
3.0 ms ^-1

B
5.7 ms ^-1

C
3.82 ms ^-1

D
2.86 ms ^-1
Question 9
4 / -1

A river of salty water is flowing with a velocity 2 ms ^-1. If the density of the water is 1.2 gcc ^-1, then the kinetic energy of each cubic metre of water is

A
2.4 J

B
24 J

C
2.4 KJ

D
4.8 KJ
Question 10
4 / -1

A rectangular vessel when full of water, takes 10 min to be emptied through an orifice in its bottom. How much time will it take to be emptied when half filled with water?

A
9 min

B
7 min

C
5 min

D
3 min

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Re-Attempt Weekly Quiz Competition

Mechanical Properties of Fluids Test - 7

Result

Mechanical Properties of Fluids Test - 7

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Question 1

0.075 N

1.5 × 10 -2 N

0.225 N

2.25 × 10 -2 N

Solution

Question 2

1.55 × 105 Pa

0.115 × 105 Pa

1.4 × 105 Pa

1.01 × 105 Pa

Question 3

2T/L

4T/L

8TL

16T/L

Question 4

1 : 3

1 : 2

1 : 4

1 : 9

Question 5

2 × 10 -2 J

2.5 × 10 -3 J

2 × 10 -1 J

3 × 10 -1 J

Solution

Question 6

3 : 2

4 : 9

9 : 4

27 : 8

Question 7

zero

maximum

in between zero and maximum

equal to critical velocity

Question 8

3.0 ms -1

5.7 ms -1

3.82 ms -1

2.86 ms -1

Question 9

2.4 J

24 J

2.4 KJ

4.8 KJ

Question 10

9 min

7 min

5 min

3 min

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1.5 × 10 ^-2 N

2.25 × 10 ^-2 N

1.55 × 10⁵ Pa

0.115 × 10⁵ Pa

1.4 × 10⁵ Pa

1.01 × 10⁵ Pa

2 × 10 ^-2 J

2.5 × 10 ^-3 J

2 × 10 ^-1 J

3 × 10 ^-1 J

3.0 ms ^-1

5.7 ms ^-1

3.82 ms ^-1

2.86 ms ^-1