Physics Chapter 6 Fluid Dynamics Mcqs Test Online Punjab 11th Class

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Question 1 of 12

Physics

1. A rain drop of radius ‘r’ falls in air with a terminal speed vt. What is the terminal speed of a rain drop of radius 2r?

4vt

v

vt

2vt

Question 1 of 12

Question 2 of 12

2. The smooth or steady steam – line flow is known as”

Turbulent flow

None of these

Both a and b

Laminar flow

Question 2 of 12

Question 3 of 12

3. Two capillary tubes A and B of equal radii ra=rb=r and equal length la=lb=l are held horizontally. When the same pressure difference P is maintained across each tube, the rate of flow of water in each is Q. If the tubes are connected series and the same pressure difference P is maintained across the combination, the rate of flow through the combination will be

Q

√2Q

2Q

Q/2

Question 3 of 12

Question 4 of 12

4. The cylinder tube of a spray pump has a radius R, one end of which has ‘n’ number of fine uniform holes, each of radius ‘r’. If the speed of flow of the fluid in the tube is v₁, the speed of ejection of the liquid through the holes id

v/n(R/r)²

v/n(R/r)³

v/n(R/r)

None of these

Question 4 of 12

Question 5 of 12

5. A person standing near the track of a fast moving train has tendency to fall towards it because of:

Vibration due to motion of train

The high speed of train

Some other effect

Gravitation force of attraction between person and trains

Question 5 of 12

Question 6 of 12

6. According to Stoke’s law, drag force depends on

Terminal velocity

Initial velocity

Instantaneous velocity

Final velocity

Question 6 of 12

Question 7 of 12

7. In a test experiment on a model airplane in a wind tunnel. The flow speeds on the lower and upper surface of the wings are ‘v’ and √2v respectively. If the density of air is ‘r’ and the surface area of the wing is given.

1/√2pv²A

√2pv²A

2pv²A

1/2pv²A

Question 7 of 12

Question 8 of 12

8. Eight spherical rain drops of same mass and radius are falling down with a terminal velocity of 6 cm s⁻¹. If they coalesce to form on big drop, what will be its terminal speed? Neglect the buoyancy due to air.

1.5 cm s⁻¹

6 cm s⁻¹

32 cm s⁻¹

24 cm s⁻¹

Question 8 of 12

Question 9 of 12

9. A 3m tall cylinder, full of water, has four identical small holes at height 2.1m, 2.3m and 2.4 meter. The speed of efflux is maximum from

2.3 m high hole

2.2 m high hole

2.1 m high hole

2.4 m high hole

Question 9 of 12

Question 10 of 12

10. Water flows steadily through a horizontal pipe of a variable cross-section. If the pressure at another point where the velocity of fluid flow is 2v₁ consider ‘p’ as density of water.

P + 3/2 pv²

P – 3/2 pv²

P – 2pv²

P + 2pv²

Question 10 of 12

Question 11 of 12

11. A rectangular tank is filled completely with water. When a hole at its bottom is unplugged, the tank is emptied in time T. If the tank is half filled with water, it will be emptied in time.

T/2

T/√3

T/2√2

1/√2

Question 11 of 12

Question 12 of 12

12. With increase of temperature viscosity

Double

Remains same

Increase

Decrease

Question 12 of 12

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