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

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Question 1 of 12

Physics

1. 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.

√2pv²A

1/2pv²A

2pv²A

1/√2pv²A

Question 1 of 12

Question 2 of 12

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

Instantaneous velocity

Initial velocity

Final velocity

Terminal velocity

Question 2 of 12

Question 3 of 12

3. 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.

6 cm s⁻¹

1.5 cm s⁻¹

24 cm s⁻¹

32 cm s⁻¹

Question 3 of 12

Question 4 of 12

4. 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/√3

T/2

1/√2

T/2√2

Question 4 of 12

Question 5 of 12

5. 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

None of these

v/n(R/r)

Question 5 of 12

Question 6 of 12

6. 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

2vt

vt

Question 6 of 12

Question 7 of 12

7. 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 – 2pv²

P + 3/2 pv²

P + 2pv²

Question 7 of 12

Question 8 of 12

8. 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

2.4 m high hole

2.3 m high hole

2.2 m high hole

2.1 m high hole

Question 8 of 12

Question 9 of 12

9. With increase of temperature viscosity

Increase

Remains same

Double

Decrease

Question 9 of 12

Question 10 of 12

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

The high speed of train

Vibration due to motion of train

Some other effect

Gravitation force of attraction between person and trains

Question 10 of 12

Question 11 of 12

11. 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

√2Q

2Q

Q

Q/2

Question 11 of 12

Question 12 of 12

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

Laminar flow

Turbulent flow

Both a and b

None of these

Question 12 of 12

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