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

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Question 1 of 12

Physics

1. 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

2.2 m high hole

2.1 m high hole

2.4 m high hole

2.3 m high hole

Question 1 of 12

Question 2 of 12

2. 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 2 of 12

Question 3 of 12

3. 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 – 2pv²

P + 3/2 pv²

P – 3/2 pv²

P + 2pv²

Question 3 of 12

Question 4 of 12

4. 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

1/√2pv²A

2pv²A

Question 4 of 12

Question 5 of 12

5. With increase of temperature viscosity

Increase

Double

Remains same

Decrease

Question 5 of 12

Question 6 of 12

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

Terminal velocity

Final velocity

Instantaneous velocity

Initial velocity

Question 6 of 12

Question 7 of 12

7. 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

vt

v

2vt

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

24 cm s⁻¹

6 cm s⁻¹

32 cm s⁻¹

Question 8 of 12

Question 9 of 12

9. 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)³

v/n(R/r)

v/n(R/r)²

None of these

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:

Gravitation force of attraction between person and trains

Vibration due to motion of train

The high speed of train

Some other effect

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

Q

2Q

Q/2

√2Q

Question 11 of 12

Question 12 of 12

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

Turbulent flow

Both a and b

None of these

Laminar flow

Question 12 of 12

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