**Short Questions**

1. A liquid was passed through a pipe and it was found that the rate of influx is equal to the rate of efflux .what information do you get about liquid?

2. A meteor burns into ashes when enters into outer atmosphere. Why?

3. A person is standing near a fast moving train, is there any danger that he towards it?

4. A spherical body is dopped in two different fluids and its terminal velocity is found to be different. Give the reasons?

5. An incompressible liquid is passed through a horizontal pipe and it is observed that the speed of a mass of liquid when emerges is greater than its speed when it enters the pipe. How can it be possible?

6. Briefly explain viscous drag.

7. Define equation of continuity?

8. Define fluid dynamics and Define fluid statics.

9. Define terminal velocity.

10. Define Viscosity and Drag force.

11. Describe any application of Bernoulli’s equation.

12. Describe the method of measuring human blood pressure.

13. Explain how the swing is produced in a fast moving cricket ball.

14. Explain the difference between laminar flow and turbulent flow?

15. Explain the working of carburetor of a motorcar using Bernoulli’s equation?

16. Explain what do you understand by the term viscosity?

17. Explain what you understand by term Viscosity?

18. Explain, how to swing is produced in a fast moving cricket ball?

19. For which position will be maximum blood pressure in the body have the smallest value?(a) standing up right (b)sitting (c)lying horizontally(d)standing on one’s head ?

20. How an aero plane is lifted up?

21. How are the blood pressure and the speed of liquid flow are measure?

22. How does the pulsation in plus show the heart beat?

23. Identify the correct answer. What do you infer from Bernoulli’s theorem? (i) Where the speed of the fluid is high the pressure will be low. (ii)Where the speed of the fluid is high the pressure is also high (iii)This theorem is valid only for turbulent flow of the liquid.

24. In an orbiting space station would the blood pressure in major arteries in the leg ever be greater than the blood pressure in major arteries in the neck

25. Is there any danger that he will fall towards it?

26. It is often seemed that leaves laying on the road start following the fast moving car when it passes through the road. Why?

27. State Bernoulli’s equation?

28. State equation of continuity?

29. State stokes’s law .Is it applicable at high speed?

30. State Torricelli’s theorem.

31. Two boats moving parallel in the same direction are pulled toward each other explain.

32. Two row boats moving parallel in the same direction are pulled towards each other?

33. What are conditions of an ideal fluid?

34. What do you mean by drag force and Venturi effect?

35. What do you mean by terminal velocity?

36. What is co-efficient of viscosity. Write its unite?

37. What is meant by drag force(or viscous drag) (B)What are factor’s upon which the drag force in a small sphere of radius ‘r’ moving through a liquid depend ?

38. What is meant by drag force? What are the factors upon which drag force acting upon a small sphere of radius r ,moving down through a liquid ,depend?

39. What is the function of a Venturi duct in the carburetor of a car?

40. What is torr ? Write down the value of torr in SI system?

41. What is Torricelli’s Theorem?

42. What is venture ‘s’ effect?

43. What is venture-meter?

44. When water falls from a tap, its cross-sectional area decreases as it comes down. Why?

45. Why does a car has oblong shape design?

46. Why does the pipe of paper squeeze when air is blown through it?

47. Why fog droplets appear to be suspended in air?

48. Why fog droplets appear to be suspended in air?

49. Write few lines on blood flow.

50. Write two application of Bernoulli’s theorem?

**Long Questions**

1. Give statement of Bernoulli‟s equation for liquid in motion.

2. State the Stoke‟s Law and write its mathematical form?

3. What do you mean by terminal velocity?

4. State and explain Torricelli‟s Theorem?

5. Write the three characteristics of an ideal fluid?

6. Define terminal velocity and state Torricelli‟s theorem.

7. What is Venturi‟s effect?

8. Define systolic pressure and diastolic pressure.

9. What is meant when we say fluid is non-viscous and incompressible?

10. What is terminal velocity? Show that terminal velocity of a fog droplet is directly proportional to the square of its radius?

11. State and explain Bernoulli‟s equation.

12. What is the relationship between pressure and speed of the fluid in a horizontal pipe system?

13. State and explain equation of continuity?

14. State and explain Torricelli‟s equation.

15. What is venture relation? Explain?

16. Explain what do you understand by the term viscosity?

17. Certain globular protein particle has a density of 1246 kgm⁻³ it falls through pure water (viscosity = 8 x10⁻⁴ Nsm⁻²) with a terminal speed of 3cmh⁻¹. Find the radius of the particle.

18. Water flows through a hose internal diameter is 1cm, at a speed of 1ms⁻¹ what should be the diameter of the nozzle if the water is to emerge at 21 ms⁻¹.

“19. The pipe near the lower end of a large storage tank develops a small leak and a stream of water shoots from it. The top of water tank is 15m above the point of leak.

(a) With what speed does the water rush from the hole?

(b) If the hole has an area of 0.060 cm² how much water flows out in one second?”

20. Water is flowing smoothly through a closed pipe system. At one point the speed of water is 3ms⁻¹ while at another point 3m higher, the speed is 4ms⁻¹. If the pressure is 80kPa at the lower point what is the pressure at the upper end?

21. An air plane wing is designed so that the sped of air across the top of the wing is 450ms⁻¹, the speed of air below the wing is 410ms⁻¹. What is the pressure difference between the top and bottom of the wing? (Density of air = 1.29 kgm⁻³)

22. The radius of the aorta is about 1cm and the blood flowing through it has a speed of about 30cms⁻¹. Calculate the average speed of the blood in the capillaries, using the fact that although each capillary has a diameter of about 8 x 10⁻⁴ cm, there are literally millions of them so that the total cross section is about 2000 (cm)².

23. How large must a heating duct be if air moving 3ms⁻¹ along it can replenish the air in a room of 3000 m³ volumes every 15 min? Assume the air’s density remains constant.

24. An airplane design calls for a lift due to the net force of the moving air on the wing of about 1000Nm⁻² of wing area. Assume that air flows past the wing of an air craft with streamline flow. If the speed of flow past the lower wing surface is 160 ms⁻¹, what is the required speed over the upper surface to give a lift of 1000Nm⁻²? The density of air is 1.29 kgm⁻³ and assume maximum thickness of wing to be one meter.

25. What gauge pressure is required in the city mains for a stream from a fire hose connected to the mains to reach a vertical height of 15m?