**Fluid Mechanics: The Science of Hydraulics **

Hydraulics is the study of liquids and their mechanical effects. This includes the motion of fluids and the forces exerted by them. Hydraulic systems are widely used in engineering, manufacturing, and many other industries. In this write-up, we will discuss the basics of hydraulics and fluid mechanics. We will explore how these principles are used in real-world applications.

Applications: Hydraulics is used in a variety of industries and applications. One of the most common uses is in hydraulic machinery. Hydraulic machines use fluid power to perform various tasks. Hydraulic presses, for example, use fluid power to apply pressure to an object. This pressure can be used to crush, cut, or shape the object. Hydraulics is also used in many automotive applications. Hydraulic brakes, for example, use fluid power to stop a vehicle. Hydraulic systems are also used in construction equipment, such as excavators and bulldozers. These machines use fluid power to move their large blades and buckets.

Fluid Mechanics: Fluid mechanics is a branch of physics that helps us to understand how liquids behave. It is also used in many engineering applications. One of the most important concepts in fluid mechanics is fluid pressure. Pressure is the force exerted by a fluid on an object. The pressure of a fluid depends on its density and speed.

Hydraulics and fluid mechanics are essential for many industries and applications. These principles help us to understand how fluids behave and how to design hydraulic systems. Hydraulic systems are used in a variety of industries, such as automotive, construction, and manufacturing.

Following are some of the multiple choice questions on the **Hydraulics and Fluid Mechanics** with answers that will help the students in developing their knowledge.

## Hydraulics and Fluid Mechanics MCQ

### 1. Newton’s law of viscosity is a relationship between

### 3. The surface tension of mercury at normal temperature compared to that of water is

### 4. Non uniform flow occurs when

### 5. Fluid is a substance which offers no resistance to change of

### 6. Surface energy per unit area of a surface is numerically equal to

### 7. Flow of water in a pipe about 3 meters in diameter can be measured by

### 8. Free surface of a liquid tends to contract to the smallest possible area due to force of

### 10. Alcohol is used in manometers because

### 12. When a body floating in a liquid, is displaced slightly, it oscillates about

### 13. Mercury is often used in barometer because

### 14. Operation of McLeod gauge used for low pressure measurement is based on the principle of

### 15. Pressure of the order of 10''' torr can be measured by

### 16. Metacentric height is given as the distance between

### 17. The horse power transmitted through a pipe is maximum when the ratio of loss of head due to friction and total head supplied is

### 18. The ratio of average velocity to maximum velocity for steady laminar flow in circular pipes is

### 19. Specific weight of sea water is more that of pure water because it contains

### 20. Coefficient of contraction for an external cylindrical mouthpiece is

### 21. Resultant pressure of the liquid in the case of an immersed body acts through

### 22. For a floating body to be in equilibrium

### 23. In which of the following the friction drag is generally larger than pressure drag?

### 24. The resultant of all normal pressures acts

### 25. The pressure in Pascals at a depth of 1 m below the free surface of a body of water will be equal to

### 26. The normal stress is same in all directions at a point in a fluid

### 27. The continuity equation pi V,A,= p2V2A2 is based on the following assumption regarding flow of fluid (where pi and p2 are mass densities.)

### 28. According to Bernoulli’s equation for steady ideal fluid flow

### 29. A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm² and a volume of 0.039 m3 at 150 kg/cm². The bulk modulus of elasticity of liquid is

### 30. An open vessel of water is accelerated up an inclined plane. The free water surface will

### 31. An open cubical tank of 2 m side is filled with water. If the tank is rotated with an acceleration such that half of the water spills out, then the acceleration is equal to

### 32. At the centre line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be

### 33. Choose the wrong statement.Alcohol is used in manometer, because

### 34. A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will

### 35. For a floating body to be in stable equilibrium, its metacentre should be

### 36. If 850 kg liquid occupies volume of one cubic meter, men 0.85 represents its

### 37. In a Sutro weir, the discharge is proportional to (where H is head)

### 38. True one-dimensional flow occurs when

### 39. The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the centriod, if

### 40. If a sphere of diameter 1 cm falls in castor oil of kinematic viscosity 10 stokes, with a terminal velocity of 1.5 cm/sec, the coefficient of drag on the sphere is

### 41. The units of viscosity are

### 42. The discharge through a V- notch varies as

### 43. The Prartdtl mixing length is

### 44. To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than

### 45. The peoperty by virtue of which a liquid opposes relative motion between its different layers is called

### 46. Ay between two stream lines represents

### 47. The position of center of pressure on a plane surface immersed vertically in a static mass of fluid is

### 48. A large Roynold number is indication of

### 49. Which of the following is demensionless

### 50. The density of water is 1000 kg/m3 at

### Enjoyed the Quiz. Share this with friends