MCQOPTIONS
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MCQOPTIONS
This section includes 154 Mcqs, each offering curated multiple-choice questions to sharpen your Hydraulics and Fluid Mechanics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The rise of liquid along the walls of a revolving cylinder about the initial level is _________ the depression of the liquid at the axis of rotation. |
| A. | Same as |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» B. Less than | |
| 2. |
Hot wire anemometer is used to measure |
| A. | Pressure in gases |
| B. | Liquid discharge |
| C. | Pressure in liquids |
| D. | Gas velocities |
| Answer» E. | |
| 3. |
Principle of similitude forms the basis of |
| A. | Comparing two identical equipments |
| B. | Designing models so that the result can be converted to prototypes |
| C. | Comparing similarity between design and actual equipment |
| D. | Hydraulic designs |
| Answer» C. Comparing similarity between design and actual equipment | |
| 4. |
Bernoulli equation deals with the law of conservation of |
| A. | Mass |
| B. | Momentum |
| C. | Energy |
| D. | Work |
| Answer» D. Work | |
| 5. |
According to Bernoulli's equation for steady ideal fluid flow |
| A. | Principle of conservation of mass holds |
| B. | Velocity and pressure are inversely proportional |
| C. | Total energy is constant throughout |
| D. | The energy is constant along a streamline but may vary across streamlines |
| Answer» E. | |
| 6. |
According to Darcy's formula, the loss of head due to friction in the pipe is (where f = Darcy's coefficient, l = Length of pipe, v = Velocity of liquid in pipe, and d = Diameter of pipe) |
| A. | flv /2gd |
| B. | flv /gd |
| C. | 3flv /2gd |
| D. | 4flv /2gd |
| Answer» E. | |
| 7. |
The velocity of jet of water traveling out of opening in a tank filled with water is proportional to |
| A. | Head of water (h) |
| B. | h |
| C. | V/T |
| D. | h/2 |
| Answer» D. h/2 | |
| 8. |
Capillary action is due to the |
| A. | Surface tension |
| B. | Cohesion of the liquid |
| C. | Adhesion of the liquid molecules and the molecules on the surface of a solid |
| D. | All of the above |
| Answer» E. | |
| 9. |
In order to increase sensitivity of U-tube manometer, one leg is usually inclined by angle ' '. Sensitivity of inclined tube to sensitivity of U-tube is equal to |
| A. | Sin |
| B. | 1/Sin |
| C. | Cos |
| D. | 1/Cos |
| Answer» C. Cos | |
| 10. |
The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the Centroid, if |
| A. | The area is horizontal |
| B. | The area is vertical |
| C. | The area is inclined |
| D. | All of the above |
| Answer» E. | |
| 11. |
According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to |
| A. | The weight of the body |
| B. | More than the weight of the body |
| C. | Less than the weight of the body |
| D. | Weight of the fluid displaced by the body |
| Answer» B. More than the weight of the body | |
| 12. |
The two important forces for a floating body are |
| A. | Buoyancy, gravity |
| B. | Buoyancy, pressure |
| C. | Buoyancy, inertial |
| D. | Inertial, gravity |
| Answer» B. Buoyancy, pressure | |
| 13. |
When a body floating in a liquid, is displaced slightly, it oscillates about |
| A. | C.G. of body |
| B. | Center of pressure |
| C. | Center of buoyancy |
| D. | Metacentre |
| Answer» E. | |
| 14. |
The property by virtue of which a liquid opposes relative motion between its different layers is called |
| A. | Surface tension |
| B. | Coefficient of viscosity |
| C. | Viscosity |
| D. | Osmosis |
| Answer» D. Osmosis | |
| 15. |
Euler's dimensionless number relates the following |
| A. | Inertial force and gravity |
| B. | Viscous force and inertial force |
| C. | Viscous force and buoyancy force |
| D. | Pressure force and inertial force |
| Answer» E. | |
| 16. |
Gradually varied flow is |
| A. | Steady uniform |
| B. | Non-steady non-uniform |
| C. | Non-steady uniform |
| D. | Steady non-uniform |
| Answer» E. | |
| 17. |
The center of gravity of the volume of the liquid displaced by an immersed body is called |
| A. | Center of gravity |
| B. | Center of pressure |
| C. | Metacenter |
| D. | Center of buoyancy |
| Answer» E. | |
| 18. |
Center of pressure compared to e.g. is |
| A. | Above it |
| B. | Below it |
| C. | At same point |
| D. | Above or below depending on area of body |
| Answer» C. At same point | |
| 19. |
Mercury is often used in barometer because |
| A. | It is the best liquid |
| B. | The height of barometer will be less |
| C. | Its vapour pressure is so low that it may be neglected |
| D. | Both (B) and (C) |
| Answer» E. | |
| 20. |
The surface tension of mercury at normal temperature compared to that of water is |
| A. | More |
| B. | Less |
| C. | Same |
| D. | More or less depending on size of glass tube |
| Answer» B. Less | |
| 21. |
The property of a fluid which enables it to resist tensile stress is known as |
| A. | Compressibility |
| B. | Surface tension |
| C. | Cohesion |
| D. | Adhesion |
| Answer» D. Adhesion | |
| 22. |
Fluid is a substance that |
| A. | Cannot be subjected to shear forces |
| B. | Always expands until it fills any container |
| C. | Has the same shear stress at a point regardless of its motion |
| D. | Cannot remain at rest under action of any shear force |
| Answer» E. | |
| 23. |
If the surface of liquid is convex, men |
| A. | Cohesion pressure is negligible |
| B. | Cohesion pressure is decreased |
| C. | Cohesion pressure is increased |
| D. | There is no cohesion pressure |
| Answer» D. There is no cohesion pressure | |
| 24. |
The resultant upward pressure of the fluid on an immersed body is called |
| A. | Up-thrust |
| B. | Buoyancy |
| C. | Center of pressure |
| D. | All the above are correct |
| Answer» C. Center of pressure | |
| 25. |
A pressure of 25 m of head of water is equal to |
| A. | 25 kN/ m |
| B. | 245 kN/ m |
| C. | 2500 kN/m |
| D. | 2.5 kN/ m |
| Answer» C. 2500 kN/m | |
| 26. |
Choose the wrong statement. Alcohol is used in manometer, because |
| A. | Its vapour pressure is low |
| B. | It provides suitable meniscus for the inclined tube |
| C. | Its density is less |
| D. | It provides longer length for a given pressure difference |
| Answer» B. It provides suitable meniscus for the inclined tube | |
| 27. |
An object having 10 kg mass weighs 9.81 kg on a spring balance. The value of 'g' at this place is |
| A. | 10 m/sec |
| B. | 9.81 m/sec |
| C. | 9.75 m/sec |
| D. | 9 m/sec |
| Answer» B. 9.81 m/sec | |
| 28. |
The unit of viscosity is |
| A. | Meters per sec |
| B. | kg-sec/meter |
| C. | Newton-sec per meter |
| D. | Newton-sec per meter |
| Answer» C. Newton-sec per meter | |
| 29. |
An air vessel is provided at the summit in a siphon to |
| A. | Avoid interruption in the flow |
| B. | Increase discharge |
| C. | Increase velocity |
| D. | Maintain pressure difference |
| Answer» B. Increase discharge | |
| 30. |
When a cylindrical vessel containing liquid is resolved, the surface of the liquid takes the shape of |
| A. | A triangle |
| B. | A paraboloid |
| C. | An ellipse |
| D. | None of these |
| Answer» C. An ellipse | |
| 31. |
A fluid in equilibrium can't sustain |
| A. | Tensile stress |
| B. | Compressive stress |
| C. | Shear stress |
| D. | Bending stress |
| Answer» D. Bending stress | |
| 32. |
Differential manometer is used to measure |
| A. | Pressure in pipes, channels etc. |
| B. | Atmospheric pressure |
| C. | Very low pressure |
| D. | Difference of pressure between two points |
| Answer» E. | |
| 33. |
For a body floating in a liquid the normal pressure exerted by the liquid acts at |
| A. | Bottom surface of the body |
| B. | C.G. of the body |
| C. | Metacenter |
| D. | All points on the surface of the body |
| Answer» E. | |
| 34. |
The loss of head due to viscosity for laminar flow in pipes is (where d = Diameter of pipe, l = Length of pipe, v = Velocity of the liquid in the pipe, = Viscosity of the liquid, and w = Specific weight of the flowing liquid) |
| A. | 4 vl/wd |
| B. | 8 vl/wd |
| C. | 16 vl/wd |
| D. | 32 vl/wd |
| Answer» E. | |
| 35. |
Center of buoyancy is the |
| A. | Centroid of the displaced volume of fluid |
| B. | Center of pressure of displaced volume |
| C. | Does not exist |
| D. | None of the above |
| Answer» B. Center of pressure of displaced volume | |
| 36. |
Dynamic viscosity of most of the gases with rise in temperature |
| A. | Increases |
| B. | Decreases |
| C. | Remain unaffected |
| D. | Unpredictable |
| Answer» B. Decreases | |
| 37. |
The torque required to overcome viscous resistance of a footstep bearing is (where = Viscosity of the oil, N = Speed of the shaft, R = Radius of the shaft, and t = Thickness of the oil film) |
| A. | NR/60t |
| B. | NR /60t |
| C. | NR /60t |
| D. | NR /60t |
| Answer» E. | |
| 38. |
The atmospheric pressure with rise in altitude decreases |
| A. | Linearly |
| B. | First slowly and then steeply |
| C. | First steeply and then gradually |
| D. | Unpredictable |
| Answer» C. First steeply and then gradually | |
| 39. |
The increase in pressure at the outer edge of a drum of radius (r) completely filled up with liquid of density ( ) and rotating at ( ) rad/s is |
| A. | r |
| B. | 2 r |
| C. | r /2 |
| D. | r /4 |
| Answer» D. r /4 | |
| 40. |
For manometer, a better liquid combination is one having |
| A. | Higher surface tension |
| B. | Lower surface tension |
| C. | Surface tension is no criterion |
| D. | High density and viscosity |
| Answer» B. Lower surface tension | |
| 41. |
The tendency of a liquid surface to contract is due to the following property |
| A. | Cohesion |
| B. | Adhesion |
| C. | Viscosity |
| D. | Surface tension |
| Answer» E. | |
| 42. |
Practical fluids |
| A. | Are viscous |
| B. | Possess surface tension |
| C. | Are compressible |
| D. | Possess all the above properties |
| Answer» E. | |
| 43. |
Reynolds number is significant in |
| A. | Supersonics, as with projectile and jet propulsion |
| B. | Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc. |
| C. | Simultaneous motion through two fluids where there is a surface of discontinuity, gravity forces, and wave making effect, as with ship's hulls |
| D. | All of the above |
| Answer» C. Simultaneous motion through two fluids where there is a surface of discontinuity, gravity forces, and wave making effect, as with ship's hulls | |
| 44. |
The mass of 2.5 m 3; of a certain liquid is 2 tonnes. Its mass density is |
| A. | 200 kg/m |
| B. | 400 kg/m |
| C. | 600 kg/m |
| D. | 800 kg/m |
| Answer» E. | |
| 45. |
A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury? |
| A. | 0.5 |
| B. | 0.4 |
| C. | 0.515 |
| D. | 0.5 |
| Answer» D. 0.5 | |
| 46. |
A liquid compressed in cylinder has a volume of 0.04 m 3; at 50 kg/cm 2; and a volume of 0.039 m 3; at 150 kg/cm 2;. The bulk modulus of elasticity of liquid is |
| A. | 400 kg/cm |
| B. | 4000 kg/cm |
| C. | 40 10 kg/cm |
| D. | 40 10 kg/cm |
| Answer» C. 40 10 kg/cm | |
| 47. |
Non uniform flow occurs when |
| A. | The direction and magnitude of the velocity at all points are identical |
| B. | The velocity of successive fluid particles, at any point, is the same at successive periods of time |
| C. | Velocity, depth, pressure, etc. change from point to point in the fluid flow |
| D. | The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane |
| Answer» D. The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane | |
| 48. |
The property of fluid by virtue of which it offers resistance to shear is called |
| A. | Surface tension |
| B. | Adhesion |
| C. | Adhesion |
| D. | Viscosity |
| Answer» E. | |
| 49. |
Dimensions of surface tension are |
| A. | ML T |
| B. | ML T |
| C. | ML r |
| D. | ML T |
| Answer» B. ML T | |
| 50. |
A one dimensional flow is one which |
| A. | Is uniform flow |
| B. | Is steady uniform flow |
| C. | Takes place in straight lines |
| D. | Involves zero transverse component of flow |
| Answer» E. | |