McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 1. |
When a body is placed over a liquid, it will sink down if |
| A. | Gravitational force is equal to the up-thrust of the liquid |
| B. | Gravitational force is less than the up-thrust of the liquid |
| C. | Gravitational force is more than the up-thrust of the liquid |
| D. | None of the above |
| Answer» C. Gravitational force is more than the up-thrust of the liquid | |
| 2. |
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» C. Viscosity | |
| 3. |
A weir is said to be narrow-crested weir, if the width of the crest of the weir is __________ half the height of water above the weir crest. |
| A. | Equal to |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» B. Less than | |
| 4. |
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» D. Pressure force and inertial force | |
| 5. |
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» D. Metacentre | |
| 6. |
When the Mach number is between __________ the flow is called super-sonic flow. |
| A. | 1 and 2.5 |
| B. | 2.5 and 4 |
| C. | 4 and 6 |
| D. | 1 and 6 |
| Answer» D. 1 and 6 | |
| 7. |
In an immersed body, centre of pressure is |
| A. | At the centre of gravity |
| B. | Above the centre of gravity |
| C. | Below be centre of gravity |
| D. | Could be above or below e.g. depending on density of body and liquid |
| Answer» C. Below be centre of gravity | |
| 8. |
Steady 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. | The magnitude and direction of the velocity do not change from point to point in the fluid |
| D. | The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane |
| Answer» B. The velocity of successive fluid particles, at any point, is the same at successive periods of time | |
| 9. |
A flow is called super-sonic if the |
| A. | Velocity of flow is very high |
| B. | Discharge is difficult to measure |
| C. | Mach number is between 1 and 6 |
| D. | None of these |
| Answer» C. Mach number is between 1 and 6 | |
| 10. |
In a forced vortex, the velocity of flow everywhere within the fluid is |
| A. | Maximum |
| B. | Minimum |
| C. | Zero |
| D. | Nonzero finite |
| Answer» D. Nonzero finite | |
| 11. |
Mach number is significant in |
| A. | Supersonics, as with projectiles 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 force, and wave making effects, as with ship's hulls |
| D. | All of the above |
| Answer» A. Supersonics, as with projectiles and jet propulsion | |
| 12. |
In order that flow takes place between two points in a pipeline, the differential pressure between these points must be more than |
| A. | Frictional force |
| B. | Viscosity |
| C. | Surface friction |
| D. | All of the above |
| Answer» D. All of the above | |
| 13. |
The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a triangular notch is given by |
| A. | dQ/Q = 3/2 × (dH/H) |
| B. | dQ/Q = 2 × (dH/H) |
| C. | dQ/Q = 5/2 × (dH/H) |
| D. | dQ/Q = 3 × (dH/H) |
| Answer» C. dQ/Q = 5/2 × (dH/H) | |
| 14. |
For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal |
| A. | Ratio of inertial force to force due to viscosity |
| B. | Ratio of inertial force to force due to gravitation |
| C. | Ratio of inertial force to force due to surface tension |
| D. | All the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity |
| Answer» D. All the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity | |
| 15. |
The value of coefficient of velocity for a sharp edged orifice __________ with the head of water. |
| A. | Decreases |
| B. | Increases |
| C. | Remain same |
| D. | None of these |
| Answer» B. Increases | |
| 16. |
If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be |
| A. | Higher than the surface of liquid |
| B. | The same as the surface of liquid |
| C. | Lower than the surface of liquid |
| D. | Unpredictable |
| Answer» C. Lower than the surface of liquid | |
| 17. |
The ratio of the inertia force to the __________ is called Euler's number. |
| A. | Pressure force |
| B. | Elastic force |
| C. | Surface tension force |
| D. | Viscous force |
| Answer» A. Pressure force | |
| 18. |
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» D. Involves zero transverse component of flow | |
| 19. |
According to Manning's formula, the discharge through an open channel is (where M = Manning's constant) |
| A. | A × M × m1/2 × i2/3 |
| B. | A × M × m2/3 × i1/2 |
| C. | A1/2 × M 2/3 × m × i |
| D. | A2/3 × M1/3 × m × i |
| Answer» B. A × M × m2/3 × i1/2 | |
| 20. |
An opening in the side of a tank or vessel such that the liquid surface with the tank is below the top edge of the opening, is called |
| A. | Weir |
| B. | Notch |
| C. | Orifice |
| D. | None of these |
| Answer» B. Notch | |
| 21. |
The property of fluid by virtue of which it offers resistance to shear is called |
| A. | Surface tension |
| B. | Adhesion |
| C. | Cohesion |
| D. | Viscosity |
| Answer» D. Viscosity | |
| 22. |
Coefficient of velocity is defined as the ratio of |
| A. | Actual velocity of jet at vena contracta to the theoretical velocity |
| B. | Area of jet at vena contracta to the area of orifice |
| C. | Actual discharge through an orifice to the theoretical discharge |
| D. | None of the above |
| Answer» A. Actual velocity of jet at vena contracta to the theoretical velocity | |
| 23. |
The mass of 2.5 m3 of a certain liquid is 2 tonnes. Its mass density is |
| A. | 200 kg/m3 |
| B. | 400 kg/m3 |
| C. | 600 kg/m3 |
| D. | 800 kg/m3 |
| Answer» D. 800 kg/m3 | |
| 24. |
A fluid in equilibrium can't sustain |
| A. | Tensile stress |
| B. | Compressive stress |
| C. | Shear stress |
| D. | Bending stress |
| Answer» C. Shear stress | |
| 25. |
When a plate is immersed in a liquid parallel to the flow, it will be subjected to a pressure __________ that if the same plate is immersed perpendicular to the flow. |
| A. | Less than |
| B. | More than |
| C. | Equal to |
| D. | None of these |
| Answer» A. Less than | |
| 26. |
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/sec² |
| B. | 9.81 m/sec² |
| C. | 9.75 m/sec² |
| D. | 9 m/sec |
| Answer» A. 10 m/sec² | |
| 27. |
A flow is called hyper-sonic, if the Mach number is |
| A. | Less than unity |
| B. | Unity |
| C. | Between 1 and 6 |
| D. | None of these |
| Answer» D. None of these | |
| 28. |
Liquids |
| A. | Cannot be compressed |
| B. | Occupy definite volume |
| C. | Are not affected by change in pressure and temperature |
| D. | None of the above |
| Answer» D. None of the above | |
| 29. |
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» B. A paraboloid | |
| 30. |
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» D. Cannot remain at rest under action of any shear force | |
| 31. |
The force exerted by a moving fluid on an immersed body is directly proportional to the rate of change of momentum due to the presence of the body. This statement is called |
| A. | Newton's law of motion |
| B. | Newton's law of cooling |
| C. | Newton's law of viscosity |
| D. | Newton's law of resistance |
| Answer» D. Newton's law of resistance | |
| 32. |
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» C. Cohesion | |
| 33. |
The loss of pressure head in case of laminar flow is proportional to |
| A. | Velocity |
| B. | (Velocity)2 |
| C. | (Velocity)3 |
| D. | (Velocity)4 |
| Answer» A. Velocity | |
| 34. |
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» A. More | |
| 35. |
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» A. Avoid interruption in the flow | |
| 36. |
The unit of viscosity is |
| A. | Metres² per sec |
| B. | kg-sec/metre |
| C. | Newton-sec per metre² |
| D. | Newton-sec per meter |
| Answer» B. kg-sec/metre | |
| 37. |
Select the correct statement |
| A. | Weber's number is the ratio of inertia force to elastic force. |
| B. | Weber's number is the ratio of gravity force to surface tension force. |
| C. | Weber's number is the ratio of viscous force to pressure force. |
| D. | Weber's number is the ratio of inertia force to surface tension force. |
| Answer» D. Weber's number is the ratio of inertia force to surface tension force. | |
| 38. |
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» A. Its vapour pressure is low | |
| 39. |
When a tank containing liquid moves with an acceleration in the horizontal direction, then the free surface of the liquid |
| A. | Remains horizontal |
| B. | Becomes curved |
| C. | Falls on the front end |
| D. | Falls on the back end |
| Answer» C. Falls on the front end | |
| 40. |
A pressure of 25 m of head of water is equal to |
| A. | 25 kN/ m² |
| B. | 245 kN/ m² |
| C. | 2500 kN/m² |
| D. | 2.5 kN/ m² |
| Answer» B. 245 kN/ m² | |
| 41. |
The hammer blow in pipes occurs when |
| A. | There is excessive leakage in the pipe |
| B. | The pipe bursts under high pressure of fluid |
| C. | The flow of fluid through the pipe is suddenly brought to rest by closing of the valve |
| D. | The flow of fluid through the pipe is gradually brought to rest by closing of the valve |
| Answer» C. The flow of fluid through the pipe is suddenly brought to rest by closing of the valve | |
| 42. |
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» B. Buoyancy | |
| 43. |
When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as |
| A. | Narrow-crested weir |
| B. | Broad-crested weir |
| C. | Ogee weir |
| D. | Submerged weir |
| Answer» D. Submerged weir | |
| 44. |
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» C. Cohesion pressure is increased | |
| 45. |
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» B. First slowly and then steeply | |
| 46. |
Dynamic viscosity of most of the gases with rise in temperature |
| A. | Increases |
| B. | Decreases |
| C. | Remain unaffected |
| D. | Unpredictable |
| Answer» A. Increases | |
| 47. |
According to Bernoulli's equation |
| A. | Z + p/w + v²/2g = constant |
| B. | Z + p/w - v²/2g = constant |
| C. | Z - p/w + v²/2g = constant |
| D. | Z - p/w - v²/2g = constant |
| Answer» A. Z + p/w + v²/2g = constant | |
| 48. |
Newton's law of viscosity is a relationship between |
| A. | Pressure, velocity and temperature |
| B. | Shear stress and rate of shear strain |
| C. | Shear stress and velocity |
| D. | Rate of shear strain and temperature |
| Answer» B. Shear stress and rate of shear strain | |
| 49. |
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» D. Difference of pressure between two points | |
| 50. |
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» C. Velocity, depth, pressure, etc. change from point to point in the fluid flow. | |
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