McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 51. |
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» C. 0.515 | |
| 52. |
A flow through an expanding tube at constant rate is called |
| A. | Steady uniform flow |
| B. | Steady non-uniform flow |
| C. | Unsteady uniform flow |
| D. | Unsteady non-uniform flow |
| Answer» B. Steady non-uniform flow | |
| 53. |
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» B. Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc. | |
| 54. |
The loss of head due to friction in a pipe of uniform diameter in which a viscous flow is taking place, is (where RN = Reynold number) |
| A. | 1/RN |
| B. | 4/RN |
| C. | 16/RN |
| D. | 64/RN |
| Answer» C. 16/RN | |
| 55. |
The tendency of a liquid surface to contract is due to the following property |
| A. | Cohesion |
| B. | Adhesion |
| C. | Viscosity |
| D. | Surface tension |
| Answer» D. Surface tension | |
| 56. |
The Newton's law of resistance is based on the assumption that the |
| A. | Planes of the body are completely smooth |
| B. | Space around the body is completely filled with the fluid |
| C. | Fluid particles do not exert any influence on one another |
| D. | All of the above |
| Answer» D. All of the above | |
| 57. |
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» A. Higher surface tension | |
| 58. |
The flow in a pipe is neither laminar nor turbulent when Reynold number is |
| A. | Less than 2000 |
| B. | Between 2000 and 2800 |
| C. | More than 2800 |
| D. | None of these |
| Answer» B. Between 2000 and 2800 | |
| 59. |
The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as |
| A. | Meta center |
| B. | Center of pressure |
| C. | Center of buoyancy |
| D. | Center of gravity |
| Answer» B. Center of pressure | |
| 60. |
Stoke is the unit of |
| A. | Kinematic viscosity in C. G. S. units |
| B. | Kinematic viscosity in M. K. S. units |
| C. | Dynamic viscosity in M. K. S. units |
| D. | Dynamic viscosity in S. I. units |
| Answer» A. Kinematic viscosity in C. G. S. units | |
| 61. |
The vapour pressure over the concave surface is |
| A. | Less man the vapour pressure over the plane surface |
| B. | Equal to the vapour pressure over the plane surface |
| C. | Greater than the vapour pressure over the plane surface |
| D. | Zero |
| Answer» A. Less man the vapour pressure over the plane surface | |
| 62. |
The velocity at which the flow changes from laminar flow to turbulent flow is called |
| A. | Critical velocity |
| B. | Velocity of approach |
| C. | Sub-sonic velocity |
| D. | Super-sonic velocity |
| Answer» A. Critical velocity | |
| 63. |
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» D. Both (B) and (C) | |
| 64. |
A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. Which of the following statement is correct? |
| A. | The pressure on the wall at the liquid level is minimum |
| B. | The pressure on the bottom of the wall is maximum |
| C. | The pressure on the wall at the liquid level is zero, and on the bottom of the wall is maximum |
| D. | The pressure on the bottom of the wall is zero |
| Answer» C. The pressure on the wall at the liquid level is zero, and on the bottom of the wall is maximum | |
| 65. |
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» B. Below it | |
| 66. |
The centre of gravity of the volume of the liquid displaced by an immersed body is called |
| A. | Centre of gravity |
| B. | Centre of pressure |
| C. | Metacentre |
| D. | Centre of buoyancy |
| Answer» D. Centre of buoyancy | |
| 67. |
Gradually varied flow is |
| A. | Steady uniform |
| B. | Non-steady non-uniform |
| C. | Non-steady uniform |
| D. | Steady non- uniform |
| Answer» D. Steady non- uniform | |
| 68. |
The viscosity of water at 20°C is |
| A. | One stoke |
| B. | One centistoke |
| C. | One poise |
| D. | One centipoise |
| Answer» D. One centipoise | |
| 69. |
The velocity of jet of water travelling out of opening in a tank filled with water is proportional to |
| A. | Head of water (h) |
| B. | h² |
| C. | V/T |
| D. | h/2 |
| Answer» C. V/T | |
| 70. |
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. | flv²/2gd |
| B. | flv²/gd |
| C. | 3flv²/2gd |
| D. | 4flv²/2gd |
| Answer» D. 4flv²/2gd | |
| 71. |
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» D. The energy is constant along a streamline but may vary across streamlines | |
| 72. |
The discharge through a convergent mouthpiece is __________ the discharge through an internal mouthpiece of the same diameter and head of water. |
| A. | Equal to |
| B. | One-half |
| C. | Three fourth |
| D. | Double |
| Answer» D. Double | |
| 73. |
Bernoulli equation deals with the law of conservation of |
| A. | Mass |
| B. | Momentum |
| C. | Energy |
| D. | Work |
| Answer» C. Energy | |
| 74. |
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» B. Designing models so that the result can be converted to prototypes | |
| 75. |
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» A. Same as | |
| 76. |
Hot wire anemometer is used to measure |
| A. | Pressure in gases |
| B. | Liquid discharge |
| C. | Pressure in liquids |
| D. | Gas velocities |
| Answer» D. Gas velocities | |
| 77. |
Venturimeter is used to |
| A. | Measure the velocity of a flowing liquid |
| B. | Measure the pressure of a flowing liquid |
| C. | Measure the discharge of liquid flowing in a pipe |
| D. | Measure the pressure difference of liquid flowing between two points in a pipe line |
| Answer» C. Measure the discharge of liquid flowing in a pipe | |
| 78. |
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» D. Weight of the fluid displaced by the body | |
| 79. |
The pressure measured with the help of a pressure gauge is called |
| A. | Atmospheric pressure |
| B. | Gauge pressure |
| C. | Absolute pressure |
| D. | Mean pressure |
| Answer» B. Gauge pressure | |
| 80. |
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» D. All of the above | |
| 81. |
The most economical section of a rectangular channel is one which has hydraulic mean depth or hydraulic radius equal to |
| A. | Half the depth |
| B. | Half the breadth |
| C. | Twice the depth |
| D. | Twice the breadth |
| Answer» A. Half the depth | |
| 82. |
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» D. All of the above | |
| 83. |
The intensity of pressure on an immersed surface __________ with the increase in depth. |
| A. | Does not change |
| B. | Increases |
| C. | Decreases |
| D. | None of these |
| Answer» B. Increases | |
| 84. |
Which of the following statement is correct? |
| A. | In a compressible flow, the volume of the flowing liquid changes during the flow |
| B. | A flow, in which the volume of the flowing liquid does not change, is called incompressible flow |
| C. | When the particles rotate about their own axes while flowing, the flow is said to be rotational flow |
| D. | All of the above |
| Answer» D. All of the above | |
| 85. |
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 |
| A. | Increase |
| B. | Decrease |
| C. | Remain same |
| D. | Increase/decrease depending on depth of immersion |
| Answer» C. Remain same | |
| 86. |
A flow through a long pipe at constant rate is called |
| A. | Steady uniform flow |
| B. | Steady non-uniform flow |
| C. | Unsteady uniform flow |
| D. | Unsteady non-uniform flow |
| Answer» A. Steady uniform flow | |
| 87. |
Choose the wrong statement |
| A. | Viscosity of a fluid is that property which determines the amount of its resistance to a shearing force |
| B. | Viscosity is due primarily to interaction between fluid molecules |
| C. | Viscosity of liquids decreases with increase in temperature |
| D. | Viscosity of liquids is appreciably affected by change in pressure |
| Answer» D. Viscosity of liquids is appreciably affected by change in pressure | |
| 88. |
The unit of dynamic viscosity in S.I. units is |
| A. | N-m/s2 |
| B. | N-s/m2 |
| C. | Poise |
| D. | Stoke |
| Answer» B. N-s/m2 | |
| 89. |
A perfect gas |
| A. | Has constant viscosity |
| B. | Has zero viscosity |
| C. | Is in compressible |
| D. | None of the above |
| Answer» D. None of the above | |
| 90. |
In a free nappe, |
| A. | The pressure below the nappe is atmospheric |
| B. | The pressure below the nappe is negative |
| C. | The pressure above the nappe is atmospheric |
| D. | The pressure above the nappe is negative |
| Answer» A. The pressure below the nappe is atmospheric | |
| 91. |
In a static fluid |
| A. | Resistance to shear stress is small |
| B. | Fluid pressure is zero |
| C. | Linear deformation is small |
| D. | Only normal stresses can exist |
| Answer» D. Only normal stresses can exist | |
| 92. |
One litre of water occupies a volume of |
| A. | 1000 cm3 |
| B. | 250 cm3 |
| C. | 500 cm3 |
| D. | 100 cm3 |
| Answer» A. 1000 cm3 | |
| 93. |
A balloon lifting in air follows the following principle |
| A. | Law of gravitation |
| B. | Archimedes principle |
| C. | Principle of buoyancy |
| D. | All of the above |
| Answer» D. All of the above | |
| 94. |
The ratio of absolute viscosity to mass density is known as |
| A. | Specific viscosity |
| B. | Viscosity index |
| C. | Kinematic viscosity |
| D. | Coefficient of viscosity |
| Answer» C. Kinematic viscosity | |
| 95. |
Reynold's number is the ratio of inertia force to |
| A. | Pressure force |
| B. | Elastic force |
| C. | Gravity force |
| D. | Viscous force |
| Answer» D. Viscous force | |
| 96. |
Metacentric height is given as the distance between |
| A. | The center of gravity of the body and the metacentre |
| B. | The center of gravity of the body and the center of buoyancy |
| C. | The center of gravity of the body and the center of pressure |
| D. | Center of buoyancy and metacentre |
| Answer» A. The center of gravity of the body and the metacentre | |
| 97. |
In a footstep bearing, if the speed of the shaft is doubled, then the torque required to overcome the viscous resistance will be |
| A. | Double |
| B. | Four times |
| C. | Eight times |
| D. | Sixteen times |
| Answer» A. Double | |
| 98. |
The continuity equation is connected with |
| A. | Open channel/pipe flow |
| B. | Compressibility of fluids |
| C. | Conservation of mass |
| D. | Steady/unsteady flow |
| Answer» C. Conservation of mass | |
| 99. |
The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to |
| A. | 1/2 × depth |
| B. | 1/2 × breadth |
| C. | 1/2 × sloping side |
| D. | 1/4 × (depth + breadth) |
| Answer» A. 1/2 × depth | |
| 100. |
The absolute pressure is equal to |
| A. | Gauge pressure + atmospheric pressure |
| B. | Gauge pressure - atmospheric pressure |
| C. | Atmospheric pressure - gauge pressure |
| D. | Gauge pressure - vacuum pressure |
| Answer» A. Gauge pressure + atmospheric pressure | |
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