MCQOPTIONS
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MCQOPTIONS
This section includes 297 Mcqs, each offering curated multiple-choice questions to sharpen your Environmental Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
If H is height of the liquid above the sill, the effect of end contractions, according to Francis formula, is |
| A. | 0.1 H |
| B. | 0.2 H |
| C. | 0.3 H |
| D. | 0.4 H |
| Answer» B. 0.2 H | |
| 52. |
Capillary rise of water is |
| A. | directly proportional to surface tension |
| B. | inversely proportional to water density |
| C. | inversely proportional to diameter of the tube |
| D. | All of these. |
| Answer» E. | |
| 53. |
Practical fluids possess |
| A. | viscosity |
| B. | surface tension |
| C. | compressibility |
| D. | all the above. |
| Answer» E. | |
| 54. |
In C.G.S. system the unit of visocity is |
| A. | dyne |
| B. | joule |
| C. | poise |
| D. | Newton |
| Answer» D. Newton | |
| 55. |
Discharge through a totally submerged orifice, is directly proportional to |
| A. | difference in elevation of water surfaces |
| B. | square root of the difference in elevation of water surface |
| C. | square root of the opening |
| D. | reciprocal of the area of the opening |
| Answer» C. square root of the opening | |
| 56. |
The most efficient channel section, is |
| A. | semi-circular |
| B. | rectangular |
| C. | triangular |
| D. | half hexagon in the form of trapezoid. |
| Answer» E. | |
| 57. |
An orifice is taken as large if |
| A. | (H2 - H1) > H |
| B. | (H2 - H1) > H/4 |
| C. | (H2 - H1) > H/2 |
| D. | (H2 - H1) > H/3 |
| Answer» E. | |
| 58. |
Barometres are used to measure |
| A. | pressure in water channels, pipes etc. |
| B. | difference in pressure at two points |
| C. | atmospheric pressure |
| D. | very low pressure |
| Answer» D. very low pressure | |
| 59. |
Pick up the incorrect statement from to following regarding triangular notch : |
| A. | For measuring low discharge, it gives more accurate result |
| B. | Only one reading (i.e. H) is required for computation of discharge |
| C. | Ventilation is necessary |
| D. | None of these. |
| Answer» D. None of these. | |
| 60. |
A steady uniform flow is through |
| A. | a long pipe at decreasing rate |
| B. | a long pipe at constant rate |
| C. | an expanding tube at constant rate |
| D. | an expanding tube at increasing rate |
| Answer» C. an expanding tube at constant rate | |
| 61. |
For the most economical trapezoidal section of a channel with regards to discharge, the required condition, is |
| A. | half of top width = sloping side |
| B. | hydraulic depth = half the depth |
| C. | perpendiculars drawn from the centre of the top width on to the bottom sloping side, are all equal |
| D. | all the above. |
| Answer» E. | |
| 62. |
Hydraulic coefficient of an orifice means the coefficient of |
| A. | velocity |
| B. | contraction |
| C. | resistance |
| D. | all the above. |
| Answer» E. | |
| 63. |
For exerting a pressure of 4.8 kg/cm², the depth of oil (specific gravity 0.8), should be |
| A. | 40 cm |
| B. | 41 cm |
| C. | 56 cm |
| D. | 60 cm |
| Answer» E. | |
| 64. |
For solving the problems is hydraulic engineering, the velocity used is |
| A. | velocity at the centre of pipe section |
| B. | average velocity of flow over a section |
| C. | mean of the velocities at the centre and that along the pipe surface |
| D. | none of these. |
| Answer» C. mean of the velocities at the centre and that along the pipe surface | |
| 65. |
If the volume of a liquid weighing 3000 kg is 4 cubic metres, 0.75 is its |
| A. | specific weight |
| B. | specific mass |
| C. | specific gravity |
| D. | none of these. |
| Answer» D. none of these. | |
| 66. |
The dimensionless parameter not applicable to flowing liquids, is |
| A. | Reynold number |
| B. | Weber number |
| C. | Pressure coefficient |
| D. | Kinematic viscosity |
| Answer» E. | |
| 67. |
Hydraulic ram is a device |
| A. | for lifting water without an electric motor |
| B. | for accelerating water flow |
| C. | for lifting heavy loads |
| D. | none of these. |
| Answer» B. for accelerating water flow | |
| 68. |
If v1 and v2 are the velocities of flow before and after sudden enlargement in a pipe, the head loss given by Carnot and Borda equation, is |
| A. | (v2² - v1²)/2g |
| B. | (v1 - v2)²/2g |
| C. | (v2 - v1)²/2g |
| D. | (v1 + v2)²/2g |
| Answer» C. (v2 - v1)²/2g | |
| 69. |
The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at its centroid, if |
| A. | area is horizontal |
| B. | area is vertical |
| C. | area is inclined |
| D. | all the above. |
| Answer» E. | |
| 70. |
Uniform flow is said to occur when |
| A. | size and shape of the cross-section in a particular length remain constant |
| B. | size and shape of the cross-section change along a length |
| C. | frictional loss in the particular length of the channel will the more than the drop in its elevation |
| D. | frictional loss in the particular length of the channel, will be less than the drop in elevation. |
| Answer» B. size and shape of the cross-section change along a length | |
| 71. |
Most economical section of a triangular channel, is |
| A. | equilateral triangle |
| B. | right angled triangle |
| C. | isosceles triangle with 45° vertex angle |
| D. | right angled triangle with equal sides. |
| Answer» E. | |
| 72. |
If velocities of fluid particles vary from point to point in magnitude and direction, as well as from instant to instant, the flow is said to be |
| A. | laminar |
| B. | turbulent flow |
| C. | uniform flow |
| D. | non-uniform flow. |
| Answer» C. uniform flow | |
| 73. |
In an open tube, free surface of mercury remains |
| A. | horizontal |
| B. | curved upwards |
| C. | curved downwards |
| D. | none of these. |
| Answer» D. none of these. | |
| 74. |
The value of kinetic energy correction factor (a) for a laminar flow through a circular pipe, is |
| A. | 0.5 |
| B. | 1.0 |
| C. | l.5 |
| D. | 2.0 |
| Answer» E. | |
| 75. |
A fluid particle may possess the displacement of |
| A. | translation |
| B. | rotation |
| C. | distortion |
| D. | all the above. |
| Answer» E. | |
| 76. |
In a centrifugual pump casing, the flow of water leaving the impeller, is |
| A. | rectilinear flow |
| B. | radial flow |
| C. | free vortex motion |
| D. | forced vertex. |
| Answer» D. forced vertex. | |
| 77. |
For most economical rectangular section of a channel, the depth is kept |
| A. | one-fourth of the width |
| B. | three times the hydraulic radius |
| C. | half the width |
| D. | hydraulic mean depth |
| Answer» D. hydraulic mean depth | |
| 78. |
In two dimensional flow the components of velocity are given by u = ax; v = by. The stream lines will be |
| A. | circular |
| B. | parabolic |
| C. | hyperbolic |
| D. | elliptical. |
| Answer» D. elliptical. | |
| 79. |
A non-uniform steady flow is through |
| A. | a long tube at a decreasing rate |
| B. | an expanding tube at constant rate |
| C. | an expanding tube at increasing rate |
| D. | a long pipe at increasing rate. |
| Answer» C. an expanding tube at increasing rate | |
| 80. |
Most economical section of a circular channel for maximum discharge |
| A. | depth of water = 0.95 diameter of circular section |
| B. | hydraulic mean depth = 0.286 diameter of circular section |
| C. | wetted perimeter = 2.6 diameter of circular section |
| D. | all the above. |
| Answer» E. | |
| 81. |
Bernoulli's equation assumes that |
| A. | fluid is non-viscous |
| B. | fluid is homogeneous |
| C. | flow is steady |
| D. | all the above. |
| Answer» E. | |
| 82. |
When a body is totally or partially immersed in a fluid, it is buoyed up by a force equal to |
| A. | weight of the body |
| B. | weight of the fluid displaced by the body |
| C. | weight of the body and fluild displaced by the body |
| D. | difference of weights of the fluid displaced and that of the body |
| Answer» C. weight of the body and fluild displaced by the body | |
| 83. |
If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.1 kg/cm², the pressure at a depth of 2.5 m, is |
| A. | 1 metre of water |
| B. | 2 metres of water |
| C. | 3 metres of water |
| D. | 3.5 metres of water |
| Answer» D. 3.5 metres of water | |
| 84. |
For a most economical rectangular channel, the hydraulic mean depth, is equal to |
| A. | the depth of flow |
| B. | half the depth of flow |
| C. | one-third depth of flow |
| D. | None of these. |
| Answer» C. one-third depth of flow | |
| 85. |
The length of hydraulic jump is roughly |
| A. | 2 to 3 times its height |
| B. | 3 to 5 times its height |
| C. | 5 to 7 times its height |
| D. | None of these. |
| Answer» D. None of these. | |
| 86. |
For the flow of liquid from an open ended tube (or nozzle) leading to the formation of spray of liquid drops, the number generally applied, is |
| A. | Froude number |
| B. | Weber number |
| C. | Reynold number |
| D. | Mach number. |
| Answer» C. Reynold number | |
| 87. |
The discharg formula Q = Cd √2gH x A is used for rectangular |
| A. | small orifices only |
| B. | large orifices only |
| C. | small and large orifices only |
| D. | for all types of orifices. |
| Answer» C. small and large orifices only | |
| 88. |
If the pressure at the inlet of a pipe is 90 kg/cm² and pressure drop over the pipe line is 10 kg/cm², the efficiency of transmission, is |
| A. | 66.6% |
| B. | 77.7% |
| C. | 55.5% |
| D. | 88.8%. |
| Answer» E. | |
| 89. |
Non-over flow double curvature concrete arch, is provided in |
| A. | Bhakra dam |
| B. | Hirakund dam |
| C. | Nagarjuna Sagar dam |
| D. | Idukki dam. |
| Answer» E. | |
| 90. |
The ratio of the hydraulic radius of a pipe running full to the hydraulic radius of a square section of a channel whose side is equal to the diameter of the pipe, is |
| A. | 1 |
| B. | 1/2 |
| C. | 1/3 |
| D. | 3/4 |
| Answer» E. | |
| 91. |
The intensity of pressure due to sudden closure of a valve of a pipe in which water flows with velocity v, is directly proportional to : |
| A. | square root of the bulk modulus of elasticity of water |
| B. | bulk modulus of elasticity of water |
| C. | specific weight of water |
| D. | none of these. |
| Answer» B. bulk modulus of elasticity of water | |
| 92. |
If the total head of the nozzle of a pipe is 37.5 m and discharge is 1 cumec, the power generated is |
| A. | 400 H.P. |
| B. | 450 H.P. |
| C. | 500 H.P. |
| D. | 550 H.P. |
| Answer» D. 550 H.P. | |
| 93. |
An ideal fluid |
| A. | is frictionless and incompressible |
| B. | obeys Newton's law of velocity |
| C. | is similar to gas |
| D. | is very viscous. |
| Answer» B. obeys Newton's law of velocity | |
| 94. |
Reynold number is the ratio of initial force and |
| A. | viscosity |
| B. | elasticity |
| C. | gravitational force |
| D. | surface tension. |
| Answer» B. elasticity | |
| 95. |
A triangular notch is preferred to a rectangular notch because |
| A. | only one reading is required |
| B. | its formula is simple to remember |
| C. | it gives more accurate results for low discharge |
| D. | all the above. |
| Answer» E. | |
| 96. |
On a flow net diagram, the distance between two consecutive steam lines at two successive sections are 1 cm and 0.5 cm respectively. If the velocity at the first section is 1 m/sec, the velocity at the second is |
| A. | 1.0 m/sec |
| B. | 0.5 m/sec |
| C. | 2.0 m/sec |
| D. | 2.5 m/sec |
| Answer» D. 2.5 m/sec | |
| 97. |
The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 98. |
In an inclined position, a venturimeter records |
| A. | more reading |
| B. | less reading |
| C. | same reading |
| D. | none of these. |
| Answer» D. none of these. | |
| 99. |
With a clinging nappe of a weir, the excess discharge, is |
| A. | 6% to 7% |
| B. | 8% to 10% |
| C. | 18% to 20% |
| D. | 25% to 30% |
| Answer» E. | |
| 100. |
Flow in pipes is laminar if Reynold number is |
| A. | less than 2100 |
| B. | more than 3000 |
| C. | between 2100 and 3000 |
| D. | none of these. |
| Answer» B. more than 3000 | |