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.
| 101. |
On an inclined plane, centre of pressure is located |
| A. | at the centroid |
| B. | above the centroid |
| C. | below the centroid |
| D. | anywhere. |
| Answer» D. anywhere. | |
| 102. |
To avoid an interruption in the flow of a syphon, an air vessel is provided |
| A. | at the inlet |
| B. | at the outlet |
| C. | at the summit |
| D. | at any point between intet and outlet. |
| Answer» D. at any point between intet and outlet. | |
| 103. |
The flow in which each liquid particle has a definite path and the paths of adjacent particles do not cross each other, is called |
| A. | stream line flow |
| B. | uniform flow |
| C. | steady flow |
| D. | turbulent flow. |
| Answer» B. uniform flow | |
| 104. |
For mountaneous regions having steep slope, wagons for carrying liquid are made with bottom |
| A. | parallel to the road surface |
| B. | parallel to the horizontal surface |
| C. | inclined upward while moving upwards |
| D. | inclined downward while moving downwards. |
| Answer» C. inclined upward while moving upwards | |
| 105. |
An open container filled with water is moved vertically upward with a uniform linear acceleration. The pressure at its bottom will be |
| A. | greater than static pressure |
| B. | equal to static pressure |
| C. | lesser than static pressure |
| D. | none of these. |
| Answer» B. equal to static pressure | |
| 106. |
To measure very low pressure, we use |
| A. | barometers |
| B. | piezometers |
| C. | manometers |
| D. | differential manometers. |
| Answer» D. differential manometers. | |
| 107. |
Liquids |
| A. | cannot be compressed |
| B. | do not occupy definite shape |
| C. | are not affected by change in pressure and temperature |
| D. | none of these. |
| Answer» C. are not affected by change in pressure and temperature | |
| 108. |
Falling drops of water become spheres due to |
| A. | adhesion |
| B. | cohesion |
| C. | surface tension |
| D. | viscosity. |
| Answer» D. viscosity. | |
| 109. |
Total pressure on the top of a closed cylindrical vessesl completely filled with liquid, is directly proportional to |
| A. | radius |
| B. | (radius)² |
| C. | (radius)³ |
| D. | (radius)⁴ |
| Answer» E. | |
| 110. |
For the most economical trapezoidal open channel, |
| A. | half of the top width must be equal to one of the sloping sides |
| B. | the hydraulic mean depth must be equal to half the depth of flow |
| C. | the semicircle drawn with top width as diameter must touch the three sides of the channel |
| D. | All of these. |
| Answer» E. | |
| 111. |
A closed cylindrical vessel of 100 cm diameter and 200 cm high is completely filled with a liquid (sp. weight 1600 kg/m³) when rotated about its vertical axis at 100 r.p.m. The total pressure on its lid, is |
| A. | 459 kg |
| B. | 549 kg |
| C. | 945 kg |
| D. | 954 kg |
| Answer» E. | |
| 112. |
Hydraulic radius is equal to |
| A. | area divided by the square of wetted perimeter |
| B. | area divided by wetted perimeter |
| C. | wetted perimeter divided by area |
| D. | square root of the area. |
| Answer» C. wetted perimeter divided by area | |
| 113. |
The flow is called rotational if its velocity normal to the plane of area is equal to |
| A. | angular velocity vector |
| B. | twice the angular velocity vector |
| C. | thrice the angular velocity vector |
| D. | none of these. |
| Answer» C. thrice the angular velocity vector | |
| 114. |
Maximum efficiency of transmission of power through a pipe, is |
| A. | 25% |
| B. | 33.3% |
| C. | 50% |
| D. | 66.67%. |
| Answer» E. | |
| 115. |
In a two dimensional flow if the components of the velocity are u = ax ; v = by, the point where no motion occurs, is known as |
| A. | critical point |
| B. | neutral point |
| C. | stagnation point |
| D. | stationary point |
| Answer» D. stationary point | |
| 116. |
The ratio of the inertia and gravitational force acting in any flow, ignoring other forces, is called |
| A. | Euler number |
| B. | Frode number |
| C. | Reynold number |
| D. | Weber number. |
| Answer» C. Reynold number | |
| 117. |
Inside pressure in a hollow soap bubble in the air is : (where d is the diameter of the bubble) |
| A. | 4σ/d |
| B. | 6σ/d |
| C. | 2σ/d |
| D. | 8σ/d |
| Answer» E. | |
| 118. |
When the whole fluid mass rotates either due to fluid pressure or gravity or rotation previously imparted, the motion is known as |
| A. | free vortex |
| B. | forced vortex |
| C. | non-potential vortex |
| D. | rotational vortex. |
| Answer» B. forced vortex | |
| 119. |
Due to decrease of diameter of the droplet, inside pressure intensity |
| A. | increases |
| B. | decreases |
| C. | remains unaffected |
| D. | None of these. |
| Answer» B. decreases | |
| 120. |
The best side slope for most economical trapezoidal section, is |
| A. | 30° |
| B. | 45° |
| C. | 60° |
| D. | None of these. |
| Answer» D. None of these. | |
| 121. |
Specific weight of liquid |
| A. | remains constant at every place |
| B. | does not remain constant at every place |
| C. | varies from place to place on the earth |
| D. | does not vary on any other planet. |
| Answer» E. | |
| 122. |
The ratio of maximum velocity to average velocity of viscous fluid through a circular pipe is |
| A. | 0.5 |
| B. | 0.75 |
| C. | 1.25 |
| D. | 2.00 |
| Answer» E. | |
| 123. |
The centre of pressure of a vertical plane immersed in a liquid is at |
| A. | centre of higher edge |
| B. | centre of lower edge |
| C. | centroid of the area |
| D. | none of these. |
| Answer» E. | |
| 124. |
To avoid the force of surface tension in an inclined manometer, the minimum angle of inclination is |
| A. | 2° |
| B. | 3° |
| C. | 4° |
| D. | 5° |
| Answer» D. 5° | |
| 125. |
The upper surface of the weir over which water flows, is known as |
| A. | vein |
| B. | nappe |
| C. | sill |
| D. | none of these. |
| Answer» D. none of these. | |
| 126. |
If H is the depth of water retained by a vertical wall, the height of centre of pressure above the bottom is |
| A. | H/2 |
| B. | H/3 |
| C. | 2H/3 |
| D. | H/5 |
| Answer» B. H/3 | |
| 127. |
The thickness of a sharp crested weir is kept less than |
| A. | one-third of the height of water on the sill |
| B. | one-half of the height of water on the sill |
| C. | one-fourth of the height of water on the sill |
| D. | two-third of the height of water on the sill |
| Answer» C. one-fourth of the height of water on the sill | |
| 128. |
The momentum correction factor (β) for the viscous flow through a circular pipe is |
| A. | 1.25 |
| B. | 1.33 |
| C. | 1.50 |
| D. | 1.66 |
| Answer» C. 1.50 | |
| 129. |
Hydraulic grade line |
| A. | remains above the centre line of conduit |
| B. | remains below the centre line of conduit |
| C. | remains parallel to the centre line of conduit |
| D. | may be above or below the centre line of conduit. |
| Answer» E. | |
| 130. |
To avoid vapourisation, pipe lines are laid over the ridge so that these are above the hydraulic gradient line, not more than |
| A. | 2.4 m |
| B. | 6.4 m |
| C. | 10.0 m |
| D. | 5.0 m. |
| Answer» C. 10.0 m | |
| 131. |
The specific weight of water is 1000 kg/m³ |
| A. | at normal pressure of 760 mm |
| B. | at 4°C temperature |
| C. | at mean sea level |
| D. | all the above. |
| Answer» E. | |
| 132. |
Molecules of fluids get attracted due to |
| A. | capillarity action |
| B. | surface tension |
| C. | adhesion |
| D. | cohesion |
| Answer» D. cohesion | |
| 133. |
The ratio of the percentage error in the discharge and percentage error in the measurement of head, over rectangular notch, is |
| A. | 1/2 |
| B. | 2/3 |
| C. | 3/2 |
| D. | 3/4 |
| Answer» D. 3/4 | |
| 134. |
Cappoletti weir is a |
| A. | rectangular weir whose length is kept 3 times the height of the water above sill |
| B. | triangular weir whose notch angle is 90° |
| C. | trapezoidal weir, whose sides slope 1 horizontal to 2 verticals |
| D. | a combination of rectangular and triangular weirs. |
| Answer» D. a combination of rectangular and triangular weirs. | |
| 135. |
The ratio of the inertia and viscous forces acting in any flow, ignoring other forces, is called |
| A. | Euler number |
| B. | Frode number |
| C. | Reynold number |
| D. | Weber number. |
| Answer» D. Weber number. | |
| 136. |
A body of dimensions 1.5 m x 1.0 m x 2 m weighs 3000 kg in water. Its specific gravity is |
| A. | 0.8 |
| B. | 0.9 |
| C. | 1.0 |
| D. | 1.1 |
| Answer» E. | |
| 137. |
A rectangular channel 6 m wide and 3 m deep and having a bed slope as 1 in 2000 is running full. If Chezy's constant C = 54.8, pick up the correct specification of the channel from the following : |
| A. | hydraulic mean depth = 1.5 m |
| B. | Velocity of flow = 1.5 m/sec |
| C. | Rate of flow = 27 m³/sec |
| D. | All the above. |
| Answer» E. | |
| 138. |
The rise of the liquid along the walls of a revolving cylinder above the initial level, is |
| A. | greater than the depression of the liquid at the axis of rotation |
| B. | lesser than the depression of the liquid at the axis of rotation |
| C. | the same as the depression of the liquid at the axis of rotation |
| D. | none of these. |
| Answer» D. none of these. | |
| 139. |
The value of momentum correction factor (β) for a laminar flow through a circular pipe, is |
| A. | 1/2 |
| B. | 2/3 |
| C. | 3/4 |
| D. | 4/3 |
| Answer» E. | |
| 140. |
A pipe of 0.1 m² cross sectional area suddenly enlarges to 0.3 m² cross-sectional area. If the discharge of the pipe is 0.3 m³ /sec, the head loss is |
| A. | 2/g m of water |
| B. | g/2 m of water |
| C. | 1g m of water |
| D. | √g m of water. |
| Answer» B. g/2 m of water | |
| 141. |
Mercury is generally used in barometers because |
| A. | its vaour pressure is practically zero |
| B. | the height of the barometer will be less |
| C. | it is a best liquid |
| D. | both (a) and (b) above |
| Answer» E. | |
| 142. |
The flow in open channel is said to be subcritical if the Froude number is |
| A. | less than 1.0 |
| B. | equal to 1.0 |
| C. | greater than 1.0 |
| D. | none. |
| Answer» B. equal to 1.0 | |
| 143. |
In pipe lines, a surge tank is provided |
| A. | to relieve the pressure due to water hammer |
| B. | to provide additional water head |
| C. | to overflow the pipe line when suddenly closed |
| D. | to remove the frictional loss in pipe. |
| Answer» B. to provide additional water head | |
| 144. |
The phenomenon occuring in an open channel when a rapidly flowing stream abruptly changes to a slowly flowing stream causing a distinct rise of liquid surface, is |
| A. | water hammer |
| B. | hydraulic jump |
| C. | critical discharge |
| D. | none of these. |
| Answer» C. critical discharge | |
| 145. |
A rise or fall of liquid in a glass tube of a very small diameter when dipped is |
| A. | directly proportional to the force per unit length of periphery |
| B. | direcly proportional to the sine of the angle of contact |
| C. | directly proportional to the specific weight of liquid |
| D. | inversely proportional to the diameter of the glass tube. |
| Answer» D. inversely proportional to the diameter of the glass tube. | |
| 146. |
A floating body attains stable equilibrium if its metacentre is |
| A. | at the centroid |
| B. | above the centroid |
| C. | below the centroid |
| D. | anywhere. |
| Answer» C. below the centroid | |
| 147. |
In C.G.S. system the units of kinematic viscosity, is |
| A. | stoke |
| B. | poise |
| C. | Newton |
| D. | none of these. |
| Answer» B. poise | |
| 148. |
Equation of continuity of flow is based on the principle of conservation of |
| A. | mass |
| B. | momentum |
| C. | force |
| D. | none of these. |
| Answer» B. momentum | |
| 149. |
The discharge over a Cipolletti weir of length 2.185 m when the head over the weir is 1 m, is |
| A. | 2.0 m³ |
| B. | 2.5 m³ |
| C. | 3.0 m³ |
| D. | 4.0 m³. |
| Answer» E. | |
| 150. |
If jet of water coming out from a nozzle with a velocity 9.81 m/s, the angle of elevation being 30°, the time to reach the highest point is |
| A. | 0.25 s |
| B. | 0.50 s |
| C. | 1.0 s |
| D. | 1.5 s. |
| Answer» C. 1.0 s | |