McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 101. |
The spacing of bars for perforations in coarse screens used for the treatment of sewage, is |
| A. | 20 mm |
| B. | 30 mm |
| C. | 40 mm |
| D. | 50 mm |
| Answer» D. 50 mm | |
| 102. |
The pH value of fresh sewage is usually |
| A. | Equal to 7 |
| B. | More than 7 |
| C. | Less than 7 |
| D. | Equal to zero |
| Answer» B. More than 7 | |
| 103. |
The maximum depth of sedimentation tanks, is kept |
| A. | 3 m |
| B. | 3.5 m |
| C. | 4 m |
| D. | 4.5 m |
| Answer» A. 3 m | |
| 104. |
Lead caulked joints are used for laying |
| A. | Stone ware pipes |
| B. | Earthenware pipes |
| C. | C.I. pipes |
| D. | G.I. pipes |
| Answer» B. Earthenware pipes | |
| 105. |
If D is the diameter of a circular sewer and D' is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is |
| A. | D' = 0.64 D |
| B. | D' = 0.74 D |
| C. | D' = 0.84 D |
| D. | D' = 0.94 D |
| Answer» C. D' = 0.84 D | |
| 106. |
The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer may be |
| A. | 0.9 cm |
| B. | 1.2 m |
| C. | 1.5 m |
| D. | > 1.5 m |
| Answer» D. > 1.5 m | |
| 107. |
The quantity of liquid waste which flows in sewers during the period of rainfall, is known |
| A. | Sanitary sewage |
| B. | Industrial waste |
| C. | Storm sewage |
| D. | None of these |
| Answer» C. Storm sewage | |
| 108. |
Nitrogen cycle of sewage, is |
| A. | Liberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen |
| B. | Liberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates |
| C. | Liberation of nitrogen-formation of nitrates-formation of nitrites-liberation of ammonia |
| D. | Formation of nitrates-formation of nitrites-liberation of nitrates-liberation of nitrates |
| Answer» A. Liberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen | |
| 109. |
Depletion of ozone layer in the outer atmosphere may cause |
| A. | Lung cancer |
| B. | Skin cancer |
| C. | Bronchitis |
| D. | Heart disorder |
| Answer» B. Skin cancer | |
| 110. |
The minimum diameter of a sewer is kept |
| A. | 10 cm |
| B. | 15 cm |
| C. | 20 cm |
| D. | 25 cm |
| Answer» B. 15 cm | |
| 111. |
Which one of the following gases is most significant as air pollutant? |
| A. | Carbondioxide (B) (C) (D) |
| B. | Oxygen |
| C. | Nitrogen |
| D. | Sulphur-dioxide |
| Answer» D. Sulphur-dioxide | |
| 112. |
Hazen's formula VS = 418 (GS - Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter |
| A. | Less than 0.01 mm |
| B. | Less than 0.05 mm |
| C. | Less than 0.1 mm |
| D. | Greater than 0.1 mm |
| Answer» D. Greater than 0.1 mm | |
| 113. |
For sewers, inverted siphon is provided for |
| A. | One pipe |
| B. | Two pipes |
| C. | Three pipes |
| D. | Four pipes |
| Answer» C. Three pipes | |
| 114. |
For large sewers, maximum distance between manholes may be |
| A. | 50 m |
| B. | 100 m |
| C. | 200 m |
| D. | 300 m |
| Answer» D. 300 m | |
| 115. |
In sewers designed with self cleansing velocity, |
| A. | The bottom is silted |
| B. | The bottom is scoured |
| C. | Both silting and scouring occur at the bottom |
| D. | Neither silting nor scouring occurs at the bottom |
| Answer» D. Neither silting nor scouring occurs at the bottom | |
| 116. |
The value of Chezy's constant C = 157.6/(1.81 + K/ 𝒓 ) is used in |
| A. | Chezy's formula |
| B. | Bazin's formula |
| C. | Kutter's formula |
| D. | Manning's formula |
| Answer» B. Bazin's formula | |
| 117. |
Pathogens (or pathogenic bacteria’s) in water may cause |
| A. | Typhoid |
| B. | Cholera |
| C. | Dysentery |
| D. | All the above |
| Answer» D. All the above | |
| 118. |
The rate of accumulation of sludge per person per year, is |
| A. | 10 litres (B) (C) (D) |
| B. | 15 litres |
| C. | 20 litres |
| D. | 25 litres |
| Answer» C. 20 litres | |
| 119. |
The screens are fixed |
| A. | Perpendicular to the direction of flow |
| B. | Parallel to the direction of flow |
| C. | At an angle 30° to 60° to the direction of flow |
| D. | None of these |
| Answer» C. At an angle 30° to 60° to the direction of flow | |
| 120. |
In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient, |
| A. | Is only provided |
| B. | Is doubled |
| C. | Is trebled |
| D. | Is not enough |
| Answer» B. Is doubled | |
| 121. |
In detritus tanks |
| A. | Flow velocity is kept 0.09 m/ |
| B. | Detention period is kept 3 to 4 minutes |
| C. | Organic and inorganic materials are separated |
| D. | All the above |
| Answer» D. All the above | |
| 122. |
The flow velocity in detritus tanks is |
| A. | 0.05 m/sec |
| B. | 0.09 m/sec |
| C. | 1.25 m/sec |
| D. | None of these |
| Answer» B. 0.09 m/sec | |
| 123. |
If the side of a square sewer is 1000 mm, the diameter of a hydraulically equivalent circular section, is |
| A. | 1045 mm |
| B. | 1065 mm |
| C. | 1075 mm |
| D. | 1095 mm |
| Answer» D. 1095 mm | |
| 124. |
A nuisance is experienced in diluting water if dilution factor is less than |
| A. | 100 |
| B. | 60 |
| C. | 40 |
| D. | 20 |
| Answer» D. 20 | |
| 125. |
A manhole is generally provided at each |
| A. | Bend |
| B. | Junction |
| C. | Change of gradient |
| D. | All the above |
| Answer» D. All the above | |
| 126. |
The asbestos cement pipes are generally laid |
| A. | Horizontally |
| B. | Vertically |
| C. | At an angle of 30° |
| D. | At an angle of 60° |
| Answer» B. Vertically | |
| 127. |
The design period in years for pumping plants, is |
| A. | ) 1 |
| B. | 2 to 3 |
| C. | 3 to 5 |
| D. | 5 to 10 |
| Answer» D. 5 to 10 | |
| 128. |
Design period of 40 to 50 years is adopted for |
| A. | Branch sewers |
| B. | Main sewers |
| C. | Trunk sewers |
| D. | All the above |
| Answer» D. All the above | |
| 129. |
In very first stage of decomposition of the organic matter in sewage |
| A. | Nitrites are formed |
| B. | Nitrates are formed |
| C. | Carbondioxide is formed |
| D. | Ammonia is formed |
| Answer» D. Ammonia is formed | |
| 130. |
In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through nonmonsoon periods, is |
| A. | 5 |
| B. | 10 |
| C. | 15 |
| D. | 20 |
| Answer» D. 20 | |
| 131. |
The self-cleansing velocity of water flowing through pipe lines, is |
| A. | 2 metres/sec |
| B. | 1 metre/sec |
| C. | 0.5 metre/sec |
| D. | 0.25 metre/sec |
| Answer» A. 2 metres/sec | |
| 132. |
In case of sewer lines |
| A. | Water test is carried out to check water tightness of the joints |
| B. | Test for straightness is carried out with the help of a lamp and mirror |
| C. | Obstruction test is carried out with the help of smooth ball of diameter 13 mm |
| D. | All the above |
| Answer» D. All the above | |
| 133. |
The normal values of over flow rates for secondary sedimentation tanks, ranges between |
| A. | 25,000 to 35,000 litres/sqm/day |
| B. | 40,000 to 50,000 litres/sqm/day |
| C. | 50,000 to 60,000 litres/sqm/day |
| D. | 80,000 to 10,000 litres/sqm/day |
| Answer» A. 25,000 to 35,000 litres/sqm/day | |
| 134. |
A manhole is classified as shallow if its depth is between |
| A. | 0.4 to 0.5 m |
| B. | 0.5 to 0.7 m |
| C. | 0.7 to 0.9 m |
| D. | 0.9 to 1.20 m |
| Answer» C. 0.7 to 0.9 m | |
| 135. |
The first stage of neutral process of sludge digestion, is |
| A. | Acid fermentation |
| B. | Acid regression |
| C. | Alkaline fermentation |
| D. | None of these |
| Answer» A. Acid fermentation | |
| 136. |
The formula V = (1/n) r2/3 𝒔 used for determining flow velocities in sewers is known as, |
| A. | Chezy's formula |
| B. | Bazin's formula |
| C. | Kutter's formula |
| D. | Manning's formula |
| Answer» D. Manning's formula | |
| 137. |
In sewers the highest non-scouring velocity is achieved in |
| A. | Glazed bricks sewers |
| B. | Cast iron sewers |
| C. | Cement concrete sewers |
| D. | Stone ware sewers |
| Answer» A. Glazed bricks sewers | |
| 138. |
When the reduced level of the water source is higher than the reduced level of the consumer's place, water is generally supplied |
| A. | By pumping system |
| B. | By gravitational system |
| C. | Both (a) and (b) |
| D. | All the above |
| Answer» B. By gravitational system | |
| 139. |
Surcharge storage zone of a reservoir, is |
| A. | Below dead storage (B) (C) (D) |
| B. | Between dead storage and useful storage |
| C. | Above useful storage |
| D. | Also known as valley storage |
| Answer» C. Above useful storage | |
| 140. |
In pressure supply mains, water hammer pressure is reduced by providing |
| A. | Sluice valves |
| B. | Air valves |
| C. | Pressure relief valves |
| D. | None of these |
| Answer» C. Pressure relief valves | |
| 141. |
Specific capacity or yield of wells, is generally expressed, as |
| A. | m 3 per sec |
| B. | m 3 /hour |
| C. | m 3 /hour/m2 |
| D. | m 3 /hour/m2 /m |
| Answer» D. m 3 /hour/m2 /m | |
| 142. |
Turbidity of raw water is a measure of |
| A. | Suspended solids |
| B. | Acidity of water |
| C. | B.O.D. |
| D. | None of these |
| Answer» A. Suspended solids | |
| 143. |
If the chosen diameter of a pipe, is less than the economical diameter |
| A. | Cost of pipe will be less |
| B. | Head loss will be high |
| C. | Cost of pumping will be more than saving |
| D. | All the above |
| Answer» D. All the above | |
| 144. |
While determining the yield of open wells by the pumping test |
| A. | Velocity of recharging water, increases with depression head |
| B. | Depression head resulting at critical velocity, is called critical depression head |
| C. | Working head is generally limited to 1/3 rd of the critical depression head |
| D. | Maximum safe yield of an open well, is expected at critical depression head |
| Answer» D. Maximum safe yield of an open well, is expected at critical depression head | |
| 145. |
The process of passing water through beds of granular materials, is called |
| A. | Screening |
| B. | Sedimentation |
| C. | Filtration |
| D. | None of these |
| Answer» C. Filtration | |
| 146. |
For the prediction of future population of a city, the factor to be considered, is |
| A. | Births |
| B. | Deaths |
| C. | Migrants |
| D. | All the above |
| Answer» D. All the above | |
| 147. |
Mathamoglobinemia or blue baby disease is caused due to |
| A. | Chlorides |
| B. | Nitrites |
| C. | Nitrates |
| D. | Sulphides |
| Answer» C. Nitrates | |
| 148. |
To control the growth of algae in reservoirs, the compound which is used, is |
| A. | Bleaching powder |
| B. | Copper sulphate |
| C. | Lime solution |
| D. | Alum solution |
| Answer» B. Copper sulphate | |
| 149. |
A pressure conduit laid underground, may not be subjected to |
| A. | Internal pressure of water |
| B. | Pressure due to external load |
| C. | Longitudinal temperature stress |
| D. | Longitudinal stresses due to unbalanced pressure to bends |
| Answer» C. Longitudinal temperature stress | |
| 150. |
The bacterias which require free oxygen for their survival, are called |
| A. | Aerobic bacterias |
| B. | Anaerobic bacterias |
| C. | Facultative bacteria |
| D. | None of these |
| Answer» A. Aerobic bacterias | |
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