MCQOPTIONS
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MCQOPTIONS
This section includes 260 Mcqs, each offering curated multiple-choice questions to sharpen your Civil Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
_ The maximum depth of sedimentation tanks, is kept$? |
| A. | 3 m |
| B. | 3.5 m |
| C. | 4 m |
| D. | 4.5 m |
| Answer» B. 3.5 m | |
| 102. |
_ At the junction of sewers$? |
| A. | Top of smaller sewer is kept lower |
| B. | Top of larger sewer is kept lower |
| C. | Tops of both the sewers are at the same level |
| D. | None of these |
| Answer» E. | |
| 103. |
_ A nuisance is experienced in diluting water if dilution factor is less than$? |
| A. | 100 |
| B. | 60 |
| C. | 40 |
| D. | 20 |
| Answer» E. | |
| 104. |
_ Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter$? |
| 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» E. | |
| 105. |
_ Drop manholes are the manholes$? |
| A. | Without entry ladders |
| B. | Without manhole covers |
| C. | With depths more than 3.5 m |
| D. | Having drains at different levels |
| Answer» E. | |
| 106. |
_ A circular sewer section is preferred to because$? |
| A. | It is cheaper in construction |
| B. | It provides maximum area for a given perimeter |
| C. | It provides maximum hydraulic mean depth |
| D. | All the above |
| Answer» E. | |
| 107. |
_ Antisyphonage pipe is fitted$? |
| A. | At the end of septic tanks |
| B. | On manholes |
| C. | With a W.'trap |
| D. | At the beginning of sewer line |
| Answer» D. At the beginning of sewer line | |
| 108. |
_ House connections to the laterals is generally made by$? |
| A. | R.C.C. |
| B. | P.C.C. |
| C. | Cast iron |
| D. | Glazed stonewares |
| Answer» E. | |
| 109. |
_ If is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is$? |
| A. | 1.15 D |
| B. | 1.25 D |
| C. | 1.5 D |
| D. | 1.75 D |
| Answer» D. 1.75 D | |
| 110. |
_ The factor responsible for purification of sewage in river is$? |
| A. | Hydrology |
| B. | Dissolved oxygen in water |
| C. | Temperature |
| D. | All the above |
| Answer» E. | |
| 111. |
_ The following is the physical characteristic of sewage$? |
| A. | Turbidity |
| B. | Colour |
| C. | Odour |
| D. | All the above |
| Answer» E. | |
| 112. |
_ In areas where rainy season is limited to a few months, the type of sewerage system recommended is$? |
| A. | Combined system |
| B. | Partially separate system |
| C. | Separate system |
| D. | None of these |
| Answer» D. None of these | |
| 113. |
_ Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for$? |
| A. | Unexpected large scale infiltration of stream water |
| B. | Unexpected increase in the population |
| C. | Under estimates of maximum and average flows |
| D. | All of the above |
| Answer» E. | |
| 114. |
_ The presence of free ammonia in sewage, is detected by$? |
| A. | Boiling |
| B. | Adding potassium permanganate |
| C. | Adding sulphuric acid |
| D. | Phenol-di-sulphuric acid |
| Answer» B. Adding potassium permanganate | |
| 115. |
_ The disintegrating pump in which solid matter is broken up before passing out, is$? |
| A. | Centrifugal pump |
| B. | Reciprocating pump |
| C. | Pneumatic ejector |
| D. | None of these |
| Answer» B. Reciprocating pump | |
| 116. |
_ In a residential colony, sewers of diameters 100 mm, 150 mm and 225 mm were laid with a gradient 1 in 120. Which portion of the sewage system does not choke in due course of time?$? |
| A. | 100 mm dia |
| B. | 150 mm dia |
| C. | 225 mm dia |
| D. | All of these |
| Answer» D. All of these | |
| 117. |
_ In normal conditions, the period for sludge digestion, is$? |
| A. | 10 days |
| B. | 20 days |
| C. | 30 days |
| D. | 60 days |
| Answer» D. 60 days | |
| 118. |
_ An inverted siphon is designed generally for$? |
| A. | One pipe |
| B. | Two pipes |
| C. | Three pipes |
| D. | Four pipes |
| Answer» D. Four pipes | |
| 119. |
_ Self-cleansing velocity is$? |
| A. | Velocity at dry weather flow |
| B. | Velocity of water at flushing |
| C. | Velocity at which no accumulation remains in the drains |
| D. | Velocity of water in a pressure filter |
| Answer» D. Velocity of water in a pressure filter | |
| 120. |
_ To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of$? |
| A. | Hydrochloric acid |
| B. | Sulphuric acid |
| C. | Nitric acid |
| D. | Citric acid |
| Answer» C. Nitric acid | |
| 121. |
_ In a grit chamber of a sewage treatment plant,$? |
| A. | Flow velocity 0.15 m to 0.3 m/sec is kept |
| B. | Depth of 0.9 m to 1.20 m is kept |
| C. | One minute of detention period is kept |
| D. | All the above |
| Answer» E. | |
| 122. |
_ Oxidation process results in the formation of$? |
| A. | Carbon dioxide |
| B. | Nitrates |
| C. | Sulphates |
| D. | All the above |
| Answer» E. | |
| 123. |
_ Dry weather flow is:$? |
| A. | Average daily rate of flow |
| B. | Average monthly rate of flow |
| C. | Average annual rate of flow |
| D. | Water supply allowance per capita |
| Answer» E. | |
| 124. |
_ The discharge per unit plan area of a sedimentation tank, is generally called$? |
| A. | Over flow rate |
| B. | Surface loading |
| C. | Over flow velocity |
| D. | All the above |
| Answer» E. | |
| 125. |
_ In R.C. sewer pipes, the percentage longitudinal reinforcement to the cross-sectional area of concrete is kept$? |
| A. | 10.0 |
| B. | 5.0 |
| C. | 2.0 |
| D. | 0.25 |
| Answer» E. | |
| 126. |
_ For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is$? |
| A. | Cast iron sewers |
| B. | Cement concrete sewers |
| C. | Glazed bricks sewers |
| D. | Stone ware sewers |
| Answer» D. Stone ware sewers | |
| 127. |
_ If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is$? |
| A. | 200 ppm |
| B. | 225 ppm |
| C. | 250 ppm |
| D. | None of these |
| Answer» D. None of these | |
| 128. |
_ The layers of vegetable wastes and night soil alternatively piled above the ground to form a mound, is called$? |
| A. | A heap |
| B. | Plateau |
| C. | Windrow |
| D. | None of these |
| Answer» E. | |
| 129. |
_ For design of sewers, percentage of sewage discharge is assumed$? |
| A. | 65 to 70% |
| B. | 70 to 75% |
| C. | 75 to 80% |
| D. | 85% |
| Answer» D. 85% | |
| 130. |
_ Which one of the following statements regarding septic tanks is wrong?$? |
| A. | A gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided |
| B. | The outlet invert level is kept 5 to 7.5 cm below the inlet invert level |
| C. | The minimum width of septic level is 90 cm |
| D. | The depth of tank is kept equal to its width |
| Answer» E. | |
| 131. |
_ Dried sewage after treatment is used as$? |
| A. | Fertilizer |
| B. | Building material |
| C. | Chemical for lowering B.O.D. |
| D. | Base material for paints |
| Answer» B. Building material | |
| 132. |
_ Aerobic bacterias$? |
| A. | Flourish in the presence of free oxygen |
| B. | Consume organic matter as their food |
| C. | Oxidise organic matter in sewage |
| D. | All the above |
| Answer» E. | |
| 133. |
_ The value of Chezy’s constant C = 157.6/(1.81 + K/ ) is used in$? |
| A. | Chezy’s formula |
| B. | Bazin’s formula |
| C. | Kutter’s formula |
| D. | Manning’s formula |
| Answer» C. Kutter‚Äö√Ñ√¥s formula | |
| 134. |
__The dimensions of a rectangular settling tank are: length 24 m, width 6 m and depth 3 m. If 2 hour detention period for tanks is recommended, the rate of flow of sewage per hour, is__ |
| A. | 204 cu.m |
| B. | 208 cu.m |
| C. | 212 cu.m |
| D. | 216 cu.m |
| Answer» E. | |
| 135. |
__For detecting the nitrates in sewage, the colour may be developed by adding__ |
| A. | Potassium permanganate |
| B. | Sulphuric acid and napthamine |
| C. | Phenol-di -sulphuric acid and potassium hydroxide |
| D. | None of these |
| Answer» D. None of these | |
| 136. |
__The grit and silt of the grit chambers, may not be used for__ |
| A. | Raising low lying areas by dumping |
| B. | Concreting |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» C. Both A and B | |
| 137. |
__For efficient working of a sewer, it must be ensured that__ |
| A. | Minimum velocity of 0.45 m/sec, is maintained at its minimum flow |
| B. | A maximum velocity of 0.90 m/sec, is maintained at its maximum flow |
| C. | Both (A) and (B) |
| D. | Neither (A) nor (B) |
| Answer» D. Neither (A) nor (B) | |
| 138. |
__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» C. Less than 7 | |
| 139. |
__The stone ware sewers__ |
| A. | Are used for carrying sewage and drainage from houses |
| B. | Are manufactured from clays and shale |
| C. | After casting are dried and burnt at temperature 150°C, 700°C and 1200°C |
| D. | All the above |
| Answer» E. | |
| 140. |
__Imhoff cone is used to measure__ |
| A. | Total organic solids |
| B. | Total solids |
| C. | Total in organic solids |
| D. | Settleable solids |
| Answer» E. | |
| 141. |
__The rate of accumulation of sludge per person per year, is__ |
| A. | 10 litres |
| B. | 15 litres |
| C. | 20 litres |
| D. | 25 litres |
| Answer» D. 25 litres | |
| 142. |
__The asbestos cement pipes are generally laid__ |
| A. | Horizontally |
| B. | Vertically |
| C. | At an angle of 30° |
| D. | At an angle of 60° |
| Answer» C. At an angle of 30¬¨‚àû | |
| 143. |
__As compared to fresh river water, sea water contains oxygen__ |
| A. | 10% less |
| B. | 20% less |
| C. | 10% more |
| D. | 20% more |
| Answer» C. 10% more | |
| 144. |
__In sewers the effect of scouring is more on__ |
| A. | Top side |
| B. | Bottom side |
| C. | Horizontal side |
| D. | All sides |
| Answer» C. Horizontal side | |
| 145. |
_The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is$? |
| A. | 1 in 100 upward |
| B. | 1 in 500 upward |
| C. | 1 in 100 downward |
| D. | 1 in 503 upward |
| Answer» D. 1 in 503 upward | |
| 146. |
_The normal values of over flow rates for sedimentation tanks using coagulant, ranges between$? |
| A. | 25,000 to 35,000 litres/sqm/day |
| B. | 40,000 to 50,000 litres/sqm/day |
| C. | 50,000 to 60,000 litres/sqm/day |
| D. | 80,000 to 100,000 litres/sqm/day |
| Answer» D. 80,000 to 100,000 litres/sqm/day | |
| 147. |
_In sewage having fully oxidised organic matter, the nitrogen exists in the form of$? |
| A. | Nitrites |
| B. | Nitrates |
| C. | Free ammonia |
| D. | Aluminoid nitrogen |
| Answer» C. Free ammonia | |
| 148. |
_Kjeldahl nitrogen is a mixture of$? |
| A. | Ammonia and nitrogen |
| B. | Nitrogen and organic nitrogen |
| C. | Organic nitrogen and ammonia |
| D. | All the above |
| Answer» E. | |
| 149. |
_The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is$? |
| A. | 1.095 |
| B. | 1.085 |
| C. | 1.075 |
| D. | 1.065 |
| Answer» B. 1.085 | |
| 150. |
_The digested sludge from septic tanks, is removed after a maximum period of$? |
| A. | 3 years |
| B. | 3.5 years |
| C. | 4 years |
| D. | 5 years |
| Answer» B. 3.5 years | |