MCQOPTIONS
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MCQOPTIONS
This section includes 344 Mcqs, each offering curated multiple-choice questions to sharpen your Surveying knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
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. | |
| 102. |
The sewage treatment in septic tanks is due to |
| A. | Anaerobic decomposition |
| B. | Aerobic decomposition |
| C. | Parasitic decomposition |
| D. | None of these |
| Answer» B. Aerobic decomposition | |
| 103. |
The drainage area of a town is 12 hectares. Its 40% area is hard pavement ( K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula Ps = 900/(t + 60) the maximum run off is |
| A. | 0.10 cumec |
| B. | 0.12 cumec |
| C. | 0.15 cumec |
| D. | 0.20 cumec |
| Answer» D. 0.20 cumec | |
| 104. |
The temperature affects the |
| A. | Biological activity of bacteria in sewage |
| B. | Solubility of gases in sewage |
| C. | Viscosity of sewage |
| D. | All the above |
| Answer» E. | |
| 105. |
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» B. Liberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates | |
| 106. |
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% | |
| 107. |
hydraulically equivalent, the relationship which holds good, is |
| A. | D8/3 = 4 b8/3 |
| B. | D3/8 = 4 b3/8 |
| C. | D2/3 = 4 b2/3 |
| D. | D3/2 = 4 b3/2 |
| Answer» B. D3/8 = 4 b3/8 | |
| 108. |
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» D. D’ = 0.94 D | |
| 109. |
The asbestos cement sewers are |
| A. | Light in weight |
| B. | Not structurally strong to bear large compressive stress |
| C. | Susceptible to corrosion by sulphuric acid |
| D. | All the above |
| Answer» E. | |
| 110. |
The first stage of neutral process of sludge digestion, is |
| A. | Acid fermentation |
| B. | Acid regression |
| C. | Alkaline fermentation |
| D. | None of these |
| Answer» B. Acid regression | |
| 111. |
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 | |
| 112. |
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» C. 1.25 m/sec | |
| 113. |
The drop man holes are generally provided in sewers for |
| A. | Industrial areas |
| B. | Large town ships |
| C. | Hilly town ships |
| D. | Cities in plains |
| Answer» D. Cities in plains | |
| 114. |
The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is |
| A. | 5 m |
| B. | 5.5 m |
| C. | 6.5 m |
| D. | 7 m |
| Answer» E. | |
| 115. |
A nuisance is experienced in diluting water if dilution factor is less than |
| A. | 100 |
| B. | 60 |
| C. | 40 |
| D. | 20 |
| Answer» E. | |
| 116. |
Facultative bacteria survive in |
| A. | The presence of oxygen |
| B. | The absence of oxygen |
| C. | Both cases A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 117. |
The suitable cross-section of sewers to carry combined flow, is |
| A. | Circular |
| B. | Egg shaped |
| C. | Rectangular |
| D. | Horse shoe shaped |
| Answer» C. Rectangular | |
| 118. |
Discrete or granular particles change their |
| A. | Size |
| B. | Shape |
| C. | Weight |
| D. | None of these |
| Answer» E. | |
| 119. |
For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed |
| A. | 1.5 |
| B. | 2.0 |
| C. | 2.5 |
| D. | 3.0 |
| Answer» B. 2.0 | |
| 120. |
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 | |
| 121. |
The use of coarse screens for the disposal of sewage, may be dispensed with by |
| A. | Comminutor |
| B. | Shredder |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 122. |
For a continuous flow type of sedimentation tanks |
| A. | Width of the tank is normally kept about 6 m |
| B. | Length of the tank is normally kept 4 to 5 times the width |
| C. | Maximum horizontal flow velocity is limited to 0.3 m/minute |
| D. | All the above |
| Answer» E. | |
| 123. |
The sewer pipe which carries sewage from a building for immediate disposal is |
| A. | House sewer |
| B. | Lateral sewer |
| C. | Intercepting sewer |
| D. | Main sewer |
| Answer» B. Lateral sewer | |
| 124. |
Hume steel pipes are |
| A. | Steel pipes |
| B. | Steel shell coated from inside with cement mortar |
| C. | Steel shell coated from outside with cement mortar |
| D. | Both B and C |
| Answer» E. | |
| 125. |
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 | |
| 126. |
For sewer mains of 0.5 to 1 m diameter, the ratio of maximum daily sewage flow to the average daily sewage flow is assumed |
| A. | 1.5 |
| B. | 2.0 |
| C. | 2.5 |
| D. | 3.0 |
| Answer» C. 2.5 | |
| 127. |
The rational formula for peak drainage discharge, was evolved by |
| A. | Fruhling |
| B. | Lloyd David |
| C. | Kuichling |
| D. | All of these |
| Answer» E. | |
| 128. |
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 | |
| 129. |
Large diameter sewers subjected to external pressure alone, are reinforced |
| A. | Near the inner surface of the pipe |
| B. | Near the outer surface of the pipe |
| C. | Both A and B |
| D. | With elliptical cage |
| Answer» E. | |
| 130. |
Lead caulked joints are used for laying |
| A. | Stone ware pipes |
| B. | Earthenware pipes |
| C. | C.I. pipes |
| D. | G.I. pipes |
| Answer» C. C.I. pipes | |
| 131. |
The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is |
| A. | 1.5 |
| B. | 2.0 |
| C. | 3.0 |
| D. | 4.0 |
| Answer» B. 2.0 | |
| 132. |
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» D. 0.9 to 1.20 m | |
| 133. |
If the grit in grit chambers is 4.5 million litres per day, its cleaning is done |
| A. | Manually |
| B. | Mechanically |
| C. | Hydraulically |
| D. | Electrically |
| Answer» B. Mechanically | |
| 134. |
The clarigesters are |
| A. | Circular septic tanks |
| B. | Rectangular septic tanks |
| C. | Circular Imhoff double tanks with bottom hoppers |
| D. | Circular Imhoff double storey tanks without bottom hoppers |
| Answer» E. | |
| 135. |
The rainfall at any place may be determined by |
| A. | Its intensity |
| B. | Its direction |
| C. | Its frequency |
| D. | All the above |
| Answer» E. | |
| 136. |
For trunk and out-fall, the type of sewers generally used, is |
| A. | Standard egg shaped |
| B. | Circular shaped |
| C. | Horse shoe shaped |
| D. | Parabolic shaped |
| Answer» D. Parabolic shaped | |
| 137. |
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 | |
| 138. |
With self cleansing velocity in sewers |
| A. | Silting occurs at bottom |
| B. | Scouring occurs at bottom |
| C. | Both silting and scouring occur at bottom |
| D. | Neither silting nor scouring occurs at bottom |
| Answer» E. | |
| 139. |
In the activated sludge process |
| A. | Aeration is continued till stability |
| B. | Aeration is done with an admixture of previously aerated sludge |
| C. | Sludge is activated by constant stirring |
| D. | Water is removed by centrifugal action |
| Answer» C. Sludge is activated by constant stirring | |
| 140. |
Sewer pipes need be checked for |
| A. | Minimum flow |
| B. | Maximum flow |
| C. | Both A and B |
| D. | None of these |
| Answer» D. None of these | |
| 141. |
If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains |
| A. | Hydrogen sulphide |
| B. | Carbon dioxide |
| C. | Methane |
| D. | Oxygen |
| Answer» D. Oxygen | |
| 142. |
The following is the physical characteristic of sewage |
| A. | Turbidity |
| B. | Colour |
| C. | Odour |
| D. | All the above |
| Answer» E. | |
| 143. |
Before discharging the foul sewage into rivers, it is generally treated by |
| A. | Screening |
| B. | Sedimentation |
| C. | Oxidation |
| D. | All the above |
| Answer» E. | |
| 144. |
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» E. | |
| 145. |
The spacing of bars of perforations of fine screens used for the treatment of sewage, is |
| A. | 2 to 3 mm |
| B. | 3 to 5 mm |
| C. | 5 to 8 mm |
| D. | 8 to 10 mm |
| Answer» B. 3 to 5 mm | |
| 146. |
A cylindrical ejector having its height 2 m fills after every 10 minutes with a peak sewage discharge of 0.0157 cumec. The diameter of the ejector chamber, is |
| A. | 2.30 m |
| B. | 2.40 m |
| C. | 2.45 m |
| D. | 2.50 m |
| Answer» D. 2.50 m | |
| 147. |
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. | |
| 148. |
The sewer that unloads the sewage at the point of treatment is called |
| A. | Main sewer |
| B. | Outfall sewer |
| C. | Branch sewer |
| D. | House sewer |
| Answer» C. Branch sewer | |
| 149. |
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» E. | |
| 150. |
Inter-distance between ventilation columns in a sewer line is kept |
| A. | 25 to 50 m |
| B. | 50 m to 100 m |
| C. | 100 m to 150 m |
| D. | 150 m to 300 m |
| Answer» E. | |