MCQOPTIONS
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MCQOPTIONS
This section includes 238 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. |
If the sewage contains grease and fatty oils, these are removed in_________________? |
| A. | grit chambers |
| B. | detritus tanks |
| C. | skimming tanks |
| D. | sedimentation tanks |
| Answer» D. sedimentation tanks | |
| 102. |
If the coliform bacteria is present in a sample of water, then the coliform test to be conducted is_____________?_x005F_x000D_1) presumptive coliform test_x005F_x000D_2) confirmed coliform test_x005F_x000D_3) completed coliform test_x005F_x000D_The correct answer is ? |
| A. | only (1) |
| B. | both (1) and (2) |
| C. | both (1) and (3) |
| D. | all (1), (2) and (3) |
| Answer» E. | |
| 103. |
If the average daily consumption of a city is 100,000 m3, the maximum daily con¬sumption on peak hourly demand will be_______________? |
| A. | 100000m3 |
| B. | 150000m3 |
| C. | 180000m3 |
| D. | 270000 m3 |
| Answer» E. | |
| 104. |
If Biochemical oxygen demand (BOD. of a town is 20000 kg/day and BOD per capita per day is 0.05 kg, then population equivalent of town is_________________? |
| A. | 1000 |
| B. | 4000 |
| C. | 100000 |
| D. | 400000 |
| Answer» E. | |
| 105. |
Hardy cross method of analysis of distribution system________________?_x005F_x000D_1) involves successive trials_x005F_x000D_2) takes economic aspects into account_x005F_x000D_3) is time consuming_x005F_x000D_The correct answer is? |
| A. | only (1) |
| B. | (1)and(2) |
| C. | (1) and (3) |
| D. | all are correct |
| Answer» D. all are correct | |
| 106. |
Ground water is usually free from________________? |
| A. | suspended impurities |
| B. | dissolved impurities |
| C. | both suspended and dissolved impuri¬ties |
| D. | none of the above |
| Answer» B. dissolved impurities | |
| 107. |
Generally the detention period for grit chambers is kept as_______________? |
| A. | 1 minute |
| B. | 5 minutes |
| C. | 2-4 hours |
| D. | 12 hours |
| Answer» B. 5 minutes | |
| 108. |
For the same solid content, if the quantity of sludge with moisture content of 98% is X, then the quantity of sludge with moisture content of 96% will be__________________? |
| A. | X/4 |
| B. | X/2 |
| C. | X |
| D. | 2X |
| Answer» C. X | |
| 109. |
For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as___________________? |
| A. | 4.5 to 6.0 |
| B. | 6.5 to 8.0 |
| C. | 8.5 to 10.0 |
| D. | 10.5 to 12.0 |
| Answer» C. 8.5 to 10.0 | |
| 110. |
For normal sludge, the value of sludge index for Indian conditions is________________? |
| A. | 0 to 50 |
| B. | 50 to 150 |
| C. | 150 to 350 |
| D. | 350 to 500 |
| Answer» D. 350 to 500 | |
| 111. |
For a given discharge, the efficiency of sedimentation tank can be increased by______________? |
| A. | increasing the depth of tank |
| B. | decreasing the depth of tank |
| C. | increasing the surface area of tank |
| D. | decreasing the surface area of tank |
| Answer» D. decreasing the surface area of tank | |
| 112. |
For a country like India, where rainfall is mainly confined to one season, the suitable sewerage system will be________________? |
| A. | separate system |
| B. | combined system |
| C. | partially combined system |
| D. | partially separate system |
| Answer» B. combined system | |
| 113. |
Facultative bacteria are able to work in________________? |
| A. | presence of oxygen only |
| B. | absence of oxygen only |
| C. | presence as well as in absence of oxygen |
| D. | presence of water |
| Answer» D. presence of water | |
| 114. |
Double filtration is used_______________? |
| A. | to increase the filtration slow sand filters capacity of |
| B. | to increase the filtration rapid sand filters capacity of |
| C. | for isolated buildings like pools, hotels etc swimming |
| D. | all of the above |
| Answer» B. to increase the filtration rapid sand filters capacity of | |
| 115. |
Dissolved oxygen in streams is______________? |
| A. | maximum at noon |
| B. | minimum at noon |
| C. | maximum at midnight |
| D. | same throughout the day |
| Answer» B. minimum at noon | |
| 116. |
Disinfection of water results in______________? |
| A. | removal of turbidity |
| B. | removal of hardness |
| C. | killing of disease bacteria |
| D. | complete sterilisation |
| Answer» D. complete sterilisation | |
| 117. |
Disinfection efficiency is________________? |
| A. | reduced at higher pH value of water |
| B. | unaffected by pH value of water |
| C. | increased at higher pH value of water |
| D. | highest at pH value equal to 7 |
| Answer» B. unaffected by pH value of water | |
| 118. |
Corrosion in concrete sewers is caused by______________? |
| A. | septic conditions |
| B. | dissolved oxygen |
| C. | chlorine |
| D. | nitrogen |
| Answer» B. dissolved oxygen | |
| 119. |
Composting and lagooning are the methods of_______________? |
| A. | sludge digestion |
| B. | sludge disposal |
| C. | sedimentation |
| D. | filtration |
| Answer» C. sedimentation | |
| 120. |
Cleaning is done by________________?_x005F_x000D_1) scraping and removal in filters slow sand_x005F_x000D_2) back washing in slow sand filters_x005F_x000D_3) scraping and removal in filters rapid sand_x005F_x000D_4) back washing in rapid sand filters_x005F_x000D_The correct answer is |
| A. | (1) and (2) |
| B. | (2) and (3) |
| C. | (1) and (4) |
| D. | (2) and (4) |
| Answer» D. (2) and (4) | |
| 121. |
Chlorine demand of water is equal to________________? |
| A. | applied chlorine |
| B. | residual chlorine |
| C. | sum of applied and residual chlorine |
| D. | difference of applied and residual chlorine |
| Answer» E. | |
| 122. |
Average rate of water consumption perhead per day as per Indian Standard is______________? |
| A. | 100 litres |
| B. | 135 litres |
| C. | 165 litres |
| D. | 200 litres |
| Answer» C. 165 litres | |
| 123. |
Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters. Reason R : The sand used in slow sand filters is finer than that in rapid sand filters. Select your answer based on the coding system given below? |
| A. | Both A and R are true and R is the correct explanation of A |
| B. | Both A and R are true but R is not the correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» B. Both A and R are true but R is not the correct explanation of A | |
| 124. |
Assertion A : The consumption of water increases with increase in the distribution pressure. Reason R : Higher distribution pressure causes more loss and waste of water. Select your answer according to the coding system given below? |
| A. | Both A and R are true and R is the correct explanation of A |
| B. | Both A and R are true but R is not the correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» B. Both A and R are true but R is not the correct explanation of A | |
| 125. |
As compared to rapid sand filters, slow sand filters give______________?_x005F_x000D_1) slower filtration rate_x005F_x000D_2) higher filtration rate_x005F_x000D_3) lesser efficiency in removal of bacteria_x005F_x000D_4) higher efficiency in removal of bacteria_x005F_x000D_The correct answer is? |
| A. | (1) and (2) |
| B. | (2) and (3) |
| C. | (1) and (4) |
| D. | (2) and (4) |
| Answer» D. (2) and (4) | |
| 126. |
As compared to shallow-wells, deep wells have______________? |
| A. | more depth |
| B. | less depth |
| C. | more discharge |
| D. | less discharge |
| Answer» D. less discharge | |
| 127. |
As compared to higher pH values, the contact period required for efficient chlorination at lower pH values is___________________? |
| A. | smaller |
| B. | larger |
| C. | same |
| D. | none of the above |
| Answer» B. larger | |
| 128. |
As compared to geometrical increase method of forecasting population, arithmetical increase method gives________________? |
| A. | lesser value |
| B. | higher value |
| C. | same value |
| D. | accurate value |
| Answer» B. higher value | |
| 129. |
As compared to cast iron pipes, steel pipes are______________? |
| A. | heavier |
| B. | stronger |
| C. | costlier |
| D. | less susceptible to corrosion |
| Answer» C. costlier | |
| 130. |
An egg shaped section of sewer________________? |
| A. | is economical than circular section |
| B. | provides self cleansing velocity at low discharges |
| C. | is more stable than circular section |
| D. | is easy to construct |
| Answer» C. is more stable than circular section | |
| 131. |
Alum as a coagulant is found to be most effective when pH range of water is______________? |
| A. | 2 to 4 |
| B. | 4 to 6 |
| C. | 6 to 8 |
| D. | 8 to 10 |
| Answer» D. 8 to 10 | |
| 132. |
Alkalinity in water is expressed as milli-grams per litre in terms of equivalent_______________? |
| A. | calcium carbonate |
| B. | magnesium carbonate |
| C. | sodium carbonate |
| D. | calcium hydroxide |
| Answer» B. magnesium carbonate | |
| 133. |
Air binding phenomena in rapid sand filters occur due to_________________? |
| A. | excessive negative head |
| B. | mud ball formation |
| C. | higher turbidity in the effluent |
| D. | low temperature |
| Answer» B. mud ball formation | |
| 134. |
Activated carbon is used for_____________? |
| A. | disinfection |
| B. | removing hardness |
| C. | removing odours |
| D. | removing corrosiveness |
| Answer» D. removing corrosiveness | |
| 135. |
A sewer that receives the discharge of a number of house sewers is called________________? |
| A. | house sewer |
| B. | lateral sewer |
| C. | intercepting sewer |
| D. | submain sewer |
| Answer» C. intercepting sewer | |
| 136. |
A pipe which is installed in the house drainage to preserve the water seal of traps is called______________? |
| A. | vent pipe |
| B. | antisiphonage pipe |
| C. | waste pipe |
| D. | soil pipe |
| Answer» C. waste pipe | |
| 137. |
A pipe conveying sewage from plumbing system of a single building to common sewer or point of immediate disposal is called________________? |
| A. | house sewer |
| B. | lateral sewer |
| C. | main sewer |
| D. | submain sewer |
| Answer» B. lateral sewer | |
| 138. |
Assertion A: The consumption of water increases with increase in the distribution pressure.Reason R: Higher distribution pressure causes more loss and waste of waterSelect your answer according to the coding system given below |
| A. | oth A and R is true and R is the correct explanation of A |
| B. | oth A and R is true but R is not the correct explanation of A |
| C. | is true but R is false |
| D. | is false but R is true |
| Answer» B. oth A and R is true but R is not the correct explanation of A | |
| 139. |
The suitable layout of a distribution system for irregularly growing town is |
| A. | ead end system |
| B. | rid iron system |
| C. | adial system |
| D. | ing system |
| Answer» B. rid iron system | |
| 140. |
The commonly used material for water supply pipes, which has the properties of being strong, not easily corroded and long life but is heavy and brittle, is |
| A. | teel |
| B. | ast iron |
| C. | opper |
| D. | einforced cement concrete |
| Answer» C. opper | |
| 141. |
Corrosion in concrete sewers is caused by |
| A. | eptic conditions |
| B. | issolved oxygen |
| C. | hlorine |
| D. | itrogen |
| Answer» B. issolved oxygen | |
| 142. |
Chlorine demand of water is equal to |
| A. | pplied chlorine |
| B. | esidual chlorine |
| C. | um of applied and residual chlorine |
| D. | ifference of applied and residual chlorine |
| Answer» E. | |
| 143. |
The effective size of sand particles used in slow sand filters is |
| A. | .25 to 0.35 mm |
| B. | .35 to 0.60 mm |
| C. | .60 to 1.00 mm |
| D. | .00 to 1.80 mm |
| Answer» B. .35 to 0.60 mm | |
| 144. |
The disinfection efficiency of chlorine increases by(i) Decreasing the time of contact(ii) Decreasing the temperature of water(iii) Increasing the temperature of water |
| A. | nly (i) |
| B. | oth (i) and (ii) |
| C. | oth (i) and (iii) |
| D. | nly (iii) |
| Answer» E. | |
| 145. |
As compared to higher pH values, the contact period required for efficient chlorination at lower pH values is |
| A. | maller |
| B. | arger |
| C. | ame |
| D. | one of the above |
| Answer» B. arger | |
| 146. |
The treatment of water with bleaching powder is known as |
| A. | re-chlorination |
| B. | uper chlorination |
| C. | e-chlorination |
| D. | ypo-chlorination |
| Answer» E. | |
| 147. |
Composting and lagooning are the methods of |
| A. | ludge digestion |
| B. | ludge disposal |
| C. | edimentation |
| D. | iltration |
| Answer» C. edimentation | |
| 148. |
Alum as a coagulant is found to be most effective when pH range of water is |
| A. | to 4 |
| B. | to 6 |
| C. | to 8 |
| D. | to 10 |
| Answer» D. to 10 | |
| 149. |
The pipe which is used to carry the discharge from sanitary fittings like bath rooms, kitchens etc. is called |
| A. | aste pipe |
| B. | oil pipe |
| C. | ent pipe |
| D. | nti-siphonage pipe |
| Answer» B. oil pipe | |
| 150. |
The suitable layout of distribution system for a city with roads of rectangular pattern is |
| A. | rid iron system |
| B. | ead end system |
| C. | ing system |
| D. | adial system |
| Answer» B. ead end system | |