MCQOPTIONS
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MCQOPTIONS
This section includes 167 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 settling velocity of a particle in a sedimentation tank increases if$? |
| A. | Particle size is decreased |
| B. | The surface area of tank is increased |
| C. | The depth of tank is decreased |
| D. | None of the above |
| Answer» E. | |
| 102. |
The design discharge for the separate sewer system shall be taken as$? |
| A. | Equal to dry weather flow (DWF) |
| B. | 2 √ó DWF |
| C. | 3 √ó DWF |
| D. | 6 √ó DWF |
| Answer» E. | |
| 103. |
Which of the following unit works in anaerobic conditions?$? |
| A. | Sludge digestion tank |
| B. | Sedimentation tank |
| C. | Activated sludge treatment |
| D. | Trickling filters |
| Answer» B. Sedimentation tank | |
| 104. |
The type of valve, which is provided on the suction pipe in a tube-well, is$? |
| A. | Air relief valve |
| B. | Reflux valve |
| C. | Pressure relief valve |
| D. | Sluice valve |
| Answer» C. Pressure relief valve | |
| 105. |
Scour valves are provided$? |
| A. | At street corners to control the flow of water |
| B. | At every depression and dead ends to drain out the waste water that may collect there |
| C. | At the foot of rising main along the slope to prevent back running of water |
| D. | At every summit of rising mains |
| Answer» C. At the foot of rising main along the slope to prevent back running of water | |
| 106. |
The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is$? |
| A. | 1 |
| B. | 100 |
| C. | Infinite |
| D. | Zero |
| Answer» C. Infinite | |
| 107. |
Average rate of water consumption per head per day as per Indian Standard is$? |
| A. | 100 liters |
| B. | 135 liters |
| C. | 165 liters |
| D. | 200 liters |
| Answer» C. 165 liters | |
| 108. |
The treatment of water with bleaching powder is known as$? |
| A. | Pre-chlorination |
| B. | Super chlorination |
| C. | De-chlorination |
| D. | Hypo-chlorination |
| Answer» E. | |
| 109. |
The overflow rate for plain sedimentation tanks is about$? |
| A. | 500 to 750 liters/hour/ m² |
| B. | 1000 to 1250 liters/hour/ m² |
| C. | 1250 to 1500 liters/hour/m² |
| D. | 1500 to 2000 liters/hour/m² |
| Answer» B. 1000 to 1250 liters/hour/ m¬¨‚⧠| |
| 110. |
Alum as a coagulant is found to be most effective when pH range of water is$? |
| A. | 2 to 4 |
| B. | 4 to 6 |
| C. | 6 to 8 |
| D. | 8 to 10 |
| Answer» D. 8 to 10 | |
| 111. |
The type of valve which is provided to control the flow of water in the distribution system at street corners and where the pipe lines intersect is |
| A. | Check valve |
| B. | Sluice valve |
| C. | Safety valve |
| D. | Scour valve |
| Answer» C. Safety valve | |
| 112. |
The specific gravity of sewage is |
| A. | Much greater than 1 |
| B. | Slightly less than 1 |
| C. | Equal to 1 |
| D. | Slightly greater than 1 |
| Answer» E. | |
| 113. |
Period of cleaning of slow sand filters is about |
| A. | 24 - 48 hours |
| B. | 10 - 12 days |
| C. | 2 - 3 months |
| D. | 1 - 2 year |
| Answer» D. 1 - 2 year | |
| 114. |
The distribution mains are designed for |
| A. | Maximum daily demand |
| B. | Maximum hourly demand |
| C. | Average daily demand |
| D. | Maximum hourly demand on maximum day |
| Answer» E. | |
| 115. |
Generally the detention period for grit chambers is kept as |
| A. | 1 minute |
| B. | 5 minutes |
| C. | 24 hours |
| D. | 12 hours |
| Answer» B. 5 minutes | |
| 116. |
Which of the following retards the self purification of stream? |
| A. | Higher temperature |
| B. | Sunlight |
| C. | Satisfying oxygen demand |
| D. | None of the above |
| Answer» E. | |
| 117. |
As compared to shallow wells, deep wells have |
| A. | More depth |
| B. | Less depth |
| C. | More discharge |
| D. | Less discharge |
| Answer» D. Less discharge | |
| 118. |
The maximum efficiency of BOD removal is achieved in |
| A. | Oxidation pond |
| B. | Oxidation ditch |
| C. | Aerated lagoons |
| D. | Trickling filters |
| Answer» C. Aerated lagoons | |
| 119. |
The characteristics of fresh and septic sewage respectively are |
| A. | Acidic and alkaline |
| B. | Alkaline and acidic |
| C. | Both acidic |
| D. | Both alkaline |
| Answer» C. Both acidic | |
| 120. |
The hourly variation factor is usually taken as |
| A. | 1.5 |
| B. | 1.8 |
| C. | 2.0 |
| D. | 2.7 |
| Answer» B. 1.8 | |
| 121. |
The maximum permissible limit for fluoride in drinking water is |
| A. | 0.1 mg/liter |
| B. | 1.5 mg/liter |
| C. | 5 mg/liter |
| D. | 10 mg/liter |
| Answer» C. 5 mg/liter | |
| 122. |
The most common cause of acidity in water is |
| A. | Carbon dioxide |
| B. | Oxygen |
| C. | Hydrogen |
| D. | Nitrogen |
| Answer» B. Oxygen | |
| 123. |
The percentage of chlorine in fresh bleaching powder is about |
| A. | 10 to 15 |
| B. | 20 to 25 |
| C. | 30 to 35 |
| D. | 40 to 50 |
| Answer» D. 40 to 50 | |
| 124. |
The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is |
| A. | Reflux valve |
| B. | Sluice valve |
| C. | Air relief valve |
| D. | Pressure relief valve |
| Answer» B. Sluice valve | |
| 125. |
The rate of BOD exerted at any time is |
| A. | Directly proportional to BOD satisfied |
| B. | Directly proportional to BOD remaining |
| C. | Inversely proportional to BOD satisfied |
| D. | Inversely proportional to BOD remaining |
| Answer» C. Inversely proportional to BOD satisfied | |
| 126. |
Residual chlorine in water is determined by |
| A. | Starch iodide method |
| B. | Orthotolidine method |
| C. | Both (A) and (B) |
| D. | None of the above |
| Answer» D. None of the above | |
| 127. |
The velocity of flow of water in a sedimentation tank is about |
| A. | 5 to 10 cm/sec |
| B. | 15 to 30 cm/sec |
| C. | 15 to 30 cm/minute |
| D. | 15 to 30 cm/hour |
| Answer» D. 15 to 30 cm/hour | |
| 128. |
On standard silica scale, the turbidity in drinking water should be limited to |
| A. | 10 ppm |
| B. | 20 ppm |
| C. | 30 ppm |
| D. | 50 ppm |
| Answer» B. 20 ppm | |
| 129. |
The hydraulic mean depth (HMD) for an egg-shaped sewer flowing two-third full is |
| A. | Equal to HMD when flowing full |
| B. | Less than HMD when flowing full |
| C. | Greater than HMD when flowing full |
| D. | None of the above |
| Answer» D. None of the above | |
| 130. |
Which of the following sewers is preferred for combined system of sewage? |
| A. | Circular sewer |
| B. | Egg shaped sewer |
| C. | Rectangular sewer |
| D. | None of the above |
| Answer» C. Rectangular sewer | |
| 131. |
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 | |
| 132. |
Alkalinity in water is expressed as milligrams per litre in terms of equivalent |
| A. | Calcium carbonate |
| B. | Magnesium carbonate |
| C. | Sodium carbonate |
| D. | Calcium hydroxide |
| Answer» B. Magnesium carbonate | |
| 133. |
The ratio of 5 day BOD to ultimate BOD is about |
| A. | 1/3 |
| B. | 2/3 |
| C. | 3/4 |
| D. | 1.0 |
| Answer» C. 3/4 | |
| 134. |
In lime-soda process |
| A. | Only carbonate hardness is removed |
| B. | Only noncarbonated hardness is removed |
| C. | Lime reduces the carbonate hardness and soda-ash removes the non-carbonate hardness |
| D. | Lime reduces the non-carbonate hardness and soda-ash removes the carbonate hardness |
| Answer» D. Lime reduces the non-carbonate hardness and soda-ash removes the carbonate hardness | |
| 135. |
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 | |
| 136. |
The suitable method of forecasting population for a young and rapidly increasing city is |
| A. | Arithmetical increase method |
| B. | Geometrical increase method |
| C. | Incremental increase method |
| D. | Graphical method |
| Answer» C. Incremental increase method | |
| 137. |
The devices which are installed for drawing water from the sources are called |
| A. | Aquifers |
| B. | Aquiclude |
| C. | Filters |
| D. | Intakes |
| Answer» E. | |
| 138. |
The slope of sewer shall be |
| A. | Given in the direction of natural slope of ground |
| B. | Given in the direction opposite to natural slope of ground |
| C. | Zero |
| D. | Steeper than 1 in 20 |
| Answer» B. Given in the direction opposite to natural slope of ground | |
| 139. |
The process in which the chlorination is done beyond the break point is known as |
| A. | Pre-chlorination |
| B. | Post chlorination |
| C. | Super chlorination |
| D. | Break point chlorination |
| Answer» D. Break point chlorination | |
| 140. |
Which of the following chemical compounds can be used for de-chlorination of water? |
| A. | Carbon dioxide |
| B. | Bleaching powder |
| C. | Sulphur dioxide |
| D. | Chloramines |
| Answer» D. Chloramines | |
| 141. |
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. | 1,00,000 |
| D. | 4,00,000 |
| Answer» E. | |
| 142. |
Orthotolidine test is used for determination of |
| A. | Dissolved oxygen |
| B. | Residual chlorine |
| C. | Biochemical oxygen demand |
| D. | Dose of coagulant |
| Answer» C. Biochemical oxygen demand | |
| 143. |
Which of the following values of pH represents a stronger acid? |
| A. | 2 |
| B. | 5 |
| C. | 7 |
| D. | 10 |
| Answer» B. 5 | |
| 144. |
Sewage treatment units are normally designed for |
| A. | 5 - 10 years |
| B. | 15 - 20 years |
| C. | 30 - 40 years |
| D. | 40 - 50 years |
| Answer» C. 30 - 40 years | |
| 145. |
The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about |
| A. | 0.01 to 0.05 ppm |
| B. | 0.05 to 0.5 ppm |
| C. | 0.5 to 1.0 ppm |
| D. | 1.0 to 5.0 ppm |
| Answer» C. 0.5 to 1.0 ppm | |
| 146. |
The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by |
| A. | TOD > BOD > COD |
| B. | TOD > COD > BOD |
| C. | BOD > COD > TOD |
| D. | COD > BOD > TOD |
| Answer» C. BOD > COD > TOD | |
| 147. |
The gas from sludge digestion tank is mainly composed of |
| A. | Nitrogen |
| B. | Carbon dioxide |
| C. | Hydrogen sulphide |
| D. | Methane |
| Answer» E. | |
| 148. |
In chlorination, with the rise in temperature of water, death rate of bacteria |
| A. | Increases |
| B. | Decreases |
| C. | Remains unaffected |
| D. | None of the above |
| Answer» B. Decreases | |
| 149. |
Standard EDTA (ethylene diamine tetra acetic acid) solution is used to determine the |
| A. | Hardness in water |
| B. | Turbidity in water |
| C. | Dissolved oxygen in water |
| D. | Residual chlorine in water |
| Answer» B. Turbidity in water | |
| 150. |
Sludge volume index is defined as the ratio of |
| A. | Percentage of sludge by volume to percentage of suspended solids by weight |
| B. | Percentage of sludge by volume to percentage of total solids by weight |
| C. | Percentage of suspended solids by weight to percentage of sludge by volume |
| D. | Percentage of total solids by weight to percentage of sludge by volume |
| Answer» B. Percentage of sludge by volume to percentage of total solids by weight | |