McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 101. |
Grit chambers of a sewage plant are usually changed after |
| A. | 1 day |
| B. | 1 week |
| C. | 2 weeks |
| D. | 4 weeks |
| Answer» C. 2 weeks | |
| 102. |
Low turbidity of water can be determined by |
| A. | turbidity tube |
| B. | Jacksons turbidimeter |
| C. | Baylis turbidimeter |
| D. | Hellipe turbidimeter |
| Answer» C. Baylis turbidimeter | |
| 103. |
High turbidity of water can be determined by |
| A. | turbidity tube |
| B. | Jacksons turbidimeter |
| C. | Baylis turbidimeter |
| D. | Hellipe turbidimeter |
| Answer» B. Jacksons turbidimeter | |
| 104. |
The maximum permissible hardness in water for drinking purposes should not exceed 100 ppm. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 105. |
When the pH value of water is more than 7, it represents |
| A. | neutal |
| B. | acidic |
| C. | alkaline |
| Answer» C. alkaline | |
| 106. |
Copper sulphate is the most common chemical used for controlling |
| A. | bacteria |
| B. | algae |
| C. | silt |
| D. | mineral matter |
| Answer» B. algae | |
| 107. |
Flush type fire hydrants remain standing above the road. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 108. |
Rapid sand filter can remove turbidity from water upto an extent of |
| A. | 15 to 25 ppm |
| B. | 25 to 35 ppm |
| C. | 35 to 40 ppm |
| D. | 40 to 50 ppm |
| Answer» C. 35 to 40 ppm | |
| 109. |
Bio-chemical oxygen demand (B.O.D.) of safe drinking water must be |
| A. | 0 |
| B. | 10 |
| C. | 50 |
| D. | 100 |
| Answer» A. 0 | |
| 110. |
Sphere shaped bacterias are called |
| A. | spirilla |
| B. | bacilli |
| C. | cocci |
| D. | trichobacteria |
| Answer» C. cocci | |
| 111. |
A sewer which receives storm water, surface run-off and sewage is called a |
| A. | common sewer |
| B. | combined sewer |
| C. | branch sewer |
| D. | outfall sewer |
| Answer» B. combined sewer | |
| 112. |
The amount of oxygen consumed by sewage from an oxidising agent like potassium dichromate is termd as |
| A. | bio-chemical oxygen demand (B.O.D.) |
| B. | chemical oxygen demand (C.O.D.) |
| C. | relative stability |
| D. | none of these |
| Answer» B. chemical oxygen demand (C.O.D.) | |
| 113. |
A separate system will be favourable when |
| A. | the sewers are to be laid in rocks |
| B. | the finances are limited |
| C. | the topography is flat necessitating deep excavation for combined sewers |
| D. | all of the above |
| Answer» D. all of the above | |
| 114. |
The valve provided on the suction pipe in a tube well is |
| A. | sluice valve |
| B. | air relief valve |
| C. | pressure relief valve |
| D. | reflux valve |
| Answer» D. reflux valve | |
| 115. |
The equipment used for cleaning the sewers easily is called |
| A. | gouge |
| B. | scoop |
| C. | claw |
| D. | scraper |
| Answer» D. scraper | |
| 116. |
The water obtianed from |
| A. | infiltration galleries |
| B. | springs |
| C. | rivers |
| D. | wells |
| Answer» B. springs | |
| 117. |
Which of the following statement is correct? |
| A. | Screens are inclined to increase the opening area. |
| B. | Plain sdimentation is useful as a process preliminary to further treatments. |
| C. | Ratio of the volume of the basin of sedimentation tank to the rate of flow is called detention period |
| D. | all of the above |
| Answer» D. all of the above | |
| 118. |
According to Indian standards, the consumption of water per capita per day for nursing homes, boarding schools and hostels is |
| A. | 85 litres |
| B. | 100 litres |
| C. | 115 litres |
| D. | 135 litres |
| Answer» D. 135 litres | |
| 119. |
The equipment used for removing paper and rags from sewers is called |
| A. | gouge |
| B. | scoop |
| C. | claw |
| D. | scraper |
| Answer» C. claw | |
| 120. |
Run-off is the water which flows |
| A. | in infiltration galleries |
| B. | in sewer pipes |
| C. | due to leakage of pipes |
| D. | in rivers |
| Answer» D. in rivers | |
| 121. |
In preliminary treatment of sewage, the operation which takes place, is |
| A. | removal of fine suspended particles |
| B. | removal of fine dissolved organic material |
| C. | removal of lighter floating material |
| D. | removal of harmful bacterias and other organisms |
| Answer» C. removal of lighter floating material | |
| 122. |
The hydrants are used for tapping waer from mains for |
| A. | fire extinguishing |
| B. | street washing |
| C. | flushing sewer lines |
| D. | all of these |
| Answer» D. all of these | |
| 123. |
The presence of calcium and magnesium bi-carbonates in water causes hardness in the water. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 124. |
The acration of water is done to remove |
| A. | colour |
| B. | odour |
| C. | taste |
| D. | all of these |
| Answer» D. all of these | |
| 125. |
The time of contact for chlorination should be at least |
| A. | 5 minutes |
| B. | 20 minutes |
| C. | 1 hour |
| D. | 2 hours |
| Answer» B. 20 minutes | |
| 126. |
A sewer which receives discharge of a number of house sewers is called a |
| A. | common sewer |
| B. | trunk sewer |
| C. | lateral sewer |
| D. | branch sewer |
| Answer» C. lateral sewer | |
| 127. |
The artesian spring has too much hydraulic gradient and water flows out automatically. |
| A. | Right |
| B. | Wrong |
| Answer» A. Right | |
| 128. |
The slow sand filter should be cleaned if the loss of head becomes more than |
| A. | 0.75 m |
| B. | 1.2 m |
| C. | 2.2 m |
| D. | 3.5 m |
| Answer» B. 1.2 m | |
| 129. |
The self cleaning velocity, recommended for Indian conditions, in order to prevent settling down of seqage at the bottom or on the sides of a large sewer is |
| A. | 0.25 m/s |
| B. | 0.50 m/s |
| C. | 0.75 m/s |
| D. | 1.5 m/s |
| Answer» C. 0.75 m/s | |
| 130. |
The ground water is generally free from |
| A. | suspended |
| B. | dissolved |
| Answer» A. suspended | |
| 131. |
The amount of oxygen required for the biological decomposition of dissovled organic solids to occur under aerobic conditions is called bio-chemical oxygen demand (B.O.D.) |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 132. |
Sodium carbonate causes |
| A. | hardness |
| B. | softness |
| Answer» B. softness | |
| 133. |
The yield of the well is measured in |
| A. | cum / h |
| B. | litres / h |
| C. | either (a) or (b) |
| D. | none of these |
| Answer» C. either (a) or (b) | |
| 134. |
In the freshly produced sewage, aerobic activity is maximum. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 135. |
Turbidity is the measure of resistance to the passage of |
| A. | light |
| B. | air |
| Answer» A. light | |
| 136. |
The yield of the well dpends upon the |
| A. | permeability of the soil |
| B. | position of water table |
| C. | depth of well in impervious layer |
| D. | all of these |
| Answer» D. all of these | |
| 137. |
The layers such as sand and gravel which allow the water to pass through them are known as |
| A. | previous layers |
| B. | aquifers |
| C. | water bearing strata |
| D. | all of these |
| Answer» D. all of these | |
| 138. |
The presence of bacteria in water causes |
| A. | hardness |
| B. | alkalinity |
| C. | diseases |
| D. | bad taste |
| Answer» C. diseases | |
| 139. |
Which of the following statement is correct? |
| A. | If the pH value of water is equal to 7, the water is said to be neutral. |
| B. | The pH value determines the strength of the acid or slkali in water. |
| C. | The pH value of water can be obtained by a potentiometer |
| D. | all of the above |
| Answer» D. all of the above | |
| 140. |
Alkalinity is caused by positively charged hydrogen ions. |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 141. |
A drop manhole is provided if |
| A. | a sewer drops from a height |
| B. | a branch sewer discharges into the main sewer at a higher level |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» B. a branch sewer discharges into the main sewer at a higher level | |
| 142. |
A reflux valve, in water distribution system, is used to |
| A. | protect the pipe against negative pressure |
| B. | regulate the flow of water through the pipe |
| C. | prevent water to flow back in the opposite direction |
| D. | all of the above |
| Answer» C. prevent water to flow back in the opposite direction | |
| 143. |
For an area developed in haphazard way, the type of layout used for the distribution of pipes is known as |
| A. | dead end system |
| B. | ring system |
| C. | radial system |
| D. | grid iron system |
| Answer» A. dead end system | |
| 144. |
The apparatus used for feeding chlorine into water is called |
| A. | chlorine tank |
| B. | aeration fountain |
| C. | chlorinator |
| D. | none of these |
| Answer» C. chlorinator | |
| 145. |
For the sewers of diameter less than 600 mm, the type of joint preferred is |
| A. | spigot and socket joint |
| B. | collar joint |
| C. | bandage joint |
| D. | mechanical joint |
| Answer» A. spigot and socket joint | |
| 146. |
The layers such as lime stone and snd store which do not allow the water to pass through them are known as |
| A. | aquifers |
| B. | aquiclude |
| C. | aquifuge |
| D. | none of these |
| Answer» B. aquiclude | |
| 147. |
When lead is present in water, it |
| A. | changes its colour |
| B. | causes turbidity |
| C. | causes alkalinity |
| D. | none of these |
| Answer» D. none of these | |
| 148. |
For the sewers of diameter more than 600 mm, the type of joint preferred is |
| A. | spigot and socket joint |
| B. | collar joint |
| C. | bandage joint |
| D. | mechanical joint |
| Answer» B. collar joint | |
| 149. |
The odour of water does not change with the temperature. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 150. |
A sluice valve, in water distribution system, is used to |
| A. | protect the pipe against negative pressure |
| B. | regulate the flow of water through the pipe |
| C. | prevent water to flow back in the opposite direction |
| D. | all of tha above |
| Answer» B. regulate the flow of water through the pipe | |
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