MCQOPTIONS
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MCQOPTIONS
This section includes 180 Mcqs, each offering curated multiple-choice questions to sharpen your Environmental Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
The rate of filtration of a Micro-Strainer is __________ litres / hour. |
| A. | 10,000-20,000 |
| B. | 20,000-30,000 |
| C. | 40,000-60,000 |
| D. | 50,000-80,000 |
| Answer» E. | |
| 152. |
The slow sand filter is able to remove ______ % of bacteria in water. |
| A. | 90 |
| B. | 95 |
| C. | 98-99 |
| D. | 100 |
| Answer» D. 100 | |
| 153. |
In which action of filtration, removal of particulate matter takes place? |
| A. | Mechanical Straining |
| B. | Sedimentation |
| C. | Biological mechanism |
| D. | Electrolytic action |
| Answer» E. | |
| 154. |
The period of cleaning of a slow sand filter is ______ than rapid sand filter. |
| A. | Smaller |
| B. | Larger |
| C. | Slightly smaller |
| D. | Slightly larger |
| Answer» C. Slightly smaller | |
| 155. |
What is the permissible negative head loss of a rapid sand filter? |
| A. | 0.2-1m |
| B. | 0.1-0.5m |
| C. | 0.5-2m |
| D. | 0.8-1.2m |
| Answer» E. | |
| 156. |
What is the detention period of a clarifier used in the treatment of water? |
| A. | 1hour |
| B. | 2hours |
| C. | 3hours |
| D. | 4hours |
| Answer» D. 4hours | |
| 157. |
Which type of problem is caused in filter due to the accumulation of solids on the top surface of filter media? |
| A. | Clogging |
| B. | Air binding |
| C. | Sand incrustation |
| D. | Sand leakage |
| Answer» B. Air binding | |
| 158. |
Carmen-Kozney equation has been derived using which of the following equation? |
| A. | Cole brook white equation |
| B. | Bernoulli equation |
| C. | Darcy Weisbach equation |
| D. | Swamee jain equation |
| Answer» D. Swamee jain equation | |
| 159. |
In which type of tube settler, tubes are slightly inclined in the direction of normal flow? |
| A. | Solid contact clarifier |
| B. | Steeply inclined tube settler |
| C. | Vertical tube settler |
| D. | Horizontal tube settler |
| Answer» E. | |
| 160. |
The depth of an enclosed tank of a slow sand filter lies in the range of ______ |
| A. | 1-2m |
| B. | 2.5-4m |
| C. | 2-5m |
| D. | 3-5m |
| Answer» C. 2-5m | |
| 161. |
The filtration rate of a slow sand filter is _____ litres of water per square metre. |
| A. | 20 |
| B. | 30 |
| C. | 50 |
| D. | 100 |
| Answer» E. | |
| 162. |
The diatomite is applied on the septum at the rate of ______ |
| A. | 100gm/m² |
| B. | 200gm/m² |
| C. | 300gm/m² |
| D. | 400gm/m² |
| Answer» D. 400gm/m² | |
| 163. |
In which of the following filters, the rate of filtration is highest? |
| A. | Slow sand filter |
| B. | Rapid sand filter |
| C. | Pressure filter |
| D. | Roughing filter |
| Answer» D. Roughing filter | |
| 164. |
In a fill and draw type sedimentation tank, a detention period of ____ hours is provided. |
| A. | 6 |
| B. | 12 |
| C. | 18 |
| D. | 24 |
| Answer» E. | |
| 165. |
The value of Reynolds number R is 1.5. The coefficient of drag is? |
| A. | 8 |
| B. | 10 |
| C. | 12 |
| D. | 16 |
| Answer» E. | |
| 166. |
In a rectangular horizontal flow tank, the maximum permissible velocity is ____ m/Sec. |
| A. | 3 |
| B. | 0.3 |
| C. | 0.03 |
| D. | 0.003 |
| Answer» C. 0.03 | |
| 167. |
The detention period of the vertical flow clarifier is _______ |
| A. | 1-1.5 |
| B. | 2 |
| C. | 3.5 |
| D. | 4 |
| Answer» B. 2 | |
| 168. |
The detention period of a flash mixer is _________________ |
| A. | 2 minutes |
| B. | 30 minutes |
| C. | 1 hour |
| D. | 2 hours |
| Answer» B. 30 minutes | |
| 169. |
In which type of sedimentation, the flocculent suspension of high concentration takes place? |
| A. | Type I sedimentation |
| B. | Type II sedimentation |
| C. | Type III sedimentation |
| D. | Type IV sedimentation |
| Answer» E. | |
| 170. |
The quantity of water flowing per hour per unit horizontal area is called ____ |
| A. | Detention time |
| B. | Flowing through period |
| C. | Displacement time |
| D. | Overflow rate |
| Answer» E. | |
| 171. |
Why Magnesium carbonate is not commonly preferred as coagulant? |
| A. | It is expensive |
| B. | It does not remove color |
| C. | Formation of sludge |
| D. | The time required for floc formation is less |
| Answer» D. The time required for floc formation is less | |
| 172. |
Ferric chloride is effective over a pH range of __________ |
| A. | 3.5-6 |
| B. | 6.5-8 |
| C. | 3.5-6.5 |
| D. | 2-5 |
| Answer» D. 2-5 | |
| 173. |
The rate of change of velocity per unit distance normal to a section is called_______ |
| A. | Mean velocity |
| B. | Average velocity |
| C. | Mean velocity gradient |
| D. | Velocity gradient |
| Answer» D. Velocity gradient | |
| 174. |
__________ is an operation designed to force agitation in the fluid and induce coagulation. |
| A. | Sedimentation |
| B. | Flocculation |
| C. | Disinfection |
| D. | Aeration |
| Answer» C. Disinfection | |
| 175. |
Which of the following statement is wrong regarding Iron salt? |
| A. | Iron salt produces less floc than Alum |
| B. | Detention time for sedimentation by using Iron salt as coagulant is less |
| C. | Handling of Iron salt requires some skills |
| D. | Iron removes H₂S, taste and odor |
| Answer» B. Detention time for sedimentation by using Iron salt as coagulant is less | |
| 176. |
Which of the following goes to the flocculation tank in the following figure? |
| A. | B |
| B. | C |
| C. | E |
| D. | F |
| Answer» C. E | |
| 177. |
Which of the following is the correct expression regarding temporal mean velocity in the following figure? |
| A. | G = (P/μV)½ |
| B. | G = (P/μV) |
| C. | G = (P/μV)² |
| D. | G = (Pμ/V)½ |
| Answer» B. G = (P/μV) | |
| 178. |
_________ is the average of velocities at a point over a definite period of time. |
| A. | Mean velocity |
| B. | Relative velocity |
| C. | Velocity gradient |
| D. | Temporal mean velocity |
| Answer» E. | |
| 179. |
Which of the following represents the coagulant pipe in the following figure? |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 180. |
Which of the following represents the device which is used for sludge removal in the following figure? |
| A. | F |
| B. | E |
| C. | D |
| D. | B |
| Answer» D. B | |