MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Biology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
How many gallons of waste-water is treated before being released into the natural water-bodies? |
| A. | Millions |
| B. | Billions |
| C. | Trillions |
| D. | Quadrillion |
| Answer» B. Billions | |
| 2. |
Where is the major part of sludge pumped in secondary treatment? |
| A. | Aeration tank |
| B. | Anaerobic sludge digesters |
| C. | Rivers |
| D. | Drains |
| Answer» C. Rivers | |
| 3. |
What is activated sludge? |
| A. | Distilled bacteria |
| B. | Fermented bacteria |
| C. | Sediment bacterial flocs |
| D. | Fungi |
| Answer» D. Fungi | |
| 4. |
Which of the following statements is not true regarding BOD? |
| A. | Sewage water is treated until the BOD is reduced. |
| B. | BOD is a measure of organic matter present in the water |
| C. | Greater the BOD, lesser is the polluting potential of water |
| D. | BOD measures the rate of uptake of oxygen |
| Answer» D. BOD measures the rate of uptake of oxygen | |
| 5. |
What are flocs? |
| A. | Masses of fungi |
| B. | Masses of algae |
| C. | Masses of animals |
| D. | Masses of bacteria |
| Answer» E. | |
| 6. |
The effluent from the primary settling tank is taken for secondary treatment. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
Which of the following is not correct regarding the primary treatment of waste-water? |
| A. | Initially floating debris is removed by distillation |
| B. | Grit and pebbles are removed by sedimentation |
| C. | Solids that settle form the primary sludge |
| D. | Supernatant forms the effluent |
| Answer» B. Grit and pebbles are removed by sedimentation | |
| 8. |
Primary treatment involves filtration and distillation. |
| A. | False |
| B. | True |
| Answer» B. True | |
| 9. |
In how many stages the treatment of waste-water in STPs is carried out? |
| A. | One |
| B. | Two |
| C. | Three |
| D. | Four |
| Answer» C. Three | |
| 10. |
What is the full form of STPs? |
| A. | Sexually transmitted problems |
| B. | Sewage treatment plants |
| C. | Serum tissue plasminogen |
| D. | Sebaceous tissue plasminogen |
| Answer» C. Serum tissue plasminogen | |
| 11. |
What is the major component of waste-water? |
| A. | Pure water |
| B. | Human excreta |
| C. | Sand |
| D. | Clay |
| Answer» C. Sand | |