MCQOPTIONS
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MCQOPTIONS
This section includes 22 Mcqs, each offering curated multiple-choice questions to sharpen your Environmental Science knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The solar evaporation can yield about ___ kg of fresh water per day per m2 of basin surface. |
| A. | 5 |
| B. | 10 |
| C. | 15 |
| D. | 20 |
| Answer» B. 10 | |
| 2. |
For removal of manganese from water, ________ mg of oxygen is required. |
| A. | 0.14 |
| B. | 0.5 |
| C. | 0.29 |
| D. | 0.9 |
| Answer» D. 0.9 | |
| 3. |
State whether the following statement is true or false.Fluorides in solution form are preferred over powdered form for fluoridation. |
| A. | True |
| B. | False |
| Answer» C. | |
| 4. |
The process of reducing the fluoride content from water is called _____ |
| A. | Chlorination |
| B. | Fluoridation |
| C. | Defluoridation |
| D. | Flocculation |
| Answer» D. Flocculation | |
| 5. |
Removal of iron from water takes place at a pH of ______ |
| A. | 1.5 |
| B. | 3 |
| C. | 8.2 |
| D. | 9.4 |
| Answer» E. | |
| 6. |
The maximum salt concentration up to which desalination of brackish water is possible by Electro-dialysis is |
| A. | 1000ppm |
| B. | 2000ppm |
| C. | 3000ppm |
| D. | 5000ppm |
| Answer» E. | |
| 7. |
In which desalination process, the cooling of sea water is done to obtain fresh water? |
| A. | Distillation |
| B. | Electro-dialysis |
| C. | Reverse osmosis |
| D. | Freezing |
| Answer» E. | |
| 8. |
One cubic metre of bone can treat how much quantity of water containing 3.5 ppm of fluoride? |
| A. | 10m3 |
| B. | 100m3 |
| C. | 1000m3 |
| D. | 10000m3 |
| Answer» C. 1000m3 | |
| 9. |
What is the dose of copper sulfate required for the treatment of water? |
| A. | 0.3-0.6ppm |
| B. | 2-6ppm |
| C. | 4-8ppm |
| D. | 10-20ppm |
| Answer» B. 2-6ppm | |
| 10. |
At which temperature, the bone is calcinated during defluoridation with calcium phosphate? |
| A. | 100-200oC |
| B. | 200-300oC |
| C. | 400-600oC |
| D. | 500-800oC |
| Answer» D. 500-800oC | |
| 11. |
Which of the following is not used for defluoridation? |
| A. | Calcium phosphate |
| B. | Copper sulfate |
| C. | Alum |
| D. | Bone charcoal |
| Answer» C. Alum | |
| 12. |
In Electro-dialysis, the electric energy which required is |
| A. | Directly proportional to cation permeable membrane |
| B. | Directly proportional to anion permeable membrane |
| C. | Directly proportional to salt concentration |
| D. | Inversely proportional to salt concentration |
| Answer» D. Inversely proportional to salt concentration | |
| 13. |
State whether the following statement is true or false.The pressure freezing process works on the vacuum free vapor compression principle. |
| A. | True |
| B. | False |
| Answer» C. | |
| 14. |
When small amounts of iron and manganese are present in water, they are removed by |
| A. | Aeration |
| B. | Coagulation |
| C. | Manganese zeolite |
| D. | Filtration |
| Answer» D. Filtration | |
| 15. |
State whether the following statement is true or false.Activated carbon in powder form is applied in the mixing basin. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 16. |
Removal of manganese from water takes place at a pH of ______ |
| A. | 1.5 |
| B. | 3 |
| C. | 6 |
| D. | 9.4 |
| Answer» E. | |
| 17. |
There are protozoa present in the water. Its name is Dinobryen. What is the dose of copper sulfate required to kill it? |
| A. | 0.02ppm |
| B. | 0.3ppm |
| C. | 0.5ppm |
| D. | 0.8ppm |
| Answer» C. 0.5ppm | |
| 18. |
For removal of iron from water, ________ mg of oxygen is required. |
| A. | 0.14 |
| B. | 0.5 |
| C. | 1 |
| D. | 1.5 |
| Answer» B. 0.5 | |
| 19. |
Activated carbon can be applied to raw water ______ treatment process. |
| A. | During |
| B. | Ahead of |
| C. | Before |
| D. | After |
| Answer» C. Before | |
| 20. |
Iron and Manganese are generally present in water supplies as |
| A. | Suspension |
| B. | Solution |
| C. | Colloidal particles |
| D. | Either suspension or solution |
| Answer» E. | |
| 21. |
The brown tinge in the water is due to the presence |
| A. | Zinc |
| B. | Copper |
| C. | Iron |
| D. | Manganese |
| Answer» E. | |
| 22. |
The dose of activated carbon in powdered form is controlled by |
| A. | Chromatography |
| B. | Distillation |
| C. | Threshold odor test |
| D. | MPN test |
| Answer» D. MPN test | |