MCQOPTIONS
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MCQOPTIONS
This section includes 18 Mcqs, each offering curated multiple-choice questions to sharpen your Environmental Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Fluorex is a special mixture of ____________ |
| A. | Di-calcium phosphate and carbon |
| B. | Tri-calcium phosphate and hydroxyapatite |
| C. | Di-calcium phosphate and phosphoric acid |
| D. | Tri-calcium phosphate and carbon |
| Answer» C. Di-calcium phosphate and phosphoric acid | |
| 2. |
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 | |
| 3. |
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 | |
| 4. |
The process of reducing the fluoride content from water is called _____ |
| A. | Chlorination |
| B. | Fluoridation |
| C. | Defluoridation |
| D. | Flocculation |
| Answer» D. Flocculation | |
| 5. |
The fluoride concentration for prevention of dental caries is ____________ |
| A. | 1mg/l |
| B. | 2mg/l |
| C. | 3mg/l |
| D. | 4mg/l |
| Answer» B. 2mg/l | |
| 6. |
WHICH_OF_THE_FOLLOWING_IS_NOT_USED_FOR_DEFLUORIDATION??$ |
| A. | Calcium phosphate |
| B. | Copper sulfate |
| C. | Alum |
| D. | Bone charcoal |
| Answer» C. Alum | |
| 7. |
One cubic metre of bone can treat how much quantity of water containing 3.5 ppm of fluoride?$ |
| A. | 10m<sup>3</sup> |
| B. | 100m<sup>3</sup> |
| C. | 1000m<sup>3</sup> |
| D. | 10000m<sup>3</sup> |
| Answer» C. 1000m<sup>3</sup> | |
| 8. |
At_which_temperature,_the_bone_is_calcinated_during_defluoridation_with_calcium_phosphate?$ |
| A. | 100-200<sup>o</sup>C |
| B. | 200-300<sup>o</sup>C |
| C. | 400-600<sup>o</sup>C |
| D. | 500-800<sup>o</sup>C |
| Answer» D. 500-800<sup>o</sup>C | |
| 9. |
Fluorex is a special mixture of |
| A. | Di-calcium phosphate and carbon |
| B. | Tri-calcium phosphate and hydroxyapatite |
| C. | Di-calcium phosphate and phosphoric acid |
| D. | Tri-calcium phosphate and carbon |
| Answer» C. Di-calcium phosphate and phosphoric acid | |
| 10. |
Which material is used for removing fluorides from hard water containing 3ppm of fluorides? |
| A. | Lime |
| B. | Copper sulfate |
| C. | Synthetic tri-calcium phosphate |
| D. | Bone charcoal |
| Answer» B. Copper sulfate | |
| 11. |
Which material is used in contact filters for removal of fluorides? |
| A. | Calcium phosphate |
| B. | Copper sulfate |
| C. | Synthetic tri-calcium phosphate |
| D. | Bone charcoal |
| Answer» D. Bone charcoal | |
| 12. |
The process of reducing the fluoride content from water is called ____? |
| A. | Chlorination |
| B. | Fluoridation |
| C. | Defluoridation |
| D. | Flocculation |
| Answer» D. Flocculation | |
| 13. |
What happens when water contains 8-20 ppm of fluoride concentration? |
| A. | Blue baby disease |
| B. | Crippling fluorosis |
| C. | Dental fluorosis |
| D. | Mottling of teeth |
| Answer» C. Dental fluorosis | |
| 14. |
As far as safer handling is considered, which of the following is used for fluoridation? |
| A. | Sodium fluoride |
| B. | Sodium silico fluoride |
| C. | Hydrofluosilicic acid |
| D. | Sodium fluro carbonate |
| Answer» D. Sodium fluro carbonate | |
| 15. |
Which of the following is the pure compound? |
| A. | Sodium fluoride |
| B. | Sodium silico fluoride |
| C. | Hydrofluosilicic acid |
| D. | Sodium fluro carbonate |
| Answer» B. Sodium silico fluoride | |
| 16. |
Which of the following is not used as a fluoride compound? |
| A. | Sodium fluoride |
| B. | Sodium silico fluoride |
| C. | Hydrofluosilicic acid |
| D. | Sodium fluro carbonate |
| Answer» E. | |
| 17. |
In which process, the fluoride content of water is raised? |
| A. | Chlorination |
| B. | Fluoridation |
| C. | Defluoridation |
| D. | Flocculation |
| Answer» C. Defluoridation | |
| 18. |
The fluoride concentration for prevention of dental caries is |
| A. | 1mg/l |
| B. | 2mg/l |
| C. | 3mg/l |
| D. | 4mg/l |
| Answer» B. 2mg/l | |