MCQOPTIONS
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MCQOPTIONS
This section includes 112 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. |
By aeration process, dissolved iron is oxidized into ____________ |
| A. | Ferrous oxide |
| B. | Ferric oxide |
| C. | Ferrous hydroxide |
| D. | Ferric hydroxide |
| Answer» C. Ferrous hydroxide | |
| 2. |
In which process, the fluoride content of water is raised? |
| A. | Chlorination |
| B. | Fluoridation |
| C. | Defluoridation |
| D. | Flocculation |
| Answer» C. Defluoridation | |
| 3. |
At which temperature, the bone is calcinated during defluoridation with calcium phosphate? |
| A. | 100-200°C |
| B. | 200-300°C |
| C. | 400-600°C |
| D. | 500-800°C |
| Answer» D. 500-800°C | |
| 4. |
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. | |
| 5. |
Activated carbon can be applied to raw water ______ treatment process. |
| A. | During |
| B. | Ahead of |
| C. | Before |
| D. | After |
| Answer» C. Before | |
| 6. |
Removal of manganese from water takes place at a pH of ______ |
| A. | 1.5 |
| B. | 3 |
| C. | 6 |
| D. | 9.4 |
| Answer» E. | |
| 7. |
The presence of Sulfate iron in the water results in ____________ |
| A. | Odorless water |
| B. | Acidity in water |
| C. | Colorless water |
| D. | Growth of crenothrix in water mains |
| Answer» C. Colorless water | |
| 8. |
Which of the following is used for the control of taste and odor in water? |
| A. | Sedimentation |
| B. | Coagulation |
| C. | Filtration |
| D. | Activated carbon |
| Answer» E. | |
| 9. |
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 | |
| 10. |
Which of the following is not a property of activated carbon? |
| A. | It is impermeable |
| B. | It has many carbon atoms with free valencies |
| C. | It is available in granular as well as powder form |
| D. | It has a prolonged suspension |
| Answer» B. It has many carbon atoms with free valencies | |
| 11. |
The thickness of the activated carbon filter bed is ____________ |
| A. | 10-20cm |
| B. | 30-80cm |
| C. | 75-100cm |
| D. | 40-50cm |
| Answer» D. 40-50cm | |
| 12. |
_______ is produced by passing a carbonaceous material through a heating mechanism at high temperature. |
| A. | Potassium per-manganate |
| B. | Potassium dichromate |
| C. | Activated carbon |
| D. | Iodine |
| Answer» D. Iodine | |
| 13. |
The pressure freezing process works on the vacuum free vapor compression principle. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 14. |
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 | |
| 15. |
Which of the following is not a type of distillation plant? |
| A. | Vertical tube evaporator |
| B. | Multistage flash evaporator |
| C. | Tube settler |
| D. | Multi-effect multistage flash evaporator |
| Answer» D. Multi-effect multistage flash evaporator | |
| 16. |
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 | |
| 17. |
The reddish tinge in the water is due to the presence of ____________ |
| A. | Zinc |
| B. | Copper |
| C. | Iron |
| D. | Manganese |
| Answer» D. Manganese | |
| 18. |
Organic contaminants are removed from the water by the process of ______ |
| A. | Water softening |
| B. | Demineralization |
| C. | Absorption |
| D. | Adsorption |
| Answer» E. | |
| 19. |
What is the size of the coarse screen used in pretreatment of water? |
| A. | 25mm |
| B. | 50mm |
| C. | 75mm |
| D. | 100mm |
| Answer» B. 50mm | |
| 20. |
Which process of water treatment is done to avoid floating debris, branches, trees or other large particles suspended in water? |
| A. | Screening |
| B. | Aeration |
| C. | Primary sedimentation |
| D. | Secondary sedimentation |
| Answer» B. Aeration | |
| 21. |
Which of the following is not used for defluoridation? |
| A. | Calcium phosphate |
| B. | Copper sulfate |
| C. | Alum |
| D. | Bone charcoal |
| Answer» C. Alum | |
| 22. |
Aswan high dam is situated in |
| A. | China |
| B. | Egypt |
| C. | America |
| D. | Europe |
| Answer» C. America | |
| 23. |
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 | |
| 24. |
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 | |
| 25. |
In which desalination process, solar energy is used? |
| A. | Reverse osmosis |
| B. | Freezing |
| C. | Electro-dialysis |
| D. | Solar evaporation |
| Answer» E. | |
| 26. |
The thickness of the layers of filter sand of zeolite softener is ____________ |
| A. | 20cm |
| B. | 30cm |
| C. | 40cm |
| D. | 100cm |
| Answer» E. | |
| 27. |
When activated carbon is applied at more than one point, then it is called ________ |
| A. | Dual treatment |
| B. | Split treatment |
| C. | Sludge treatment |
| D. | Carbonaceous treatment |
| Answer» C. Sludge treatment | |
| 28. |
Which of the following statement is wrong regarding hard water? |
| A. | It causes more consumption of soap in laundry work |
| B. | It causes difficulties in the manufacturing process |
| C. | It increases the taste of food |
| D. | It causes the formation of scales on the boilers |
| Answer» D. It causes the formation of scales on the boilers | |
| 29. |
The temperature at which the softening of water takes place by lime soda process is ____________ |
| A. | 10°-21°C |
| B. | 20°-30°C |
| C. | 39°-45°C |
| D. | 90°C |
| Answer» B. 20°-30°C | |
| 30. |
The permanent hardness can be removed by adding lime and soda. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 31. |
The chemical formula of Permutit is ____________ |
| A. | SiOAl₂O₃Na₂O |
| B. | SiO₂Al₂O₃Na₂O |
| C. | SiO₂Al₂O₃NaO |
| D. | SiO₃Al₂O₃Na₂O |
| Answer» C. SiO₂Al₂O₃NaO | |
| 32. |
The color of the artificial zeolite permutit is ____________ |
| A. | Grey |
| B. | Yellow |
| C. | Green |
| D. | White |
| Answer» E. | |
| 33. |
Natural zeolite is mainly processed from ____________ |
| A. | White sand |
| B. | Green sand |
| C. | Grey sand |
| D. | Red sand |
| Answer» C. Grey sand | |
| 34. |
Permutit has an exchange value of ________ grams of hardness per m³ of zeolite. |
| A. | 10,000 |
| B. | 20,000-30,000 |
| C. | 35,000-40,000 |
| D. | 40,000-50,000 |
| Answer» D. 40,000-50,000 | |
| 35. |
In which process of water softening, the chemicals are added to remove hardness from water? |
| A. | Lime soda process |
| B. | Zeolite process |
| C. | Boiling |
| D. | Demineralization process |
| Answer» B. Zeolite process | |
| 36. |
Zeolites are complex compound of ____________ |
| A. | Aluminium and lime |
| B. | Silica and soda |
| C. | Aluminium, silica and soda |
| D. | Lime and soda |
| Answer» D. Lime and soda | |
| 37. |
The sludge in water softening accelerator is deposited at ____________ |
| A. | Sedimentation tank |
| B. | Reaction zone |
| C. | Concentrator |
| D. | Secondary mixing zone |
| Answer» D. Secondary mixing zone | |
| 38. |
Poor sanitation is an increasing problems of |
| A. | South America and Africa |
| B. | Middle East |
| C. | Asia |
| D. | All of these |
| Answer» E. | |
| 39. |
Hot and wet climate are the best condition to grow |
| A. | Plants |
| B. | Animals |
| C. | Insects, Bacteria, viruses |
| D. | All of these |
| Answer» E. | |
| 40. |
Softening chemicals, lime and soda do not depend on ____________ |
| A. | Free carbon dioxide present |
| B. | Non carbonate hardness |
| C. | Total magnesium |
| D. | Carbonate hardness |
| Answer» E. | |
| 41. |
What is the pH at which recarbonation should be done? |
| A. | 7 |
| B. | 4.5 |
| C. | 8.2 |
| D. | 9.5 |
| Answer» E. | |
| 42. |
Which form of solute stabilization occurs when water passes through limestone? |
| A. | Chlorination |
| B. | Liming |
| C. | Re-carbonation |
| D. | Super-chlorination |
| Answer» C. Re-carbonation | |
| 43. |
Solids are removed from the water by which of the following unit operation? |
| A. | Inter facial contact |
| B. | Solid stabilization |
| C. | Ion transfer |
| D. | Solids transfer |
| Answer» E. | |
| 44. |
In which type of aerator, the flow of water is divided into fine streams and small droplets? |
| A. | Cascade aerator |
| B. | Inclined apron aerator |
| C. | Spray aerator |
| D. | Gravel bed aerator |
| Answer» B. Inclined apron aerator | |
| 45. |
Identify the incorrect statement regarding aeration process. |
| A. | It removes taste and odor |
| B. | It increases the dissolved oxygen content of water |
| C. | It increases the carbon dioxide content of water |
| D. | It is used for mixing chemicals with water |
| Answer» D. It is used for mixing chemicals with water | |
| 46. |
The head loss through screen depends on _______________ |
| A. | Shape of screen elements |
| B. | Open area, block area |
| C. | Approach velocity |
| D. | Nature of their construction, approach velocity |
| Answer» E. | |
| 47. |
Which of the following desalination method is more suitable for brackish water than sea water? |
| A. | Distillation |
| B. | Solar evaporation |
| C. | Reverse osmosis |
| D. | Freezing |
| Answer» D. Freezing | |
| 48. |
What concentration of iron and manganese will cause unpleasant taste and odor of water? |
| A. | 1ppm |
| B. | 2ppm |
| C. | 3ppm |
| D. | >3ppm |
| Answer» E. | |
| 49. |
Which of the following is the best evaporative desalinating method? |
| A. | Vertical tube evaporator |
| B. | Multistage flash evaporator |
| C. | Tube settler |
| D. | Multi-effect multistage flash evaporator |
| Answer» C. Tube settler | |
| 50. |
The number of stages involved in the desalination using a multistage flash evaporator is _________________ |
| A. | 20 |
| B. | 38 |
| C. | 49 |
| D. | 69 |
| Answer» E. | |