Explore topic-wise MCQs in Environmental Engineering.

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
Discussion
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
Discussion
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
Discussion
4.

The process of reducing the fluoride content from water is called _____

A. Chlorination
B. Fluoridation
C. Defluoridation
D. Flocculation
Answer» D. Flocculation
Discussion
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
Discussion
6.

WHICH_OF_THE_FOLLOWING_IS_NOT_USED_FOR_DEFLUORIDATION??$

A. Calcium phosphate
B. Copper sulfate
C. Alum
D. Bone charcoal
Answer» C. Alum
Discussion
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>
Discussion
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
Discussion
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
Discussion
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
Discussion
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
Discussion
12.

The process of reducing the fluoride content from water is called ____?

A. Chlorination
B. Fluoridation
C. Defluoridation
D. Flocculation
Answer» D. Flocculation
Discussion
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
Discussion
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
Discussion
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
Discussion
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.
Discussion
17.

In which process, the fluoride content of water is raised?

A. Chlorination
B. Fluoridation
C. Defluoridation
D. Flocculation
Answer» C. Defluoridation
Discussion
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
Discussion