Iron content in Indian iron ore is about __________ percent.

Question: Dissolved oxygen content in river water is around __________ ppm.
[A].

5

[B].

100

[C].

250

[D].

500

Answer: Option A

Explanation:

No answer description available for this question.

Question: __________ substances present in sewage are removed in grit chamber during sewage treatment.
[A].

Organic

[B].

Fatty

[C].

Inorganic

[D].

Dissolved

Answer: Option C

Explanation:

No answer description available for this question.

Question: Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools).
[A].

1-2

[B].

5-10

[C].

15-20

[D].

25-30

Answer: Option B

Explanation:

No answer description available for this question.