Teaching BPSC बिहार प्राथमिक (1 to 5) शिक्षक भर्ती 4.0 Mock Test General Knowledge Ecology and Environment Environmental pollution
The maximum allowable concentration of fluorides in drinking water is:
1
1.00 mg per litre
2
1.25 mg per litre
3
1.50 mg per litre
4
More than one of the above
5
None of the above