Teaching BPSC बिहार प्राथमिक (1 to 5) शिक्षक भर्ती 4.0 Mock Test General Knowledge Ecology and Environment
Acid rain is caused by the pollution of environment by
1
carbon dioxide and nitrogen
2
carbon monoxide and carbon dioxide
3
nitrous oxide and sulphur dioxide
4
More than one of the above
5
None of the above