Teaching BPSC बिहार मध्य विद्यालय (6 to 8) शिक्षक भर्ती 4.0 Mock Test General Knowledge Indian Geography Indian Economic and Human Geography
Which of the following energy resources has the least environmental impact during its lifecycle?
1
Coal
2
Biogas
3
Oil
4
More than one of the above
5
None of the above