Coal and petroleum Worksheet-1
A. brownish-black coal with high moisture and ash content
B. dull black coal with low moisture and ash content
C. hard coal with high heating value
A. limited B. UnlimitedRead More...
Coal and petroleum Worksheet-2
A. a by-product while extracting coal
B. a by-product in refining of petrol
C. a by-product of the process of manufacturing coke.
A. Plants and trees B. Tiny marine organisms
C. Shrubs D. Algae and fungiRead More...