Answer: Option B. -> Gondwana system
Answer: (b)

Answer: Option B. -> Gondwana system
Answer: (b)

Answer: Option B. -> Digboi
Answer: (b)The Digboi refinery was set up in 1901 by Assam Oil Company Ltd.It is situated in upper Assam district of Tinsukia. Digboi oilfield has the oldest running oil well in the world.

Answer: Option A. -> Monazite
Answer: (a)

Answer: Option C. -> 8.7%
Answer: (c)

Answer: Option D. -> 4 3 1 2
Answer: (d)

Answer: Option D. -> Petroleum Exploration
Answer: (d)

Answer: Option A. -> Coal
Answer: (a)Coal is the most important source of power in India. More than 65% of India’s electricity generation capacity comes from thermal power plants, with about 85% of the country’s thermal power generation being coal-based. India’s electricity sector consumes about 72% of the coal produced in the country.

Answer: Option C. -> 1 3 2 4
Answer: (c)

Answer: Option B. -> Damodar Valley
Answer: (b)
The Damodar river valley contains store houses or coal seems, the richest, largest and most productive coalfields of India.
The Damodar valley coal occurring in the Damuda series of the Lower Gondwana rocks is noted for exceptionally rich coal deposits. About 75 per cent of India’s coal is mined from this valley. There are several coalfields of which Jharia, Bokaro, Ramgarh, Chandrapura and Karanpura are the premier producers.