2.
Which one is called black gold?
3.
Which of the following is not a fossil fuel ?
4.
The slurry residue after obtaining biogas is used as
5.
Coal mines in our country are in :
6.
....................... is renewable source of energy.
7.
_______________ contains 98% of carbon.
8.
Coke is Starting material for the preparation of
9.
The main constituent of natural gas is :
10.
Which of the following are the green house gas.
