1.
_______________ contains 98% of carbon.
2.
The slurry residue after obtaining biogas is used as
3.
Which of the following are the green house gas.
4.
Coal mines in our country are in :
5.
Coke is Starting material for the preparation of
6.
Which of the following is not a fossil fuel ?
7.
The main constituent of natural gas is :
9.
....................... is renewable source of energy.
10.
Which one is called black gold?
