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