1.
_______________ contains 98% of carbon.
2.
The main constituent of natural gas is :
3.
Which one is called black gold?
4.
Which of the following are the green house gas.
5.
....................... is renewable source of energy.
6.
Coke is Starting material for the preparation of
7.
Which of the following is not a fossil fuel ?
8.
Coal mines in our country are in :
10.
The slurry residue after obtaining biogas is used as
