1.
_______________ contains 98% of carbon.
2.
The slurry residue after obtaining biogas is used as
3.
The main constituent of natural gas is :
4.
....................... is renewable source of energy.
6.
Which of the following are the green house gas.
7.
Coal mines in our country are in :
8.
Which of the following is not a fossil fuel ?
9.
Coke is Starting material for the preparation of
10.
Which one is called black gold?
