1.
Which one is called black gold?
2.
Which of the following are the green house gas.
3.
The slurry residue after obtaining biogas is used as
5.
Coal mines in our country are in :
6.
_______________ contains 98% of carbon.
7.
Coke is Starting material for the preparation of
8.
Which of the following is not a fossil fuel ?
9.
The main constituent of natural gas is :
10.
....................... is renewable source of energy.
