1.
....................... is renewable source of energy.
2.
The main constituent of natural gas is :
4.
The slurry residue after obtaining biogas is used as
5.
Which one is called black gold?
6.
Coal mines in our country are in :
7.
Which of the following is not a fossil fuel ?
8.
Coke is Starting material for the preparation of
9.
Which of the following are the green house gas.
10.
_______________ contains 98% of carbon.
