Q51 of 65 Page 89

One of the following is not an exhaustible source of energy. This one is:

Biogas can be produced from raw materials such as agricultural waste, manure, plant material, green waste or food waste. It is a renewable source of energy. Natural gas, coal gas and petroleum gas are fossil fuels and are nonrenewable sources of energy.

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49

The gas which occurs above the petroleum oil trapped under the rocks is called:

 50

Which of the following is being used as a source of hydrogen gas needed to manufacture fertilizers?

 52

The slow process by which the large land plants and trees buried deep under the earth have become coal is called:

 53

Which of the following is used as a reducing agent in the extraction of iron metal?