SELECT * FROM question_mgmt as q WHERE id=6584 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=12 AND subId=16 AND chapterId=368 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 8th science Coal and Petroleum fill in the blanks a fossil fuels are nbsp

Question:

Fill in the blanks :
(a) Fossil fuels are               ,              and                       .
(b) Process of separation of different constituents from petroleum is called                 .
(c) Least polluting fuel for vehicle is                       .

Answer:

(a) Coal, petroleum, natural gas

Fossil fuels are made up of dead vegetation and animals. This process takes years to make petroleum.

(b) Refining

For purifying the petroleum, refining process is done. It separates the different constituents from petroleum which is known as refining.

(c) CNG

CNG is a clean fuel. It does not produce any harmful gases. The use of CNG in vehicles make our environment clean.


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