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Question-1
Global warming takes place due to increase of which gas in air?

(A) Carbon monoxide	(B) Carbon dioxide
(C) Ammonia	(D) Oxygen

Question-2 Which of the following festivals is associated with the conservation of plants?

(A) Van Mahotsav	(B)Holi
(C)Bihu	(D)Diwali

Question-3 Which of the following is essential for photosynthesis?

(A) Fertilizer	(B)Manure
(C)Weedkiller	(D)Chlorophyll

Question-4
Which of the following activities is not a method to improve the environment?

(A) Disposing of waste properly.	(B) Reducing the use of fuels.
(C) Producing less rubbish.	(D) Using CFC products.

Question-5 Which of the following does not cause water pollution?

(A) Sewage	(B)Fertilizers
(C)Pesticides	(D)Manures

Question-6
Which of the following elements present in a fossil fuel causes pollution on burning?

(A) Hydrogen	(B) Carbon
(C) Sulphur	(D) Oxygen

Question-7 Which of the following is needed for burning?

(A) Air	(B)Water
(C)Sunlight	(D)Wind

Question-8 Which of the following causes ozone depletion?

(A) Nitric acid	(B)Chlorofluorocarbon
(C)Compressed natural gas	(D)Sulphuric acid

Question-9
Electric wires are usually made of

(A) Aluminium	(B) Magnesium
(C) Copper	(D) Silver

Question-10
Which of the following gases is not a green house gas?

(A) Sulphur dioxide	(B) Carbon dioxide
(C) Methane	(D) Oxygen

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Std 8

CBSE

Practice in Related Chapters
Combustion,flame and fuel
Coal and Petroleum
Synthetic Fibres and Plastics
Pollution of Air and Water
Metals and Non-Metals