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21.

Non-renewable environmental resources include various metals non-metalic minerals and

A.	Coal	B.	Natural gas
C.	Oil	D.	Fossil fuels

22.

Thick clouds of smoke containing soot and other particles coming out of the factories cause health problems for nearby people. Such as irritation of eyes and:

A.	Heart diseases	B.	Gastric diseases
C.	Kidney trouble	D.	None of these

23.

Carbon monoxide is a poisonous gas, 1% of which in the air can kill a person in:

A.	No time	B.	In ten minutes
C.	In five minutes	D.	In fifteen minutes

24.

Acid rain brings with it:

A.	Sulphuric acid alone	B.	Nitric acid alone
C.	Nitrous acid and sulphurous acid	D.	Sulphuric acid, sulphurous acid nitric acid and, nitrous acid

25.

Certain cities of Pakistan have been subjected to tremendous air pollution due to increased:

A.	Urbanization	B.	Mechanization
C.	Industrialization	D.	Civilization

26.

Of the total body weight of the organism, water constitutes about:

A.	50% to 80%	B.	40% to 60%
C.	70 to 90%	D.	80% to 90%

27.

The amount of fresh water on our planet is:

A.	2%	B.	1%
C.	3%	D.	4%

28.

Of the total fresh water, 10% is used in homes whereas 90% is used in:

A.	Irrigation	B.	Industry
C.	Irrigation and industry	D.	In making dams

29.

The depleted soils can be enriched by the addition of:

A.	More soil	B.	Drugs
C.	Chemical fertilizers	D.	Cattle dung

30.

The land may be abused by:

A.	Erosion and trampling by animals	B.	Poor agricultural practices and excessive water
C.	Over-grazing and extensive ploughing	D.	Erosion, poor agricultural practices and over grazing