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31.

Misuse of land involves:

A.	Construction of canals	B.	Construction of bridges
C.	Rapid urbanization	D.	Erosion

32.

Pollution of soil may destroy its structure and:

A.	Fertility	B.	Porosity
C.	Thickness	D.	Nitrates

33.

The natural nitrogen cycle is greatly affected by the excessive use of:

A.	Sulphate fertilizers	B.	Insecticides
C.	Phosphate fertilizers	D.	Nitrate fertilizers

34.

A chemical, which kills the weeds, is known as:

A.	Insecticide	B.	Pesticide
C.	Herbicide	D.	Germicide

35.

All the non-cultivated plants and non-comesticated animals are referred to as:

A.	Useless organism	B.	Harmful life
C.	Wild life	D.	Enemies of man

36.

The precious skins of beavers, muskrats, seals, minks and foxes etc, are used as luxury furs and in:

A.	Textile industry	B.	Leather industry
C.	Chemical industry	D.	Soap industry

37.

About 95% of the energy requirements in Pakistan are met with by the:

A.	Nuclear power plants	B.	Hdroelectric power
C.	Fossil fuels	D.	Solar energy

38.

The atomic energy is derived by splitting the nuclei of a:

A.	Radioactive element	B.	Radioactive cell
C.	Radioactive atom	D.	Radioactive substance

39.

The primary nuclear fuel used in the atom today is:

A.	Uranium-234	B.	Uranium-235
C.	Uranium-236	D.	Uranium-237

40.

Exposure of human beings to high energy from nuclear power plants can cause:

A.	Cancer of skin and bone	B.	Cancer of heart and brain
C.	Cancer of skin and bone marrow	D.	Cancer of kidneys