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41.

Polution can be controlled by:

A.	Sewage treatment	B.	Manufacturing electricity
C.	By checking atomic blasts	D.	All of the above

42.

The ultraviolet radiations from the sun cause reaction that produce:

A.	Carbon monoxide	B.	Sulphur dioxide
C.	Ozone	D.	Flourides

43.

Which major aerosol pollutant is present in jet aircraft emission?

A.	SO2	B.	Fluoro-carbons
C.	CCI4	D.	CO

44.

Most important causative pollutant of soil may be:

A.	Plastics	B.	Iron junks
C.	Detergents	D.	Glass junks

45.

A pollutant is any substance, chemical cycles

A.	The natural geo-chemical cycles	B.	The natural balance of our environment
C.	The natural flora of a place	D.	The natural wildlife of a region

46.

BOD of polluted water is increased by

A.	Algae	B.	Moss
C.	Ferns	D.	Distillated wastes

47.

Which one of the following is fungicide?

A.	DDT	B.	Bordeaux mixture
C.	2,4-D	D.	DCMU

48.

Thermal pollution in water bodies is caused due to discharge of:

A.	Hot water from power plants	B.	Hot chemicals from industries
C.	Waste from mines	D.	Waste from agricultural fields

49.

When DDT was applied in an orchard as a pesticide, the fruit production decreased. This happened because:

A.	DDT is a growth retardant	B.	DDT disturbed hormonal balance essential for fruit setting
C.	DDT killed the pollinating insects along with the pests	D.	DDT inhibited flowering

50.

Air pollution is caused by:

A.	Automobile exhausts	B.	Radioactive substances
C.	Smoke	D.	All of the above