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61.

The abbreviation MPN stand for:

A.	Most probable number	B.	Millions per night
C.	Millennium of probable number	D.	None of these

62.

The ground water pollution is due to excess of:

A.	DDT is a growth retardant	B.	Pesticides
C.	Minerals	D.	Carbon deposit

63.

Indiscriminate use of fertilizers have lead to:

A.	Air pollution	B.	Soil pollution
C.	Water pollution	D.	All of the above

64.

Which of the following is not used for disinfection of drinking water?

A.	Chlorine	B.	Chloramines
C.	Phenyl	D.	Ozone

65.

Which of the following is a biodegradable pollutant?

A.	Sewage	B.	Asbestos
C.	Plastic	D.	All of these

66.

A very harmful fibrous component causing pollution an inflicting diseases of lungs in human beings:

A.	Grease	B.	Asbestos
C.	Eichhornia roots	D.	ABS micelle

67.

With the increase in water pollution, the BOD:

A.	Decreases	B.	Increases
C.	Remains the same	D.	Is no measure of pollution

68.

The enrichment of water by nutrients is:

A.	Mineralization	B.	Oligotrophication
C.	Eutrophication	D.	All of these

69.

Which of the following is not a commonly used pesticide?

A.	Aldrin	B.	Lindane
C.	Chlordane	D.	Chloremphenicol

70.

The most harmful pesticide is:

A.	PAN	B.	2,4,5-T
C.	2,4-D	D.	DDT