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111.

The bacteria which can survive without oxygen is called

A.	anaerobic bacteria	B.	pathogenic bacteria
C.	aerobic bacteria	D.	non-pathogenic bacteria

112.

Bacteria which can survive with or without free oxygen is known as facultative bacteria.

Correct

Incorrect

113.

The bacterias which do not cause any disease are called pathogenic bacterias.

Right

Wrong

114.

Bacterias which cause disease are called

A.	anaerobic bacteria	B.	facultative bacterias
C.	aerobic bacteria	D.	none of these

115.

The total count of bacteria per cubic centimetre for domestic purposes varies from

A.	0 to 100	B.	100 to 150
C.	150 to 200	D.	200 to 250

116.

Copper sulphate is the most common chemical used for controlling

A.	bacteria	B.	algae
C.	silt	D.	mineral matter

117.

Bio-chemical oxygen demand (B.O.D.) of safe drinking water must be

A.	0	B.	10
C.	50	D.	100

118.

The pocess of excluding large sized particles from water with the help of screens is called filteration.

Yes

119.

The method adopted for removing, bushes branches, debries etc. from water is known as

A.	sedimentation	B.	coagulation
C.	screening	D.	filteration

120.

In the process of screening, the screens should be inclined at an angle of

A.	10? to 20?	B.	30? to 40?
C.	45? to 60?	D.	70? to 85?