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71.

The colour of water is expressed in numbers of a

A.	silica scale	B.	platinum cobalt scale
C.	pO value	D.	none of these

72.

The odour of water can be determined by

A.	thermometer	B.	Osmoscope
C.	Jackson's turbidimeter	D.	none of these

73.

The odour of water does not change with the temperature.

Agree

Disagree

74.

The commercial osmoscope is graduated with pO values from

A.	0 to 5	B.	5 to 10
C.	10 to 15	D.	15 to 20

75.

When the pO value of water is 5, then it has

A.	no perceptible odour	B.	distinct odour
C.	faint odour	D.	extremely strong odour

76.

The maximum permissible temperature for domestic supply is

A.	5 to 10?C	B.	10 to 15?C
C.	15 to 20?C	D.	20 to 25?C

77.

The maximum permissible colour for domestic supplies, on platinum cobalt scale is

A.	5 to 10 ppm	B.	10 to 20 ppm
C.	20 to 30 ppm	D.	30 to 40 ppm

78.

Odours and tastes may result due to the prsence of

A.	micro-organisms either dead or alive	B.	dissolved gases such as oxygen, carbon dioxide, methane etc.
C.	mineral substances such as sodium chloride, iron compounds etc.	D.	all of the above

79.

The maximum permissible turbidity for domestic supplies, on silica scale is

A.	5 to 10 ppm	B.	10 to 20 ppm
C.	20 to 30 ppm	D.	30 to 40 ppm

80.

High turbidity of water can be determined by

A.	turbidity tube	B.	Jacksons turbidimeter
C.	Baylis turbidimeter	D.	Hellipe turbidimeter