1101. The presence of sodium chloride in water :

A. Causes bad tests
B. Soften the water *
C. Increases hardness
D. Stops epidemic

1102. The presence of calcium and magnesium bi-carbonates in water causes hardness in the water :

A. Correct *
B. Incorrect

1103. The sodium carbonate in water :

A. Causes bad taste
B. Softens the water *
C. Increases hardness of water
C. Stop epidemic

1104. The presence of _____ causes red colour in water :

A. Iron *
B. Manganese
C. Sodium Fluoride
D. Calcium carbonate

1105. When manganese is present in water , it reduces the degree of hardness :

A. Yes
B. No *

1106. When lead is present in water it :

A. Changes its colour
B. Causes turbidity
C. Causes Alkalinity
D. None of the above *

1107. The presence of hydrogen sulphide in water causes :

A. Softening
B. Alkalinity
C. Acidity *
D. Bad taste

1108. The presence of carbon dioxide in water causes acidity :

A. True *
B. False

1109. Turbidity is the measure of resistance to the passage of ________ through the water :

A. Light *
B. Air

1110. Turbidity of water is expressed in terms of :

A. Silica scale *
B. Platinum cobalt scale
C. pO value
D. None of the above