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