| Which of the Indian Standard series deals with the ‘Methods of sampling and test (physical and chemical) for water and wastewater’. |
A) IS 1622
B) IS 3025
C) IS 11255
D) IS 5182
| Water is said to have one degree of hardness when its soap destroying power is equivalent to the effect of _____ of calcium carbonate in one litre of water |
A) 1 mg
B) 10 mg
C) 14.25 mg
D) 17.15 mg
| The maximum Biological Oxygen Demand of a glucose solution of 100 mg/l will be |
A) 192 mg/l
B) 107 mg/l
C) 100 mg/l
D) 32 mg/l
| The Total Dissolved Solids (TDS) of the Swimming pool should not exceed |
A) 500 mg/L
B) 1500 mg/L
C) 750 mg/L
D) 2000 mg/L
| In drinking water, the amount of free ammonia should not exceed |
A) 0.15 mg/l
B) 0.30 mg/l
C) 0.50 mg/l
D) 1.00 mg/l
| The commonly used indicator for measuring iron concentration in water is |
A) Erichrome Black T
B) 1, 10 phenanthroline
C) phenolphthalein
D) blue litmus
| The Flavor Threshold Number (FTN) and Threshold Odour Number (TON) for the drinking water should not exceed |
A) 3
B) 4
C) 5
D) 6
| In the first stage of decomposition of organic matter in sewage |
A) nitrates are formed
B) nitrities are formed
C) ammonia is formed
D) hydrogen di sulphide is formed
| Turbidity is measured on |
A) standard silica scale
B) standard cobalt scale
C) standard platinum scale
D) platinum-cobalt scale
| Theoretical oxygen requirement for the oxidation of one gram of cell (biomass) is |
A) 1.02 g
B) 1.22 g
C) 1.42 g
D) 1.62 g
