The resistance of water to the passage of light through it is a measure of the___________________?
(A) Turbidity
(B) Color
(C) Hardness
(D) Dissolved gases
Polyvinyl chloride containers are not suitable for storing_________________?
(A) Foodstuffs
(B) Woolen clothes
(C) Metallic powder
(D) None of these
The earth’s atmosphere is an envelope of gases present upto a height of about ______________ kms?
(A) 10
(B) 200
(C) 1000
(D) 2000
Which of the following processes is involved in the biochemical treatment of sewage effluents ?
(A) Oxidation
(B) Reduction
(C) Dehydration
(D) Fermentation
The maximum CO2 is emitted into the atmosphere by_________________?
(A) Combustion
(B) Urea
(C) Biomass burning
(D) Trees
Color test of water is done with an instrument called__________________?
(A) Tintometer
(B) Colorimeter
(C) Electro-chemical cell
(D) Turbidimeter
Water filtration rate in a slow sand filter ranges from ____________ litres/m2/hr?
(A) 10 to 20
(B) 100 to 200
(C) 1500 to 2500
(D) 4000 to 5000
A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called___________________?
(A) Cesspool
(B) Lagoon
(C) Skimming mill
(D) Septic tank
The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about ____________ decibels?
(A) 60
(B) 90
(C) 105
(D) 120
Maximum permissible residual chlorine in treated water should be ____________ mg/litre?
(A) 0.001 to 0.01
(B) 0.2 to 0.3
(C) 2 to 3
(D) 5 to 10