Arsenic pollutant is not generated in _______________ industries?
(A) Tanneries
(B) Glass & ceramic
(C) Beverages
(D) Any of these
Pollution by particulate matter emission in the atmosphere does not take place during metal____________________?
(A) Grinding
(B) Machining
(C) Cutting
(D) Polishing
Aerosols present in atmospheric air may be__________________?
(A) Positively charged
(B) Negatively charged
(C) Neutral
(D) Combination of all
Noise level inside a jet airliner in normal flight is about ______________ decibels?
(A) 80
(B) 100
(C) 125
(D) 150
A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of _____________ high above earth’s atmosphere, which absorbs it?
(A) Hydrogen
(B) Carbon dioxide
(C) Ozone
(D) None of these
Fluorosis is caused due to the presence of excessive amount of ______________ in drinking water?
(A) Mercury
(B) Lead
(C) Fluoride
(D) Arsenic
Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyll and haemoglobin breakdown of some animals, beyond TLV (>50 ppm) ?
(A) Acts as a green house gas thereby raising earth’s temperature
(B) Causes asphyxia
(C) Causes increase in sea level
(D) Enhances the green house effect
Soluble silica present in boiler feed water can be removed by______________________?
(A) Coagulation
(B) Filtration
(C) Anion exchanger
(D) Preheating it
Maximum permissible limit of mercury in human blood is ______________ micrograms/100 c.c?
(A) 1
(B) 7
(C) 19
(D) 82