Direct reaction of unsaturated hydrocarbons with either NO or NO2 produces an eye irritating pollutant compound known as________________?
(A) Photochemical smog
(B) Peroxyacetyl nitrate (PAN) or methyl nitrite
(C) Benzopyrene
(D) Polyacrylonitrile
Maximum allowable concentration of CO2 in air for safe working is _____________ ppm (parts per million)?
(A) 50
(B) 1000
(C) 2000
(D) 5000
____________ substances present in sewage are removed in grit chamber during sewage treatment?
(A) Organic
(B) Fatty
(C) Inorganic
(D) Dissolved
Industrial workers working in leather tanning & manufacturing units are prone to suffer from ___________________?
(A) Respiratory ailments (e.g. bronchitis)
(B) Skin diseases (e.g. dermatitis)
(C) Silicosis
(D) Blurred vision
Phenolic water generated in coke ovens & by-product plant attached to an integrated steel plant containing phenol in concentration of less than 100 mg/litre can be removed by_______________?
(A) Chlorination
(B) Treating in biological oxygen pond
(C) Chemical coagulation
(D) None of these
Ionisation potential employed in the industrial electrostatic precipitator is of the order of_______________?
(A) 30 to 70 kV DC
(B) 30 to 70 kV AC
(C) 230 V AC
(D) 230 V DC
Noise level during normal conversation among men is about ______________ decibels?
(A) 10
(B) 45
(C) 90
(D) 115
Exposure to small amount of ______________ results in high blood pressure & heart disease in human beings?
(A) Hydrogen sulphide
(B) Mercury
(C) Cadmium
(D) Asbestos
Which of the following acts as a natural source of air pollution ?
(A) Forest fire
(B) Deforestation
(C) Volcanic eruption
(D) None of these