Moist atmospheric air at high temperature (e.g., in summer) having high concentration of sulphur dioxide causes________________?
(A) Fading of dyes on textiles
(B) Corrosion, tarnishing & soiling of metals
(C) Reduced strength of textiles
(D) All
Tri-sodium phosphate is used in boiler water treatment to reduce____________________?
(A) Turbidity
(B) Caustic embrittlement
(C) Suspended silica
(D) Dissolved oxygen
Which of the following is the most major constituents of air pollutants ?
(A) Oxides of sulphur
(B) Oxides of nitrogen
(C) Carbon monoxide
(D) Hydrogen sulphide
______________ cannot control the noise pollution ?
(A) Use of silencers
(B) Green house gases
(C) Vibration damping
(D) Tree plantation
Fluorosis (a bone disease) is caused by the presence of high concentration of ____________ in atmospheric air?
(A) Hydrocarbons
(B) Hydrogen fluoride
(C) Hydrogen sulphides
(D) Nitrogen dioxide
Death may occur, when SO2 concentration in atmospheric air exceeds ______________ ppm?
(A) 20
(B) 100
(C) 400
(D) 200
Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about ______________ decibels?
(A) 90
(B) 120
(C) 150
(D) 180
Most of the atmospheric air pollutants are present in large quantity in__________________?
(A) Stratosphere
(B) Thermosphere
(C) Troposphere
(D) Mesosphere
____________ is removed from water by lime-soda process?
(A) Foul smell and taste
(B) Iron and manganese
(C) Temporary hardness
(D) Permanent hardness
Atmospheric pollution caused by the exhaust gas of supersonic transport air-crafts is mostly in the atmospheric region called________________?
(A) Thermosphere
(B) Stratosphere
(C) Troposphere
(D) Mesosphere