Which of the following is the most major constituents of air pollutants ?
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
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 silencersB. Green house gases C. Vibration damg D. Tree plantation
Fluorosis (a bone disease) is caused by the presence of high concentration of ____________ in atmospheric air? A. HydrocarbonsB. Hydrogen fluoride C. Hydrogen sulphides D. Nitrogen dioxide
Death may occur, when SO2 concentration in atmospheric air exceeds ______________ ppm? A. 20 B. 100C. 400 D. 200
Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about ______________ decibels? A. 90B. 120 C. 150 D. 180
Most of the atmospheric air pollutants are present in large quantity in__________________? A. Stratosphere B. ThermosphereC. Troposphere D. Mesosphere
____________ is removed from water by lime-soda process? A. Foul smell and taste B. Iron and manganeseC. 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. ThermosphereB. Stratosphere C. Troposphere D. Mesosphere
Which of the following is the most detrimental for water used in high pressure boiler ? A. Silica B. Turbidity C. Phenol D. Dissolved oxygen
Septic tanks are used for the ______________ of the deposited solids? A. SeparationB. Anaerobic decomposition C. Aerobic decomposition D. None of these