Which of the following is not a natural source of air pollution? Biological decay of vegetable matter Volcanic eruptions and lightening discharges None of these Photochemical oxidation of organic matter TRUE ANSWER : ? YOUR ANSWER : ?
Which is a secondary air pollutant? Sulphur dioxide Dust particles Photochemical smog Nitrogen dioxide TRUE ANSWER : ? YOUR ANSWER : ?
Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan Both A & B Neither A nor B With greater number of blades Of increased diameter TRUE ANSWER : ? YOUR ANSWER : ?
As per the world health organisation (WHO) specification, the maximum permissible concentration (i.e., TLV) of particulate matter in air is __________ μg/m³.(μg-microgram) 90 10 750 800 TRUE ANSWER : ? YOUR ANSWER : ?
Thermal pollution due to excessive heat & temperature in the working place causes Fatigue High breathing rate Reduction in working efficiency of manpower All of these TRUE ANSWER : ? YOUR ANSWER : ?
Pick out the one which is not a chemical coagulant. Aluminium sulphate Chloramine Hydrated lime Ferrous sulphate TRUE ANSWER : ? YOUR ANSWER : ?
The permissible color for domestic water supply is __________ ppm. 100 1 20 1000 TRUE ANSWER : ? YOUR ANSWER : ?
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 Chlorination None of these Treating in biological oxygen pond Chemical coagulation TRUE ANSWER : ? YOUR ANSWER : ?
CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing __________ molecules of ozones. 10¹⁵ 10⁵ 10⁹ 10² TRUE ANSWER : ? YOUR ANSWER : ?
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. 90 105 120 60 TRUE ANSWER : ? YOUR ANSWER : ?