Out of the following, TLV of __________ is the minimum (about 0.02 ppm). MIC (methyl iso-cynate) Bromine Ozone Phosgene TRUE ANSWER : ? YOUR ANSWER : ?
Inhalation of silica dust by human being during hand drilling in mica mining, lead & zinc mining, silica refractory manufacture and in foundaries causes All of these Tuberculosis Shortness of breath Asphyxiation (suffocation) TRUE ANSWER : ? YOUR ANSWER : ?
Ionisation potential employed in the industrial electrostatic precipitator is of the order of 30 to 70 kV DC 230 V DC 230 V AC 30 to 70 kV AC TRUE ANSWER : ? YOUR ANSWER : ?
Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of Chlorine or its compounds Ozone and iodine All of these Ultraviolet light for irradiation of water TRUE ANSWER : ? YOUR ANSWER : ?
Higher concentration of CO₂ in atmosphere All of these Prevents solar heat being radiated out completely, resulting in Allows visible solar radiation (ultraviolet) of short wave-length to pass through Reflects and absorbs the longer wavelength (infra-red) radiations TRUE ANSWER : ? YOUR ANSWER : ?
Insufficient washing of sand grains in a rapid sand filter causes Expansion of filtering media Mud balls Shrinkage of filtering media Air binding TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur? None of these Thermosphere Troposphere Stratosphere TRUE ANSWER : ? YOUR ANSWER : ?
The weakest sound that can be heard by a person in a quiet environment is equivalent to __________ decibel. 20 1 5 10 TRUE ANSWER : ? YOUR ANSWER : ?
'Pneumoconiosis' is a disease caused by the inhalation of __________ dust. Coal Lime Uranium ore Iron ore TRUE ANSWER : ? YOUR ANSWER : ?
TLV of lead for public sewer/waste water is about __________ ppm. 1 25 650 150 TRUE ANSWER : ? YOUR ANSWER : ?