The length of rectangular sedimentation tank should not be more than(Where ‘B’ is the width of the tank) 8B 2B 4B B TRUE ANSWER : ? YOUR ANSWER : ?
Presence of high concentration of ozone and smog in atmospheric air causes the Cracking of rubber products Damage of electrical insulator on high tension power line Fading of dye on textiles Embrittlement & decrease of folding resistance of paper TRUE ANSWER : ? YOUR ANSWER : ?
Black smoke coming out of the chimney of a furnace is an indication of the use of __________ in the furnace. Large quantity of excess combustion air Pulverised coal as fuel Low amount of excess combustion air Hydrocarbon fuel TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is not an air pollutant? Pesticides Ozone Metallic powders Carcinogens TRUE ANSWER : ? YOUR ANSWER : ?
Most of the atmospheric air pollutants are present in large quantity in Stratosphere Trophosphere Thermosphere Mesosphere TRUE ANSWER : ? YOUR ANSWER : ?
Hardy cross method of analysis of distribution system(i) Involves successive trials(ii) Takes economic aspects into account(iii) Is time consuming Only (i) (i) and (ii) (i) and (iii) All are correct TRUE ANSWER : ? YOUR ANSWER : ?
Presence of a certain minimum quantity of flourine is desirable in potable water to prevent Scale formation Dental cavities Corrosion Water-borne disease TRUE ANSWER : ? YOUR ANSWER : ?
Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm). Highly Moderately Extremely Very extremely 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 : ?
Which of the following is a manmade source of air pollution? Automobile exhaust All of these Forest fire Bacterial action in soil and swamp areas TRUE ANSWER : ? YOUR ANSWER : ?