40 TOP ENVIRONMENTAL ENGINEERING Online Test – Multiple Choice Questions and Answers Posted on March 9, 2024February 3, 2024 by engineer2 Comments 1. Iron & manganese present in the polluted water is removed by chlorination only oxidation followed by settling & filtration chemical coagulation simple filtration 2. Atmospheric pollution caused by the exhaust gas of supresonic transport air-crafts is mostly in the atmospheric region called stratosphere mesosphere thermosphere troposphere 3. A shallow pond in which the sewage is retained and biologically treated is called oxidation lagoon Imhoff tank skimming tank 4. Maximum permissible turbidity in potable water is __________ ppm 1 10 250 1000 5. The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated may increase or decrease ; depends on the chemical characteristics of polluted water increases remains constant decreases 6. Pick out the wrong statement Decomposition of plants containing chlorophyll is a natural source of carbon monoxide in atmosphere Catalytic converter is fitted in automobiles to reduce carbon monoxide concentration in exhaust emissions Inhalation of pollutant carbon monoxide results in death by asphyxiation Sulphur dioxide is the main pollutant emitted from the exhaust of petrol driven automobiles 7. Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of __________ present in it potassium cyanide ortho-xylene coal ash none of these 8. Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools) 1-2 5-10 25-30 35-40 9. Which is the most practical and economical method for removal of suspended solid matter from polluted water ? Skimming off Chlorination Sedimentation Biological oxidation 10. Presence of bacteria in potable (drinking) water causes bad taste & colour bad odour turbidity disease Loading … Question 1 of 10
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its a very good program to get practice and study a required subject knowledge
, all students should be thankful to you….
very good questions