Environmental Engineering In Ce — Part 2 MCQs with Explanations

Disinfection is the correct answer to “__________ is the process of killing organism in water.”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

Saprophytic is the correct answer to “Most of the bacteria in sewage are”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

Fluorine is the correct answer to “__________ content of the phosphate rock is the pollutant of primary interest in a phos-phatic fertiliser plant.”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

Decreases is the correct answer to “The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated.”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

3000 (i.e. 0.3%) is the correct answer to “If carbon monoxide content in atmospheric air exceeds __________ ppm, death is bound to occur.”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

All of the above is the correct answer to “Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

2 to 4 is the correct answer to “In a sedimentation tank, the detention period for water ranges from __________ hours.”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

4 to 5 is the correct answer to “In sewage treatment, the detention period allowed for oxidation ponds ranges from __________ weeks.”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

Limestone powder or alkalised alumina is the correct answer to “Which of the following is an adsorbant used for the removal of SO 2 from gas/air”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

Oil & fatty is the correct answer to “The function of skimming tank in sewage treatment is to remove __________ substances.”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

All of the above is the correct answer to “Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air's water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

5 is the correct answer to “Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO 2 in air is __________ ppm.”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

Lime is the correct answer to “In sewage treatment, its sedimentation is speeded up by commonly adding”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

Stratosphere is the correct answer to “Atmospheric pollution caused by the exhaust gas of supresonic transport air-crafts is mostly in the atmospheric region called”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

95 is the correct answer to “Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about __________ decibels.”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

MIC (methyl iso-cynate) is the correct answer to “Out of the following, TLV of __________ is the minimum (about 0.02 ppm).”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

Reduce SO2 content in is the correct answer to “Limestone powder is injected during pulverised coal burning in boilers to __________ the flue gases.”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

120 is the correct answer to “Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about __________ decibels.”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

135 is the correct answer to “Noise level audible to audience sitting in the 5 th row from the stage during a large orchestra show corresponds to about __________ decibels.”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

It forms carboxyhaemoglobin by combining with haemoglobin of blood, thereby making it incapable of absorbing oxygen is the correct answer to “On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

Dust catcher (gravity type) is the correct answer to “Which of the following dust collection equipments is the least efficient (for sub-micronic particles)”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

Automobile exhaust is the correct answer to “Peroxyacyl nitrate (PAN), a pollutant is found in the”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

Coagulation is the correct answer to “In water treatment, alum [Al 2 (SO 4 ) 3 ] is used for the process of”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

Carbon dioxide is the correct answer to “Out of the following, TLV of __________ is maximum (about 500 ppm).”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

Both B and C is the correct answer to “During sewage treatment, the sewage is subjected to __________ treatment in Imhoff tank.”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

Detritus tank is the correct answer to “Fine grit present in sewage is removed in the __________ during sewage treatment.”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

Anaerobic decomposition is the correct answer to “Septic tanks are used for the __________ of the deposited solids.”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

70 is the correct answer to “Average human body contains about __________ percent water by weight.”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

5000 is the correct answer to “Maximum allowable concentration of CO 2 in air for safe working is __________ ppm (parts per million).”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

0.2 is the correct answer to “Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about __________ ppm (parts per million).”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

42 is the correct answer to “Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is __________ micro gram (μ g)/litre.”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

105 is the correct answer to “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.”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

20 is the correct answer to “Acute danger to human life (i.e. death) exists, if the concentration of CO 2 in atmospheric air exceeds __________ percent (by volume).”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

40 is the correct answer to “Reingleman chart No. 2 corresponds to __________ percent black smoke.”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

90 is the correct answer to “As per the world health organisation (WHO) specification, the maximum permissible concentration (i.e., TLV) of particulate matter in air is __________ μg/m 3 .(μg-microgram)”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

Hydrogen flouride is the correct answer to “Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

7 is the correct answer to “Maximum permissible limit of mercury in human blood is __________ micrograms/100 c.c.”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

Colloids or aerosols is the correct answer to “5-200 μm size particles are called”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

Treating in biological oxygen pond is the correct answer to “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”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.

Moderately is the correct answer to “Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm).”. This question is standard in competitive examination syllabi for Environmental Engineering In Ce.