Environmental Engineering in CE MCQs
Practice free Environmental Engineering in CE multiple-choice questions with instant answer feedback and step-by-step solutions. Click an option to check yourself, reveal the full explanation, and work through all 307 questions — no login required.
Question 73hard
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.
Question 74hard
Acute danger to human life (i.e. death) exists, if the concentration of CO2 in atmospheric air exceeds __________ percent (by volume).
Question 75hard
Reingleman chart No. 2 corresponds to __________ percent black smoke.
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Question 76hard
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)
Question 77hard
Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.
Question 78hard
Maximum permissible limit of mercury in human blood is __________ micrograms/100 c.c.
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Question 79medium
5-200 μm size particles are called
Question 80hard
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
Question 81hard
Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm).