Home→ Chemical Environmental Engineering →For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than ______________ ppm?

Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate ?
The term Biological Oxygen Demand (BOD) is used in relation to __________?
The upper layer of atmosphere is called the __________?
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 ozone?
The average thickness of ozone layer in stratosphere is about __________ dobson unit (DU)?
Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about __________ decibels?
Disinfection of water is done to remove __________?
In water treatment plant, zeolite process is used to remove the __________ of water?
On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because __________?
There are thirteen metals which are treated as pollutants. Which of the following metals is not a pollutant ?

For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than ______________ ppm?

A. 10000
B. 5
C. 500
D. 1000

Correct Answer: 5 ✔

Last Updated: March 11, 2019