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The pH value of potable water should be between____________________?
Related MCQs
Which of the following plants does not emit appreciable amount of SO2 in atmosphere ?
Biological oxidation ponds remove organic matters present in the polluted water by __________?
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Presence of nitrates in water in excess of 50 ppm causes__________?
Which is the most efficient dust removal equipment for removal of submicronic dust particles from blast furnace gas ?
Pick out the wrong statement ?
Ethanolamine is an absorbent used for the removal of __________ from air/gas?
Threshold limit value (TLV) of CO in air is __________ ppm?
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Which of the following is the most widely used disinfectant in water treatment ?
Which of the following is not a natural source of air pollution ?
Removal of __________ results from the disinfection of water?
A standard test for determination of hardness in water is termed as __________ test?
The function of skimming tank in sewage treatment is to remove __________ substances?
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Which of the following is a manmade source of air pollution ?
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__________ content of the phosphate rock is the pollutant of primary interest in a phosphatic fertiliser plant ?
Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by __________?
Ringelmann chart No. 2 corresponds to __________ percent black smoke?
Global warming may result in __________?
Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of__________?
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High noise levels produced during operation of fans and compressors can be reduced by using__________?
Salt content in sea water is about __________ percent?
__________ is the process of killing organism in water ?
Fresh sewage is __________ in nature?
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Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is __________ micro gram (μ g)/litre?
Which of the following fine dust removal equipments is the most efficient ?
Noise level in a quiet private business office is about __________ decibels?
Which of the following is not a weightless pollutant ?
Noise pollution level in a chemical plant is expressed in __________?
Smog is __________?
Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in ‘gas chamber’ is about __________ ppm?
For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than __________ ppm?
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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 ?
The pH value of potable water should be between____________________?
A. 1 to 1.5
B. 6.5 to 8
C. 13 to 14
D. 4 to 5
Correct Answer:
6.5 to 8
✔
Last Updated:
March 11, 2019