Related Questions

Which of the following is the most lethal water pollutant?
ক Phenol and cynide
খ Chlorine
গ Alkalis
ঘ Suspended solids
The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by
ক Biological oxygen pond
খ Aerated lagoons
গ Trickling filters
ঘ Gravity separator having oil skimming devices
Most poisonous pollutant in water is
ক Lead
খ Zinc
গ Phosphate
ঘ Arsenic
The non-biotic pollutant of underground water is
ক Bacteria
খ Algae
গ Arsenic
ঘ Viruses
There are thirteen metals which are treated as pollutants. Which of the following metals is not a pollutant?
ক Mercury
খ Arsenic
গ Aluminium
ঘ Lead
Which of the following is NOT a secondary air pollutant?
ক Aldehydes
খ Nitric oxide
গ Ketones
ঘ Nitrogen dioxide
Which of the following is not a gaseous air pollutant?
ক Ozone
খ Fumes
গ Hydrogen sulphide
ঘ Carbon
Which of the following is not an air pollutant?
ক Ozone
খ Carcinogens
গ Pesticides
ঘ Metallic powders
Which of the following metals is not a pollutant ?
ক Mercury
খ Arsenic
গ Lead
ঘ Aluminium
Which of the following is usually not an air-pollutant?
ক Hydrocarbons
খ Sulphur dioxide
গ Carbon dioxide
ঘ Nitrous oxide

Next steps