CHEM QUIZ 2023

1. Which of the following is a waterborne disease?

• Typhoid

• Cholera

• Diarrhoea

• All of the above

What is the full form of BOD?

• Biological Ozone Demand

• Biological Oxygen Demand

• Biotic Oxygen Demand

• Biological Oxygen Deficiency

The main cause of water pollution is

• Soap

• Industrial effluents

• Smoke

• Ammonia

Minamata disease is a pollution related disease resulting from

• Oil spills

• Arsenic

• Mercury

• organic waste

The excessive discharge of fertilizers into the water bodies results in

• Growth of fish

• Death of hydrophytes

• Eutrophication

• Silt

Increase in contraction of the toxicant at successive tropic level is known as

• Biomagnification

• Biotransformation

• Biogeochemical cycling

• Biodegradation

Blue baby syndrome is caused due to excess of

• Nitrate

• Carbon dioxide

• Iron

• Zinc

In which process, the fluoride content of water is raised?

• Chlorination

• Fluoridation

• Defluoridation

• Reverse Osmosis

End point colour in Mohr method is

• Reddish brown colour

• Blue colour

• Yellow colour

• Black colour

The indicator used in the Mohr method is

• Fe³⁺

• Fluorescein

• Potassium chromate

• Eosin