Water Pollution
Chemistry ⇒ Environmental Chemistry
Water Pollution starts at 9 and continues till grade 12.
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See sample questions for grade 10
A river near a city receives untreated sewage and shows a sudden decrease in fish population. What is the most likely cause?
A sample of river water has a high Biological Oxygen Demand (BOD). What does this indicate about the water quality?
Describe the role of wetlands in controlling water pollution.
Describe two ways in which oil spills can harm aquatic life.
Explain how water pollution can impact the economy of a region.
Explain the difference between point source and non-point source water pollution.
A river near a city receives untreated sewage and shows a sudden decrease in fish population. What is the most likely cause?
A sample of river water has a high Biological Oxygen Demand (BOD). What does this indicate about the water quality?
Which of the following diseases is most commonly associated with drinking contaminated water?
(1) Malaria
(2) Cholera
(3) Tuberculosis
(4) Influenza
Which of the following is a biological indicator of water pollution?
(1) pH
(2) Turbidity
(3) Presence of E. coli
(4) Temperature
Which of the following is a chemical pollutant commonly found in water due to agricultural activities?
(1) Nitrates
(2) Mercury
(3) Lead
(4) Oil
Which of the following is a consequence of acid rain on water bodies?
(1) Increased pH
(2) Decreased pH
(3) Increased oxygen content
(4) Decreased temperature
Fill in the blank: The chemical formula for nitrate ion, a common water pollutant, is ________.
Fill in the blank: The excessive growth of algae in water bodies due to nutrient pollution is called ________.
Fill in the blank: The maximum amount of a pollutant that can be present in water without causing harm is called the ________ limit.
Fill in the blank: The presence of ________ in water indicates contamination by human or animal waste.
True or False: Eutrophication is caused by excessive nutrients in water bodies.
True or False: Pesticides in water can accumulate in the tissues of aquatic organisms.
True or False: Thermal pollution increases the oxygen content of water.
True or False: Water pollution can affect the food chain in aquatic ecosystems.
