Tag: pollution of water

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Questions Related to pollution of water

Multiple choice chemistry water too little to waste pollution of water water pollution planet earth

High biological oxygen demand indicates:  

  1. the absence of microbial pollution

  2. moderate microbial pollution

  3. the intense level of microbial pollution

  4. all of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Biological Oxygen Demand (BOD) refers to the amount of dissolved oxygen that aerobic organisms need in order to break down organic material in water over time. Its high value indicates the intense level of microbial pollution.

Multiple choice chemistry water too little to waste pollution of water water pollution planet earth

Which of the following pollutants cannot be degraded by natural process?

  1. DDT

  2. Nuclear Waste

  3. Heavy Metals

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Pollutants which are slowly degradable remain in the environment in an unchanged form for many decades. For example, substances such as dichlorodiphenyltrichloroethane (DDT), plastic materials, heavy metals, many chemicals, and nuclear wastes etc., once released into the environment are difficult to remove. These pollutants cannot be degraded by natural processes and are harmful to living organisms. In the process of environmental pollution, pollutants originate from a source and get transported by air or water or are dumped into the soil by human beings.

Multiple choice chemistry water too little to waste pollution of water water pollution planet earth

Water is becoming scarce due to increase in :

  1. population

  2. industries

  3. agricultural activities

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Water scarcity is a multifaceted issue driven by population growth, industrial expansion, and intensive agricultural practices, all of which increase the demand for limited freshwater resources.

Multiple choice chemistry water too little to waste pollution of water water pollution planet earth

Which of the following industries may be a reason for water scarcity?

  1. Chemical industry

  2. Pharmaceutical industry

  3. Textile industry

  4. All of the above.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

All these industries cause water pollution by the water discharged into the rivers. The common industrial pollutants are sulphur, asbestos, poisonous solvents, poly-chlorinated biphenyl, lead, mercury, volatile organic chemicals, etc.

Multiple choice chemistry water too little to waste pollution of water water pollution planet earth

Pollution of water due to agricultural operations can be minimized by using:

  1. pesticides

  2. fertilizers

  3. all of the above

  4. none of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Pesticides and fertilizers containing chemicals causes water pollution. Pesticides contaminate water as the pesticides are toxic. Fertilizers contain nitrogen and phosphorous, high amount of which is injurious to the underwater organisms. Therefore, the answer is D.

Multiple choice chemistry water too little to waste pollution of water water pollution planet earth

Choose the correct statement(s).

  1. Aldrin is used as a pesticide.

  2. The maximum permissible limit of nitrate in water is 50 ppm.

  3. The maximum permissible limit of fluoride is 6 ppm.

  4. All of the above
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

A) Aldrin is a pesticide used to control soil insects such as termites, corn rootworm, wireworms, rice water weevil and grasshoppers.
B) The maximum permissible limits for nitrite and nitrate are 10 ppm and 50 ppm respectively.
C) The maximum permissible limit of fluoride is 2 ppm.