Purification of Water Quiz - CBSE Class 4 Science

Free practice quiz: Purification of Water (CBSE Class 4 Science). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 4 Science practice quiz has 20 multiple-choice questions on Purification of Water, and 20 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. What is the main purpose of purifying water?

   1. To change its color
   2. To make it safe to drink
   3. To add taste
   4. To increase its temperature
   Show answer

   Answer: B. To make it safe to drink

   The main purpose of purifying water is to remove contaminants and make it safe for human consumption.

2. What are sediments in water?

   1. Tiny rocks and dirt
   2. Gas bubbles
   3. Light
   4. Hot water
   Show answer

   Answer: A. Tiny rocks and dirt

   Sediments are particles like tiny rocks and dirt that settle at the bottom of water bodies.

3. Why is it important to purify drinking water?

   1. To make it pretty
   2. To remove harmful substances
   3. To make it heavier
   4. To increase cost
   Show answer

   Answer: B. To remove harmful substances

   Purifying drinking water is essential to remove harmful substances that can cause illness.

4. What does UV purification do to water?

   1. Adds color
   2. Removes toxins
   3. Kills pathogens using UV light
   4. Increases salt content
   Show answer

   Answer: C. Kills pathogens using UV light

   UV purification uses ultraviolet light to kill pathogens in water, making it safe to drink.

5. Which of the following is a challenge in water purification?

   1. Availability of water
   2. Availability of air
   3. Availability of sunlight
   4. Availability of soil
   Show answer

   Answer: A. Availability of water

   A major challenge is the availability of clean water sources to be purified for human consumption.

More questions in this quiz

Answers and explanations are in the full quiz.

1. Which method is commonly used for purifying water?
2. What is filtration in water purification?
3. Which of the following is an effective way to kill bacteria in water?
4. Which method helps in removing sediments from water?
5. How does boiling water purify it?
6. What is the role of activated carbon in water purification?
7. What can happen if we drink unpurified water?
8. What is desalination?
9. Which of the following can be used to purify water from heavy metals?
10. Why is water treated before distributing to homes?
11. Which technique is most effective for purifying large amounts of water?
12. What materials can be used in a homemade water filter?
13. How does climate change affect water purification?
14. How can individuals help in the water purification process at home?
15. What is the primary consequence of not treating water before drinking?

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