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.

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
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   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
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   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
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   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
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   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
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   Answer: A. Availability of water

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

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