CBSE Class 3 EVS How We Get Water Worksheet

CBSE Class 3 EVS Practice Worksheets (100)-How We Get Water

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I. Fill in the blanks:

Question 1. We clean water in the storage tanks by ................................ and adding ............. to kill germs.
Answer: filtering, chlorine
In simple words: We make water clean by filtering out dirt and adding chlorine to kill tiny bugs.

Exam Tip: Remember that chlorine is the chemical used to kill harmful germs in drinking water.

Question 2. Tube wells are used to pump water from ................................
Answer: underground
In simple words: Tube wells help us pull up clean water from deep under the ground.

Exam Tip: Always associate tube wells with pumping water from deep underground layers.

Question 3. The method used to separate solid things mixed in water is called ................................
Answer: filtration
In simple words: Filtration means separating solid dirt from water using a filter.

Exam Tip: Learn the term "filtration" to describe cleaning solids out of liquids.

II. Give reasons:

Question 1. We do not use sea water for household purposes. Why?
Answer: Sea water contains too much salt. This salty water cannot be used for drinking, cooking, or washing clothes at home.
In simple words: Sea water is too salty for us to drink or use for chores.

Exam Tip: Make sure to explain that the high salt content makes sea water unfit for daily chores.

Question 2. Why do we must store drinking water in covered utensils?
Answer: Storing water in covered pots keeps dirt, dust, and insects out. It ensures our drinking water stays clean and safe.
In simple words: Covering our water keeps flies and dirt from falling inside.

Exam Tip: State clearly that covers protect water from insects and airborne dust.

III. Write True or False:

Question 1. Rain water reaches underground through tube wells.
Answer: False
In simple words: This is false because rain water seeps into the soil on its own.

Exam Tip: Rainwater enters the ground by naturally soaking through the soil, not through wells.

Question 2. We should throw garbage into rivers and lakes.
Answer: False
In simple words: This is false because throwing trash in rivers makes the water dirty and unsafe.

Exam Tip: Remember that dumping waste into freshwater bodies is a major cause of water pollution.

Question 3. Ocean water is pure.
Answer: False
In simple words: This is false because ocean water is full of salt and sand.

Exam Tip: Ocean and sea water contains high amounts of salts, so it is not pure or drinkable.

Question 4. From big tanks the water comes to our homes through big pipes.
Answer: True
In simple words: This is true because big pipes bring clean water from water works directly to our taps.

Exam Tip: Remember that water works use massive underground pipes to distribute clean water to city homes.

IV. Identify the picture and complete the sentences:

Question 1. Identify the picture and complete the sentence:

................................ are used to pump water
Answer: Hand pumps
In simple words: The picture shows a hand pump, which we use to draw water from the ground.

Exam Tip: Identify the metal handle and spout to correctly label a hand pump in diagrams.

V. Questions:

Question 1. List down two ways to save water.
Answer: First, we should close the tap while brushing our teeth. Second, we can reuse water used for washing vegetables to water our garden plants.
In simple words: We can turn off running taps and reuse water to keep from wasting it.

Exam Tip: Mention simple, actionable steps like closing taps or using buckets instead of showers to save water.

Question 2. Write down the different ways by which river water get polluted.
Answer: Rivers get dirty when factories dump toxic waste into them. People also pollute rivers by bathing animals, washing dirty clothes, and throwing garbage into the water.
In simple words: Rivers get dirty when people wash clothes, bathe animals, or dump garbage and factory waste in them.

Exam Tip: Focus on human activities like washing, bathing, and industrial dumping when listing water pollutants.