Question Paper

Which of these is NOT a form in which water exists? a) Solid b) Liquid c) Plasma d) Gas

What is the process called when a liquid changes into vapour (gas) upon heating? a) Condensation b) Precipitation c) Evaporation d) Collection

Which of these is an example of an insoluble impurity in water? a) Salt b) Sugar c) Germs d) Sand

Which of the following is a waterborne disease mentioned in the chapter? a) Flu b) Measles c) Cholera d) Chickenpox

What percentage of the Earth’s surface is covered with water? a) 50 percent b) 71 percent c) 90 percent d) 25 percent

Water is known as a _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ solvent because it can dissolve many substances.

When water vapour in the air cools down, tiny water droplets combine to form _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

The continuous circulation of water through evaporation, condensation, and precipitation is known as the _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _is a place where water is purified and made drinkable before being supplied to homes.

Water must be boiled for at least _ _ _ _ _ _ _ _ _ _ _ _ _ _ _minutes to make it safe for drinking.

The process of purifying drinking water with chlorine tablets is called _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

We can live without water. (True/False)

The rate of evaporation decreases when we boil a liquid. (True/False)

Impurities that dissolve in water can be seen easily. (True/False)

Rainwater harvesting is the collection and storage of rainwater for future use. (True/False)

Potable water is water that is not fit for drinking. (True/False)

List two purposes for which we use water in our daily lives.

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What are germs, and why are they dangerous in drinking water?

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Why is it important to conserve water? Give one reason.

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What is the easiest method to purify water at home to kill germs?

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The image below illustrates the path of water in nature.

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Based on the diagram, explain what happens during “precipitation.”

What is the source of energy that causes “evaporation” in this cycle?

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Differentiate between Evaporation and Condensation.

Evaporation:

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Condensation:

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Differentiate between Insoluble Impurities and Soluble Impurities.

Insoluble Impurities:

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Soluble Impurities:

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Describe three different methods you can use to purify water at home to make it safe for drinking.

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Imagine you take a cold glass of juice out of the refrigerator and place it on a table. After some time, you notice tiny water droplets forming on the outer surface of the glass. Explain why these water droplets formed.

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Chapter: 09. Water As A Resource

Section A: Multiple Choice Questions (Choose the correct option)

Section B: Fill in the Blanks

Section C: True or False

Section D: Short Answer Questions

Section E: Diagram-Based Question

Section F: Identify and Differentiate

Section G: Long Answer Question

Section H: Observation-Based Question