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Prepared by: learnloophq@gmail.com

Last edited 25 days ago by Learn LoopHQ.

Answer key

Chapter: 05. Water

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Water Chapter Practice Exam

Instructions: Read each question carefully and answer to the best of your knowledge.

Total Marks: 50 Time Allotted: 60 minutes

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Section A: Multiple Choice Questions (5 Marks)

Choose the best answer for each question.

What percentage of the Earth’s total water is found in seas and oceans? (a) 1% (b) 2% © 70% (d) 97%

Water is made up of which two elements? (a) Carbon and Oxygen (b) Hydrogen and Nitrogen © Hydrogen and Oxygen (d) Nitrogen and Carbon Dioxide

At what temperature does pure water freeze? (a) 100°C (b) 4°C © 0°C (d) -10°C

Which of the following is considered the purest form of water available on Earth? (a) River water (b) Sea water © Rainwater (d) Underground water

Which of these is a water-borne disease? (a) Anaemia (b) Cholera © Flu (d) Cold

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Section B: Fill in the Blanks (5 Marks)

Complete the following sentences with the correct word(s).

The chemical formula of water is _ _ _ _ _ _ _ _ _ _ _ _ _ _.

The process of removing dissolved salts from sea water is called _ _ _ _ _ _ _ _ _ _ _ _ _ _.

Water exists in three states: solid, liquid, and _ _ _ _ _ _ _ _ _ _ _ _ _ _.

A substance that dissolves in another substance to form a solution is called a _ _ _ _ _ _ _ _ _ _ _ _ _ _.

Excessive loss of water from the body due to severe illness is called _ _ _ _ _ _ _ _ _ _ _ _ _ _.

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Section C: True or False (5 Marks)

State whether each statement is True or False.

Water is an element.

Sea water is suitable for drinking purposes.

Ice is lighter than water.

Boiling water for 10-15 minutes helps kill germs.

The solubility of a substance in water generally decreases with an increase in temperature.

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Section D: Short Answer Questions (10 Marks)

Answer each question in 1-2 sentences.

What is potable water?

List two characteristics of pure water.

Name two ways water is useful for plants.

What is the water table?

How can stirring help in dissolving a substance faster in water?

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Section E: Identifying and Differentiating Concepts (6 Marks)

Differentiate between the following pairs.

Saturated Solution vs. Unsaturated Solution

Dew vs. Frost

Flood vs. Drought

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Section F: Diagram-Based Question (4 Marks)

Observe the diagram carefully and answer the questions.

A diagram illustrating various steps involved in the purification of river or lake water for drinking purpose.

{

"image_description": "A flow chart showing a water purification plant. River water enters a sedimentation tank. From there, it goes to a loading tank where alum is added. Then, it flows to a filtration tank with layers of gravel, coarse sand, and fine sand. Next, it moves to a chlorination tank, where chlorine is added. Finally, purified water is stored in a storage tank and supplied to homes.",

"style": "diagram, educational, clear labels",

"elements_to_include": ["river water intake", "sedimentation tank", "loading tank with alum addition", "filtration tank with sand/gravel/charcoal layers", "chlorination tank with chlorine addition", "storage tank", "pipe distributing purified water to homes"],

"keywords_for_ai_generator": ["water treatment plant", "water purification process", "diagram", "filtration", "chlorination", "sedimentation", "water supply"]

}

(a) What is the purpose of adding alum in the loading tank? (b) What happens in the filtration tank?

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Section G: Observation-Based Question (3 Marks)

Read the scenario and answer the question.

You take some tap water in a watch glass and heat it until all the water evaporates. What observation would confirm that tap water contains some dissolved impurities?

What would you observe on the watch glass?

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Section H: Long Answer Questions (12 Marks)

Answer each question in 4-5 sentences.

Explain the water cycle, detailing its key steps and its importance.

Describe the large-scale purification process of water as it happens in a water treatment plant.

Explain the anomalous behavior of water and why it is crucial for aquatic life in cold regions.

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