Class 7 Science

Chapter 18: Wastewater Story

MCQs and Practice Worksheet

Part A: Multiple Choice Questions (MCQs)

Q1. Water used in homes and industries becomes:

A. Clean water
B. Fresh water
C. Wastewater
D. Rainwater

Answer: C

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Q2. Wastewater flowing through drains is called:

A. River water
B. Sewage
C. Drinking water
D. Groundwater

Answer: B

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Q3. Which of the following is NOT present in sewage?

A. Soap and oil
B. Human waste
C. Germs
D. Pure oxygen

Answer: D

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Q4. Sewage must be treated to:

A. Increase pollution
B. Save electricity
C. Prevent diseases and pollution
D. Change colour of water

Answer: C

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Q5. A plant that treats wastewater is called:

A. Water plant
B. Power plant
C. Sewage Treatment Plant
D. Factory

Answer: C

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Q6. Solid waste that settles at the bottom during treatment is called:

A. Sewage
B. Sludge
C. Scum
D. Water vapour

Answer: B

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Q7. Which one is a good sanitation habit?

A. Throwing waste into rivers
B. Open defecation
C. Using toilets
D. Leaving taps open

Answer: C

Part B: Practice Worksheet

1. Fill in the blanks:

• Dirty water after use is called __________.
• Wastewater flowing in drains is called __________.
• Solid waste collected at the bottom is called __________.
• A __________ plant cleans wastewater.

2. Very Short Answer:

(a) What is wastewater?
(b) Name one step of sewage treatment.
(c) Why is sanitation important?

3. Short Answer:

(a) What is sewage?
(b) Why should sewage be treated?
(c) Write two uses of treated water.

4. Long Answer:

Explain the process of wastewater treatment in a sewage treatment plant.

Answer Key (For Teachers & Parents)

Fill in the blanks:

• Wastewater
• Sewage
• Sludge
• Sewage Treatment

Very Short Answers:

• Dirty water after use
• Screening / Sedimentation / Aeration
• To prevent diseases and pollution

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Shaktimatha CBSE Learning
Class 7 Science – Chapter 18: MCQs & Worksheet

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