Wastewater Story MCQs Class 7
Wastewater Story – MCQs
Class: 7 |
Subject: Science |
Section: 15 – Natural Resources |
Topic: Wastewater Story
CBSE Board Examination – NCERT Concept Based Objective Questions
1. Wastewater is water that:
Answer: B
Wastewater contains impurities from homes, industries, and agriculture.
Wastewater contains impurities from homes, industries, and agriculture.
2. Wastewater from homes is called:
Answer: A
Sewage includes water from kitchens, bathrooms, and toilets.
Sewage includes water from kitchens, bathrooms, and toilets.
3. Sewage contains:
Answer: D
It carries many pollutants and microorganisms.
It carries many pollutants and microorganisms.
4. Treatment of wastewater is done in:
Answer: A
STPs clean wastewater before release or reuse.
STPs clean wastewater before release or reuse.
5. First step in sewage treatment:
Answer: B
Large objects are removed using screens.
Large objects are removed using screens.
6. Microorganisms help by:
Answer: B
Bacteria break down organic matter.
Bacteria break down organic matter.
7. Treated water can be used for:
Answer: D
Recycling reduces freshwater demand.
Recycling reduces freshwater demand.
8. Sludge is:
Answer: B
It is separated during treatment.
It is separated during treatment.
9. Open drains are harmful because:
Answer: D
They create health hazards.
They create health hazards.
10. Proper sanitation prevents:
Answer: D
Safe disposal protects health.
Safe disposal protects health.
11. Bar screens remove:
Answer: B
Large solids are filtered first.
Large solids are filtered first.
12. Aeration means:
Answer: B
Air helps bacteria decompose waste faster.
Air helps bacteria decompose waste faster.
13. Untreated sewage in rivers causes:
Answer: D
It harms aquatic life and humans.
It harms aquatic life and humans.
14. Biogas can be produced from:
Answer: A
Organic sludge decomposes anaerobically.
Organic sludge decomposes anaerobically.
15. Chlorination kills:
Answer: B
Chlorine disinfects treated water.
Chlorine disinfects treated water.
16. Sewer pipes carry:
Answer: B
They transport wastewater to treatment plants.
They transport wastewater to treatment plants.
17. Wastewater management protects:
Answer: D
It ensures sustainable sanitation.
It ensures sustainable sanitation.
18. Oil and grease should not be poured into drains because:
Answer: D
They clog systems and hinder treatment.
They clog systems and hinder treatment.
19. Sanitation refers to:
Answer: D
It ensures safe living conditions.
It ensures safe living conditions.
20. Best practice to reduce sewage:
Answer: B
Responsible usage reduces wastewater load.
Responsible usage reduces wastewater load.