4 Sections
16 Lessons
Lifetime

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Unit I: Materials
The chapter from Unit I: Materials is an essential part of the CBSE Class 7 Science curriculum, covering concepts related to everyday substances, their properties, and uses. To strengthen learning, we bring you CBSE Class 7 Science MCQs – Online Practice Test with automatic scoring and per-question feedback. This quiz includes 60 carefully designed questions based strictly on the NCERT syllabus, making it ideal for students preparing for CBSE Class 7 board exam standards. The online practice test allows learners to attempt questions within a fixed time, receive instant results, and review detailed feedback. It is a perfect tool for self-assessment, revision, and boosting confidence for examinations.
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Unit II: The World of the Living
Unit II: The World of the Living introduces students to important life science concepts such as plants, animals, and their interdependence within ecosystems. To make learning engaging and effective, we provide CBSE Class 7 Science MCQs – Online Practice Test with automatic scoring and per-question feedback. This quiz is designed with 60 NCERT-based questions that strictly follow the CBSE syllabus, ensuring relevance for exam preparation. Students can attempt the test in a timed environment, receive instant scoring, and view feedback for every question, which strengthens their conceptual clarity. This practice tool is ideal for CBSE Class 7 board exam standards, helping learners build confidence, enhance retention, and prepare effectively for assessments.
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Unit III: How Things Work
Unit III: How Things Work in the CBSE Class 7 Science curriculum helps students explore the principles of motion, force, energy, and simple machines, making science both practical and engaging. To strengthen understanding, we offer CBSE Class 7 Science MCQs – Online Practice Test with automatic scoring and per-question feedback. This quiz consists of 60 carefully prepared questions aligned strictly with the NCERT syllabus, ensuring relevance for CBSE Class 7 board exam standards. The timed test allows students to attempt questions in a structured format, get instant scoring, and receive detailed feedback for every answer. It serves as an effective self-assessment tool to improve preparation, build confidence, and revise key concepts with accuracy.
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Unit IV: Natural Phenomena
Unit IV: Natural Phenomena in the CBSE Class 7 Science syllabus introduces students to fascinating concepts such as light, reflection, shadows, and other natural occurrences that shape our daily lives. To help learners master these topics, we provide CBSE Class 7 Science MCQs – Online Practice Test with automatic scoring and per-question feedback. This quiz includes 60 NCERT-based multiple-choice questions, designed strictly as per the syllabus, making it ideal for CBSE Class 7 board exam standards. The online test offers a timed practice session, immediate scoring, and detailed feedback for each response, allowing students to identify strengths and areas for improvement. It is a reliable self-assessment and revision tool for exam preparation.
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Chapter 16: Wastewater Story

CBSE Class 7 Science — Chapter 16: Wastewater Story — 60 Qs Timed Quiz

Chapter 16: Wastewater Story

Unit IV: Natural Phenomena — CBSE Class 7 — Subject: Science — CBSE Board Examinations

Highlight: These MCQs are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 7 board exam preparation.

Questions: 60

Duration: 60 minutes

Total Marks: 60 (1 mark each)

Select one option per question.

60:00

1. What is wastewater?

Water that has been used and is contaminated Pure drinking water Rainwater collected in tanks Mineral water

2. Sewage commonly refers to wastewater from:

Only industries Houses and communities (domestic sources) Only rain None of the above

3. If untreated sewage enters rivers it can:

Make water cleaner Increase fish population only Pollute the water and harm life Turn water into fuel

4. Sewage typically contains:

Organic waste, suspended solids and microbes Only pure water Only sand and gravel Only oxygen

5. Discharging untreated sewage into rivers can cause:

More clean water Increase in oxygen levels Immediate evaporation Spread of water-borne diseases

6. What does an STP (sewage treatment plant) do?

Produce more sewage Treat sewage to remove contaminants Convert sewage to oil Store sewage only

7. The first stage in many treatment plants that removes large solids is called:

Disinfection Chemical polishing Primary treatment (screening, sedimentation) Aeration pond

8. Biological treatment of sewage using microbes is called:

Secondary treatment Primary treatment Screening only Filtration only

9. What is the solid material that settles out during sewage treatment called?

Effluent Sludge Influent only Greywater

10. What is the name of treated water that is discharged from a treatment plant?

Sludge Influent Effluent Sewage

11. Greywater usually comes from which household sources?

Toilet flushing only Bath, sink and washing water Rainwater directly Bottled water

12. A simple household system to treat sewage on-site is called:

Septic tank Desalination unit Rainwater harvesting pit Swimming pool

13. Which chemical is commonly used to disinfect treated water?

Sugar Sand Chlorine Salt only

14. Microbes that need oxygen to break down sewage are called:

Anaerobic microbes Aerobic microbes Chemical microbes Non-living microbes

15. Anaerobic decomposition of sludge produces which gas often captured as biogas?

Oxygen Nitrogen Carbon dioxide only Methane (biogas)

16. Which process in a plant removes large solids like plastic and rags?

Chlorination Aeration only Screening Composting

17. A natural, plant-based method to treat wastewater is known as:

Thermal treatment Constructed wetland Chlorination pond Desalination tank

18. Greywater can be safely reused to recharge groundwater by using:

Percolation pits Open burning Mixing with fresh water directly Dumping on roads

19. Separating waste at home into categories before disposal is called:

Mixing Burning Source segregation Dumping

20. Which practice increases risk of water contamination and disease spread?

Using treated water Composting biodegradable waste Proper sewage connection Open defecation

21. One important aim of sewage treatment is to:

Remove harmful organisms and reduce odors Add more pathogens Increase solids only Make water salty

22. Which engineered system houses microbes to treat sewage biologically?

Solar panel Reservoir only Bioreactor (or aeration tank) Toilet cistern

23. Converting kitchen and garden waste into useful manure is called:

Incineration Composting Filtration only Dumping

24. What is the purpose of a manhole in a sewer system?

To provide access for inspection and cleaning To store drinking water To plant trees To mix sewage with fresh water

25. Which system carries wastewater from homes to treatment facilities?

Power grid Road network Internet Sewer network

26. Reusing treated wastewater for irrigation helps to:

Increase freshwater use Conserve freshwater resources Pollute crops always None of the above

27. A high BOD (Biochemical Oxygen Demand) value in water indicates:

High organic pollution Low pollution Very clear water High salt content only

28. Which contaminant from kitchens tends to float and needs skimming?

Sand Dissolved salts Oil and grease Rock fragments

29. Sludge digesters primarily help in:

Increasing sludge volume Stabilizing sludge and producing biogas Converting water to sand Removing oxygen only

30. Which diseases spread through contaminated water and poor sewage disposal?

Cholera and dysentery Chickenpox only Broken bones Common cold only

31. Which simple system uses ponds and sunlight to treat sewage naturally?

Chlorine pool Incinerator Stabilization ponds Cement pit

32. Which action helps keep sewage systems functioning well?

Pouring oil down the drain Not throwing plastics/chemicals down drains Flushing large cloths regularly Dumping batteries in the toilet

33. In septic systems, solids settle down while liquid flows out to:

Soak pits or leach fields Rivers directly Drinking water supply The sky

34. Wastewater from industries often needs special treatment due to:

Being very clean Containing only water Being edible Toxic chemicals and heavy metals

35. To prevent sewage overflow in cities, authorities should:

Abandon maintenance Conduct regular cleaning and maintenance Encourage dumping of waste in drains Close all drains permanently

36. Which filtration method removes fine particles and some bacteria from wastewater?

Burning Shaking only Sand filtration / biofilters Freezing

37. Treated wastewater can be reused for:

Flushing toilets and irrigation Drinking without treatment Filling glass bottles for sale as mineral water Fuel for cars

38. Which household practice protects the sewer system?

Pouring solvents down the sink Disposing chemicals at proper hazardous waste centers Flushing batteries Dumping paint into drains

39. Which toilet design helps reduce water use and separate waste for treatment?

Flush toilets using lots of water Open pits used randomly Eco-san or dry toilets Making holes in rivers

40. Which measure most effectively reduces water-borne disease risk?

Encouraging open defecation Ignoring sewer leaks Dumping waste in rivers Improving sanitation and awareness

41. Which action at home helps sewage systems work better?

Avoid flushing plastics and fix leaks Pour oil and grease into drains Throw medicines into toilets Use drains as trash bins

42. After proper treatment, sewage effluent will have:

Increased pathogens Reduced BOD and pathogens More plastics Higher odor always

43. Which by-product from sewage treatment can be used as fuel?

Pure gasoline Raw sewage Biogas (methane) Mercury

44. To protect waterways, one should avoid disposing of what down sinks?

Medicines and chemicals Vegetable peels only Rainwater only Clean water

45. Sedimentation tanks are used to:

Add solids to sewage Let heavy particles settle down Increase bacteria in water Heat the sewage

46. A sustainable way to manage sludge is to:

Dump it in rivers Burn it in open air Stabilize and convert to compost or biogas Mix with drinking water

47. Proper sewage management protects communities by:

Reducing disease and contamination Increasing open dumping Spreading pathogens intentionally Removing all water sources

48. Why is pre-treatment of industrial wastewater important before sending to municipal plants?

To increase toxicity To remove hazardous chemicals that would harm treatment processes To add more solids To mix with drinking water

49. In areas without sewer networks, a good alternative to improve sanitation is:

Open defecation Dumping waste in water bodies Installing septic systems or community treatment units None of the above

50. Cleaning a polluted river requires:

Reducing pollution sources and treating wastewater Adding more sewage Stopping treatment plants Bringing in seawater

51. How can communities help manage wastewater better?

By ignoring leaks By practicing proper disposal and supporting treatment initiatives By dumping waste everywhere By stopping water use altogether

52. Conserving water at home helps sewage management by:

Increasing treatment loads Creating more sewage instantly Reducing the volume of wastewater to treat Polluting water more

53. Which tiny organisms are essential in treating organic sewage?

Microbes (bacteria and protozoa) Rocks Plastic pieces Metals

54. Untreated sewage in water bodies reduces dissolved oxygen and harms:

Soil only Air quality only Plant roots only Fish and aquatic organisms

55. Stormwater should ideally be collected separately from sewage to:

Mix more pollutants Prevent overloading treatment plants during heavy rains Increase sewage volume unnecessarily Create more sludge always

56. In rural areas without sewers, households commonly use:

Septic tanks and soak pits Large sewage rivers No sanitation at all Direct discharge to lakes

57. Sustainable wastewater management includes:

Only building pipes Technology, policies and public participation Ignoring pollution sources Removing all treatment plants

58. Which parameter is commonly monitored to check treatment effectiveness?

Shoe size Phone number BOD, pH and suspended solids Hair color

59. What basic hygiene practice helps prevent spread of sewage-related diseases?

Regular handwashing with soap Sharing drinking water freely Ignoring toilets Walking barefoot in sewage

60. The best way to protect our water resources is to:

Dump untreated sewage in rivers Use unlimited water and waste it Treat wastewater, prevent pollution and conserve water Stop all sanitation practices

Score: 0 / 60

Time taken: 00:00

Correct: 0

Wrong: 0

Unattempted: 60

Per-question feedback is shown below each question. Correct answers are highlighted after submission.

When time ends the quiz will auto-submit and answers will be shown.

Relevant Titles
CBSE Class 7 Wastewater MCQs — 60-Question Online Practice Test
NCERT-Aligned Chapter 16 Wastewater MCQs with Auto Scoring
Timed Class 7 Science Quiz — Wastewater Story (60 Qs)
Practice Wastewater Chapter: Class 7 MCQs & Instant Feedback
Free Online Wastewater Quiz — CBSE Class 7 MCQs & Explanations
Chapter Overview
Prepare effectively for Chapter 16: Wastewater Story with our CBSE Class 7 Science MCQs Wastewater online practice test. Designed strictly to follow the NCERT syllabus, this timed 60-question quiz provides automatic scoring and clear per-question feedback to strengthen concepts like sewage, treatment processes, sludge management, and sanitation practices. With an on-screen countdown timer, instant score summary, and per-question explanations, learners can practise under exam-like conditions, review errors, and attempt the quiz multiple times to improve. Ideal for classroom assessments, homework and CBSE board exam revision, the interactive format helps students build confidence, track progress across attempts, and consolidate NCERT topics before final exams.
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Chapter 15: Forests: Our Lifeline

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Chapter 16: Wastewater Story

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