Wastewater Story Practice Questions
Class 7 · Science · 1201 free MCQs with instant results and detailed explanations.
1201
Total
369
Easy
609
Medium
223
Hard
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Topics in Wastewater Story
Sewage Treatment
411
Sanitation
390
Water Treatment
400
Sample Questions from Wastewater Story
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What is the primary purpose of sewage treatment?
A.
To remove harmful substances from wastewater
B.
To increase the temperature of wastewater
C.
To add nutrients to the wastewater
D.
To change the color of the wastewater
Show Answer & Explanation
Correct Answer: A
The main goal of sewage treatment is to eliminate pollutants and harmful substances from wastewater before it is released back into the environment.
Q2
Easy
What is the primary purpose of sewage treatment?
A.
To remove harmful substances from wastewater
B.
To increase water temperature
C.
To add chemicals to water
D.
To collect rainwater
Show Answer & Explanation
Correct Answer: A
The main aim of sewage treatment is to eliminate harmful pathogens and pollutants from wastewater before it is released back into the environment.
Q3
Easy
Which of the following is NOT a common method of sewage treatment?
A.
Biological treatment
B.
Chemical treatment
C.
Thermal treatment
D.
Electrical treatment
Show Answer & Explanation
Correct Answer: D
Electrical treatment is not a recognized method for sewage treatment. The common methods are biological, chemical, and thermal treatments.
Q4
Medium
What is the primary purpose of sewage treatment?
A.
To purify wastewater
B.
To collect rainwater
C.
To treat solid waste
D.
To generate electricity
Show Answer & Explanation
Correct Answer: A
The main goal of sewage treatment is to remove contaminants from wastewater, making it safe to return to the environment.
Q5
Medium
Which of the following processes is NOT part of wastewater treatment?
A.
Sedimentation
B.
Filtration
C.
Incineration
D.
Aeration
Show Answer & Explanation
Correct Answer: C
Incineration is a process for waste disposal, not typically used in the treatment of wastewater.
Q6
Medium
What is the role of bacteria in sewage treatment?
A.
To decompose organic matter
B.
To filter out solid waste
C.
To add nutrients to water
D.
To produce toxins
Show Answer & Explanation
Correct Answer: A
Bacteria break down organic matter in sewage, aiding the purification process.
Q7
Medium
Which stage of sewage treatment involves the removal of larger solids?
A.
Primary treatment
B.
Secondary treatment
C.
Tertiary treatment
D.
Final disposal
Show Answer & Explanation
Correct Answer: A
Primary treatment focuses on the physical removal of large solids from wastewater.
Q8
Hard
What is the primary purpose of sewage treatment plants?
A.
To convert sewage into drinking water
B.
To remove harmful substances and pathogens
C.
To dispose of solid waste in landfills
D.
To generate electricity from waste
Show Answer & Explanation
Correct Answer: B
Sewage treatment plants are designed to remove contaminants and pathogens from wastewater, making it safe for release into the environment.
Q9
Hard
During the treatment of sewage, which of the following is primarily used to remove soluble organic matter?
A.
Chlorination
B.
Aeration
C.
Sedimentation
D.
Filtration
Show Answer & Explanation
Correct Answer: B
Aeration introduces air into the wastewater, promoting microbial activity that helps decompose soluble organic matter.
Q10
Hard
What is the main environmental benefit of treating sewage before it is discharged into water bodies?
A.
It increases water temperature.
B.
It promotes the growth of algae.
C.
It minimizes pollution and protects aquatic life.
D.
It adds more nutrients to the water.
Show Answer & Explanation
Correct Answer: C
Treating sewage reduces pollutants, thus protecting aquatic ecosystems and maintaining water quality.
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Wastewater Story — Class 7 Science Practice Questions Online
This page contains 1201 practice MCQs for the chapter Wastewater Story in Class 7 Science. The questions are organized by difficulty — 369 easy, 609 medium, 223 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 3 topics, giving you comprehensive coverage of the entire chapter.