Wastewater Story
14 solved questions from Class 7 Science, each with the full working. Tap any question to see the step-by-step solution.
- 1 What is the fundamental scientific concept introduced in the chapter 'Wastewater Story'? medium MCQ Key Concept & Definition
- 2 Which of the following is an important application or observation related to 'Wastewater Story'? easy MCQ Practical Application
- 3 What primary question does the chapter 'Wastewater Story' aim to answer? medium MCQ Core Scientific Inquiry
- 4 Why is the study of 'Wastewater Story' essential for students in class-7? hard MCQ Importance & Significance
- 5 Which key practice is recommended while studying topics in 'Wastewater Story'? medium MCQ Scientific Method
- 6 What is the primary topic or theoretical principle explored in 'Wastewater Story' (Class 7 SCIENCE)? medium MCQ Chapter Core Principle
- 7 Which key mechanism or analytical rule is highlighted in 'Wastewater Story'? medium MCQ Key Analytical Mechanism
- 8 Which component of domestic wastewater gives the green colour often seen in untreated sewage? easy MCQ 1 mark Colour of wastewater
- 9 A household generates 200 litres of wastewater per day. If 60 % is treated in a primary settling tank and the remaining 40 % in a secondary biological reactor, how many litres are treated in each system? medium 2 marks Percentage calculation in wastewater treatment
- 10 A small town’s wastewater treatment plant can treat 1500 m³ of wastewater per day. During a week, it operates at an average utilisation of 70 %. What is the total volume of wastewater treated in that week? hard 3 marks Capacity utilisation calculation
- 11 Explain why the treatment of wastewater is essential for protecting aquatic life, describing the roles of primary, secondary and tertiary treatments. hard 5 marks Importance of wastewater treatment
- 12 The primary treatment stage of a wastewater treatment plant mainly involves which of the following processes? easy MCQ 1 mark Primary treatment function
- 13 A factory discharges 3000 L of wastewater daily. The treatment plant processes 70 % in a primary settler, 20 % in a secondary reactor, and the rest in a tertiary unit. How many litres are treated in the tertiary unit? medium 2 marks Percentage calculations
- 14 A small town’s wastewater treatment plant can treat 1200 m³ of wastewater per day. During a week of 6 days, it operates at an average utilisation of 65 %. What is the total volume of wastewater treated in that week? medium 2 marks Utilisation calculation