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Wastewater Story

Explain the function of bar screens in a wastewater treatment plant.

04/11/2024

Science

7th

Wastewater Story

Name two chemicals used to disinfect water.

04/11/2024

Science

7th

Wastewater Story

Untreated human excreta is a health hazard. Explain.

04/11/2024

Science

7th

Wastewater Story

What is sludge? Explain how it is treated.

04/11/2024

Science

7th

Wastewater Story

Describe the steps involved in getting clarified water from wastewater.

04/11/2024

Science

7th

Wastewater Story

Why should oils and fats be not released in the drain? Explain.

04/11/2024

Science

7th

Wastewater Story

What is sewage? Explain why it is harmful to discharge untreated
sewage into rivers or seas.

04/11/2024

Science

7th

Wastewater Story

Fill in the blanks:
(a) Cleaning of water is a process of removing ____________.
(b) Wastewater released by houses is called ____________.
(c) Dried ____________ is used as manure.
(d) Drains get blocked by ____________ and ____________.

04/11/2024

Science

7th

Wastewater Story

Study the following statements about ozone:
(a) It is essential for breathing of living organisms.
(b) It is used to disinfect water.
(c) It absorbs ultraviolet rays.
(d) Its proportion in air is about 3%.
Which of these statements are correct?
(i) (a), (b) and (c)
(ii) (b) and (c)
(iii) (a) and (d)
(iv) All four

04/11/2024

Science

7th

Forest: Our lifeline

Micro-organisms act upon the dead plants to produce
(i) sand (ii) mushrooms (iii) humus (iv) wood

04/11/2024

Science

7th