Fill in the Blanks
a. The kinds of material present in the wastewater are called _________
b. Water is used as a coolant in the _________
c. A septic tank is suitable for places having _________
d. _________ are the major cause of water pollution.
e. In an aerated tank_________ is decomposed.
f. The main sewer pipelines are called _________
g. Aerobic bacteria feed on organic matter and produce _________
h. The junction of the sewers from homes is called _________
i. The microorganisms which help in wastewater treatment settle at the bottom of the tank to form _________
j. The sludge from the settlement tank is shifted to another tank called _________
k. Large objects and garbage in the wastewater are removed by passing them through the _________
l. In the final step, the wastewater is treated with _________
m. The activity of bacteria on the sludge causes _________
n. The treatment of wastewater basically includes the removal of _________
(Keywords : acrobic , organic , sludge , waster water treatment plant , earthworm , drainage, contaminants)
i. Vermicomposting toilets are ________________ to treat human waste.
ii. The full form of W WTP is _________________________________
iii. Cooking oil, fats should not be thrown in the ___________________ system directly, as they choke the pipes.
iv. _______________ bacteria consume human waste, food, water etc. in clarified water.
v. ____________ is decomposed by anaerobic bacteria.
vi. Urea is an ____________ impurity present in sewage.
vii. ____________________ is a term used for the undesirable substances present in water.
Write scientific terms for the following:-
i. Waste water released by homes, industries. Hospitals and offices ____________
ii. Impurities dissolves and suspended in waste water ________________
iii. Water that is safe for drinking ___________________
iv. Large, solid objects have to pass through which part in W WTP. ______________
Multiple Choice Questions
Pick from the following one chemical used to disinfect water.
(b) Washing soda
Sewage is mainly a
(a) liquid waste.
(b) solid waste.
(c) gaseous waste.
(d) mixture of solid and gas
Open drain system is a breeding place for which of the following.
(c) Organisms which cause diseases
(d) All of these
Which of the following is not a source of waste water?
Short Answer type
The terms sewage, sewers and sewerage are interlinked with each other. Can you explain, how?
Describe onsite disposal system.
What is sewage?
Why is sanitation important?
What is wastewater? How is it produced?
How are pieces of Glass and wood removed from the sewage?
Why is chlorine added to wastewater?
What does household wastewater mainly contain?
List two better housekeeping practices to manage wastewater?
Mention two ways by which awareness for the need of sanitation in public places can be created?
A septic tank cannot be built in a place with clayey soil. Why?
Explain the types of contaminants with examples?
Draw a septic tank and explain how it works?
How is sludge disposed?
Decomposers are nature's waste disposal system. Explain?
Mention two methods which you can personally put into operation for reducing sewage production in your homes?
What happens in the secondary stage of wastewater treatment?
Explain the sewage system at homes in cities?
How do unsanitary conditions prevail due to fresh water?
What is a septic tank? How does it function?
Schematically represent the process of wastewater treatment?
Mrs Mathur disposes of all the waste into the drain. How would you educate her about the effect of negligence on the sewage treatment?
Chlorine is passed into water in the sewage treatment plant. Give reason?
What is 'Sulabh International' and how have they tackled the problem of environmental sanitation?
Why should we plant eucalyptus trees near sewage drains?
Describe vermi-processing toilets. What role is played by these toilets in the favour of human being?
How can you as an individual take initiative to lesson the load of W WTP?
What are the ill effects of open drains?
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Class 7 Maths
Class 7 Science