Thursday, 19 November 2020

CBSE Class 7 Science - Chapter 18: Wastewater Story - Worksheet (#class7Science)(#eduvictors)

CBSE Class 7 Science - Chapter 18: Wastewater Story - Worksheet

CBSE Class 7 Science - Chapter 18: Wastewater Story - Worksheet (#class7Science)(#eduvictors)


Fill in the blanks with suitable words.

1. __________ is celebrated as World Water Day.


2. Drinking water is also called _________ water.


3. Contaminated water causes many water borne diseases such as _____________.


4. Water collected from houses, streets, industries is collectively termed __________.


5. Two examples of organic impurities present in sewage are  __________ and ___________.


6. Waste water released from the _______ is called sullage water.


7. The network of small and big pipes that carry wastewater is called _______, which collectively form the __________.


8. In water treatment plants, ________ are screens that prevent the flow of large objects in wastewater. 


9. A ________ is a tank with its central part inclined downwards that allows faeces to settle down.


10. ________ tablets or ozone is used to disinfect water in treatment plants.


11. A composting toilet is a system that converts human waste into ____________.



Answer:
1: March 22nd
2: potable
3: cholera, typhoid and diarrhoea (any one)
4: sewage
5: animal waste, urine, oil, vegetable and fruit waste, faeces (any two)
6: kitchen
7: sewers, sewerage
8: bar screens
9: clarifier
10. Chlorine
11. organic compost/manure

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