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