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- Wastewater Story
NCERT Exemplar Solutions Class 7 Science Solutions for Wastewater Story - Exercise in Chapter 18 - Wastewater Story
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In a filtration, plant water is filtered using layers of
(a) sand and clay.
(b) clay and fine gravel.
(c) sand and fine gravel.
(d) sand, fine gravel and medium gravel.
Answer:
The answer is (d) sand, fine gravel and medium gravel.
Explanation:
During wastewater treatment wastewater is allowed to enter a grit of sand, fine gravel and medium gravel. Here the speed of wastewater is slowed down to allow sand, fine gravel and medium gravel to settle down.
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