Paper 1 · People, Development and Environment
UGC NET December 2021 June 2022 (11.07.2022) Shift-I
Grey water consists of which of the following?
- 1. Kitchen waste water
- 2. Waste water containing faecal matter
- 3. Waste water from industrial units
- 4. Bathroom waste water
- 5. Water from agricultural run-off
A1, 2, 3 and 5 only
B1, 3, 4 and 5 only
C3 and 5 only
D1 and 4 only ✓ Correct
Correct answer: (D) 1 and 4 only — Grey water is made up of kitchen and bathroom waste water, so the answer is 1 and 4.
Explanation
★Grey water is made up of kitchen and bathroom waste water, so the answer is 1 and 4.
★Grey water is the relatively clean waste water from sinks, showers, basins, and washing machines.
★It carries fewer pathogens and no faecal contamination.
★Waste water that contains faecal matter is called black water, not grey water.
★Industrial effluent and agricultural run-off are separate pollution streams, not grey water.
★Grey water can be reused for gardening or flushing after simple treatment.
★Distinguishing grey water from black water is important for water recycling and conservation.
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