Paper 1 · People, Development and Environment
Sewage consists primarily of which of the following? 1. Water, containing less than one part of solid matter per thousand parts of water. 2. Solids that can be either dissolved or suspended. 3. A normal mixture of solid and gas. 4. Gaseous waste.
- Water, containing less than one part of solid per thousand parts of water
- Solids that can be either dissolved or suspended
- A normal mixture of solid and gas
- Gaseous waste
A1, 2 and 3
B2 and 3
C1 and 2 ✓ Correct
D3 and 4
Correct answer: (C) 1 and 2 — Statements 1 and 2 describe sewage, so that is the answer.
Explanation
★Statements 1 and 2 describe sewage, so that is the answer.
★Sewage is mostly water with a very small fraction of solid matter.
★So statement one is correct.
★That solid matter is present as dissolved or suspended solids.
★So statement two is correct, while the solid-gas and gaseous descriptions do not fit.
★So the answer is 1 and 2.
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