Question
The diagram shows the uses and treatment processes of muddy river water.
Which row identifies uses 1 and 2 and processes 1 and 2?
Answer/Explanation
Ans:
D
Question
Water can be treated by filtration then chlorination. Which uses do not need water of this quality?
1 water for cooling in industry
2 water for washing clothes
3 water for drinking
A. 1, 2 and 3 B. 1 and 2 only C. 1 and 3 only D. 2 and 3 only
Answer/Explanation
Ans:
B
Question
Water is treated at a waterworks to make it fit to drink.
What is present in the water when it leaves the waterworks?
A bacteria only
B bacteria and insoluble substances
C chlorine compounds only
D chlorine compounds and soluble substances
Answer/Explanation
Ans: D
Question
Which process removes carbon dioxide from the atmosphere?
A combustion
B decomposition
C photosynthesis
D respiration
▶️Answer/Explanation
Ans:C