LESSON 2
PRACTICE EXERCISE
The following items will test your grasp of the material covered in this lesson. There is only one correct answer
for each item. When you complete the exercise, check your answers with the answer key that follows. If you
answer any item incorrectly, study again that part of the lesson which contains the portion involved.
1. What duration is considered long-term consumption?
A.
Seven hours
B.
One day
C.
Seven days
D.
Eight days
2. What duration is the maximum short-term consumption?
A.
Seven hours
B.
One day
C.
Seven days
D.
Eight days
3. For the ROWPU, when is chlorine added to water?
A.
Before the RO process
B.
During the RO process
C.
After the RO process
D.
None of the above
4. When does the form of the chlorine residual change from hypochlorous acid (HOC1) (the most effective form)
to hypochlorite ion (OCI-) which is less effective?
A.
When the pH changes from 5 to 9
B.
When the pH changes from 7 to 11
C.
When the pH changes from 8 to 12
D.
When the pH changes from 9 to 13
2-11
QM4916
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