Question 1 : The number of bacterial colonies by Agar plate count test should not exceed ____ per ml for potable water.
1. 1
2. 10
3. 100
4. 1000
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Question 2 :

Degree of hardness	Nature of water
1	Extremely soft water
2	Very soft water
3	Soft water
9	?

What can be filled in place of the question mark in the above table?
1. Excessive hard water
2. Reasonably soft water
3. Very hard water
4. Hard water
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Question 3 : Which of the following is the disease caused by bacterial infections?
1. Amoebic dysentery
2. Infectious hepatitis
3. Typhoid fever
4. Poliomyelitis
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Question 4 : Given list 1 and list 2, find which of the following pair is correctly matched?

List 1 (Chemical substance)	List 2 (Permissible limit in ppm)
A. Lead	1. 0.05
B. Phenol	2. 0.001
C. Zinc	3. 0.01
D. Chromium	4. 5
	5. 0.2

1. A-5
2. B-3
3. C-4
4. D-2
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Question 5 : What is the temperature at which MPN test is performed?
1. 35^oC
2. 37 ^oC
3. 40^oC
4. 45 ^oC
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Question 6 : 1 TCU (True Color Unit) is equivalent to _____
1. The color produced by 1 g of platinum cobalt
2. The color produced by 1 mg of platinum cobalt
3. The color produced by 1 mg of platinum cobalt in 1L of distilled water
4. The color produced by 1 mg of platinum cobalt in 1mL of distilled water
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Question 7 : Which bacteria results in the corrosion of iron and steel pipes embedded in soil?
1. Escherichia coli bacteria
2. Bacterium coli bacteria
3. Iron bacteria
4. Sulphur bacteria
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Question 8 : The range of temperature of water that is required to do the temperature test is__ ⁰C.
1. 10-25
2. 0-25
3. 10-30
4. 20-30
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Question 9 : One degree of hardness is equivalent to ___ ppm
1. 2
2. 1
3. 10
4. 100
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Question 10 : One JTU is equivalent to turbidity produced by
1. 1mg of fine silica dissolved in 1L of distilled water
2. 1g of fine silica dissolved in 1L of distilled water
3. 1g of fine silica dissolved in 1ml of distilled water
4. 1mg of fine silica dissolved in 1ml of distilled water
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