Engineering :: Environmental Engineering
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91. |
Odours are generally expressed in terms of |
A. |
Hardness number |
B. |
Gravity number |
C. |
Index number |
D. |
Threshold number |
E. |
None of the above |
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Answer: Option D
Explanation:
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92. |
Which of the following turbidimeter gives direct readings in ppm |
A. |
Jackson turbidimeter |
B. |
Hellige turbidimeter |
C. |
Baylis turbidimeter |
D. |
All of the above |
E. |
None of the above |
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Answer: Option A
Explanation:
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93. |
To keep the water safe against pathogenetic bacteria the residual chlorine should remain between |
A. |
0.05 to 0.2 ppm |
B. |
0.2 to 0.8 ppm |
C. |
1 ppm to 2 ppm |
D. |
6 ppm to 10 ppm |
E. |
10 ppm to 20 ppm |
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Answer: Option A
Explanation:
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94. |
Brackish taste of water is due to |
A. |
Chlorides of sodium |
B. |
Fluorides of sodium |
C. |
Turbidity |
D. |
Dead bacteria |
E. |
Any of the above |
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Answer: Option A
Explanation:
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95. |
The hardness of soft water (in ppm) is |
A. |
0 - 50 |
B. |
50 - 150 |
C. |
200 - 350 |
D. |
375 - 500 |
E. |
500 - 1000 |
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Answer: Option A
Explanation:
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96. |
The process of passing the water through a thick layer of filtering media is known as |
A. |
Sedimentation |
B. |
Filtration |
C. |
Disinfection |
D. |
Purification |
E. |
Putrification |
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Answer: Option B
Explanation:
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97. |
The process of killing the ineffective bacteria from the water and making it safe for use is known as |
A. |
Disinfection |
B. |
Sterilization |
C. |
Filtration |
D. |
Purification |
E. |
None of the above |
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Answer: Option A
Explanation:
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98. |
Which of the following is an insect born disease? |
A. |
Q-fever |
B. |
Ring worm |
C. |
Jaundice |
D. |
Tetanus |
Answer: Option A
Explanation:
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99. |
The bactericidal, virucidal and cysticidal efficiency of chlorine as a disinfectant |
A. |
increases with a decrease in pH |
B. |
increases with a increase in pH |
C. |
decreases with a decrease in pH |
D. |
decreases with an increase in pH |
Answer: Option A
Explanation:
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100. |
All of the following are pesticides EXCEPT: |
A. |
Aldrin |
B. |
Endrin |
C. |
Chloroform |
D. |
BHC |
Answer: Option C
Explanation:
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