Disinfection of Water MCQ – Environmental Engineering

21. For disinfection of water with uluraviolet rays, the turbidity should not exceed

  1. 25 mg/l
  2. 15 mg/
  3. 75 mg/l
  4. 50 mg/l
Answer
Answer. b

22. Which one of the following chemicals is employed for dechlorination of water?

  1. Sodium sulphite
  2. Sodium bicarbonate
  3. Calcium carbonate
  4. Hydrogen peroxide
Answer
Answer. a

23. In chlorination, due to rise in temperature of water, death rate of bacteria

  1. increases
  2. decreases
  3. remains unaffected
  4. none of the above
Answer
Answer. a

24. Residual chlorine in water is determined by

  1. starch iodide method
  2. orthotolidine method
  3. both a and b
  4. none of the above
Answer
Answer. c

25. Normal standard process of applying chlorine to water

  1. Plain chlorination
  2. Pre chlorination
  3. Post chlorination
  4. Double chlorination
Answer
Answer. c

26. In water Ureaunent both pre-, and post-, chlorination of water are done to control

  1. Colour
  2. Odour
  3. Water-borne diseases due to bacteria
  4. Algae
  5. Turbidity
  6. TDS

Which of the above are correct?

  1. i, ii, iii and iv
  2. ii, iii, iv and v
  3. iii, iv, v and vi
  4. i, iii, v and vi
Answer
Answer. a

27. Process which involves chlorination beyond the break point is known as

  1. Post-chlorination
  2. Pre-chlorination
  3. Hype-chlorination
  4. Super- chlorination
Answer
Answer. d
error: Content is protected !!

Adblocker detected! Please consider reading this notice.

We've detected that you are using AdBlock Plus or some other adblocking software which is preventing the page from fully loading.

We don't have any banner, Flash, animation, obnoxious sound, or popup ad. We do not implement these annoying types of ads!

We need fund to operate the site, and almost all of it comes from our online advertising.

Please add electricalvoice.com to your ad blocking whitelist or disable your adblocking software.

×