Following are some of the multiple choice questions on the Environmental Engineering with answers that will help the students in developing their knowledge.
Environmental Engineering MCQ
1. Activated carbon is used for
2. The polluted water is one which
3. Sludge volume index is defined as the ratio of
4. The maximum permissible limit for fluoride in drinking water is
5. As compared to shallow wells, deep wells have
6. As compared to rapid sand filters, slow sand filters give (i) Slower filtration rate (ii) Higher filtration rate (iii) Lesser efficiency in removal of bacteria (iv) Higher efficiency in removal of bacteria The correct answer is
7. As compared to cast iron pipes, steel pipes are
8. The water carriage system of collection of waste product
9. Sewage treatment units are designed for
10. Facultative bacteria are able to work in
11. An egg shaped section of sewer
12. The length of rectangular sedimentation tank should not be more than(Where ‘B’ is the width of the tank)
13. The self cleansing velocity for all sewers in India is usually
14. In water treatment, rapid gravity filters are adopted to remove
15. Most suitable section of sewer in separate sewage system is
16. The most common cause of acidity in water is
17. Period of cleaning of slow sand filters is about
18. The means of access for inspection and cleaning of sewer line is known as
19. Residual chlorine in water is determined by
20. The maximum efficiency of BOD removal is achieved in
21. A sewer that receives the discharge of a number of house sewers is called
22. As compared to geometrical increase method of forecasting population, arithmetical increase method gives
23. Generally the detention period for grit chambers is kept as
24. The rate of BOD exerted at any time is
25. If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to
26. In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be
27. The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is
28. The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of
29. If the coli form bacteria is present in a sample of water, then the coli-form test to be conducted is (i) Presumptive coli-form test (ii) Confirmed coli-form test (iii) Completed coli-form test
30. Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about
31. The type of sewer which is suitable for both combined and separate system is
32. The amount of coagulant needed for coagulation of water increases with (i) Increase in turbidity of water (ii) Decrease in turbidity of water (iii) Increase in temperature of water (iv) Decrease in temperature of waterThe correct answer is
33. Double filtration is used
34. For normal sludge, the value of sludge index for Indian conditions is
35. Septic tank is a (i) Settling tank (ii) Digestion tank (iii) Aeration tank
36. The percentage of filtered water, which is used for backwashing in rapid sand filters, is about
37. The percentage of chlorine in fresh bleaching powder is about
38. For a country like India, where rainfall is mainly confined to one season, the suitable sewerage system will be
39. Dissolved oxygen in streams is
40. If the time of concentration is 9 minutes, then the intensity of rainfall according to British Ministry of Health formula will be
41. The rate of Alteration of pressure filters is
42. A pipe which is installed in the house drainage to preserve the water seal of traps is called
43. Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)
44. Which of the following is not a water borne disease?
45. The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is
46. The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about
47. Which of the following retards the self purification of stream?
48. Cleaning is done by (i) Scraping and removal in filters slow sand (ii) Back washing in slow sand filters (iii) Scraping and removal in filters rapid sand (iv) Back washing in rapid sand filtersThe correct answer is
49. Sewage treatment units are normally designed for
50. Sewerage system is usually designed for
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