A lake with an inflow of domestic sewage rich in organic waste may result in:

Related Mcqs:

1. The waste of steel factories is rich in:

   A. Cyanides and phenols
   B. Chlorides and fluorides
   C. Carbonates and sulphides
   D. Bicarbonates and chlorides

2. A country where _____ per cent of the total aea consists of moutains, gullied foot hills, arid waste and deserts, can never achieve the desired progress unless major part of this usable waste is harnessed to the advantage of its people:

   A. 50 to 55
   B. 55 to 60
   C. 65 to 70
   D. None of these

3. During anaerobic digestion of organic waste, such as in producing biogas, which of the following is left undegraded?

   A. Lignin
   B. Lipids
   C. Cellulose
   D. Hemi-cellulose

4. The domestic animals resorting to forests may be classed under the heads of:

   A. Grazers
   B. Browsers
   C. Both (a) & (b)
   D. None of these

5. A disease caused by eating fish contained by industrial waste having mercury compounds is known as:

   A. Minamata disease
   B. Osteosclerosis
   C. Bright’s disease
   D. Hashimoto disease

6. Soil formed-after leaching and rich in Al and Fe is

   A. Alluvial
   B. Padsol
   C. Laterite
   D. None of these

7. Rich in fauna and flora areas:

   A. Northern mountainous areas embracing Himalayan, Korakoram and Hindu Kush ranges
   B. In northern areas, Malakand, Hazara and Azad Kashmir are rich in fauna and flora
   C. Both (a) & (b)
   D. None of these

8. BOD value of sewage water than that of tap water is:

   A. More
   B. Less
   C. Equal
   D. Somewhere more somewhere less

9. As compared to tap water the BOD of sewage polluted water shall be:

   A. High
   B. Low
   C. Same
   D. None of these

10. When excess of sewage is dumped in the river, its BOD:

    A. Increases
    B. Slightly decreases
    C. Remains unchanged
    D. Decreases drastically