Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause___________________?

Related Mcqs:

1. Exposure to chemicals having carcinogenic properties cause___________________?

   A. Dermatitis (skin disorder)
   B. Cancer
   C. Asphyxiation
   D. Asthma

2. COD of raw municipal sewage may be in the range of about _____________ mg/litre?

   A. 1-2
   B. 5-10
   C. 90-120
   D. 1500-2500

3. BOD of raw municipal sewage may be in the range of about _____________ mg/litre?

   A. 1-2
   B. 5-10
   C. 150-300
   D. 2000-3000

4. The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by_________________?

   A. Biological oxygen pond
   B. Aerated lagoons
   C. Trickling filters
   D. Gravity separator having oil skimming devices

5. Inhalation of lead compounds present in automobile exhaust (using leaded petrol) causes__________________?

   A. Blood poisoning
   B. Anaemia
   C. Nervous system disorder
   D. All A., B. & C.

6. Inhalation of lead compounds present in the automobile exhausts (using leaded petrol) causes________________?

   A. Blood poisoning
   B. Anaemia
   C. Nervous system disorder
   D. All A., B. and C.

7. Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal ?

   A. By chemical coagulation
   B. In sedimentation tanks equipped with mechanical scrapper
   C. In vacuum filter
   D. In clarifiers

8. Presence of _____________ bacteria in water causes disease like typhoid?

   A. Aerobic
   B. Pathogenic
   C. Anaerobic
   D. Non-pathogenic

9. Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in____________________?

   A. Coagulation and flocculation of colloids
   B. Oxidation of carbonaceous matter to CO2
   C. Nitrification or oxidation of ammonia derived from breakdown of nitrogenous organic matter
   to the nitrite and eventually to the nitrate
   D. All A., B. and C.

10. Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N2 in contaminated air at which it acts as a natural asphyxiate is ≥ _____________ percent?

    A. 84
    B. 88
    C. 80
    D. 92