Presence of nitrates in water in excess of 50 ppm causes________________?

Related Mcqs:

1. Presence of excess fluorine in water causes__________________?

   A. Dental cavity
   B. Tooth decay
   C. Fluorosis
   D. Respiratory disease

2. Which of the following causes death by asphyxiation, if its presence in atmospheric air exceeds maximum allowable concentration (i.e. > 50 ppm) ?

   A. Benzopyrene
   B. Peroxyacetyl nitrate
   C. Carbon monoxide
   D. Sulphur dioxide

3. Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyll and haemoglobin breakdown of some animals, beyond TLV (>50 ppm) ?

   A. Acts as a green house gas thereby raising earth’s temperature
   B. Causes asphyxia
   C. Causes increase in sea level
   D. Enhances the green house effect

4. 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.

5. Moist atmospheric air at high temperature (e.g., in summer) having high concentration of sulphur dioxide causes________________?

   A. Fading of dyes on textiles
   B. Corrosion, tarnishing & soiling of metals
   C. Reduced strength of textiles
   D. All A., B. and C.

6. For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than ______________ ppm?

   A. 10000
   B. 5
   C. 500
   D. 1000

7. TLV of mercury in potable (drinking) water is about ______________ ppm?

   A. 0.001
   B. 0.1
   C. 1
   D. 5

8. Maximum permissible turbidity in potable water is _____________ ppm?

   A. 1
   B. 10
   C. 250
   D. 1000

9. TLV of lead for public sewer/waste water is about ______________ ppm?

   A. 1
   B. 25
   C. 150
   D. 650

10. Dissolved oxygen content in river water is around _____________ ppm?

    A. 5
    B. 100
    C. 250
    D. 500