Salt content in sea water is about ______________ percent?

Related Mcqs:

1. 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...

2. The concentration of water vapour in troposphere, which depends upon the altitude & temperature, varies in the range of zero to ______________ percent?

   A. 1 B. 4 C. 8 D. 12...

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

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

4. ______________ content of the phosphate rock is the pollutant of primary interest in a phosphatic fertiliser plant ?

   A. Calcium B. Fluorine C. Phosphorous D. Sulphur...

5. Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of_________________?

   A. Ozone and iodine B. Chlorine or its compounds C. Ultraviolet light for irradiation of water D. All A., B. & C....

6. The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant ?

   A. Chlorine B. Alkalis C. Benzene hexachloride D. Alkyl benzene sulphonate (ABS)...

7. The amount of chemical coagulant added for treatment of polluted water ______________ with increase in temperature of the polluted water to be treated?

   A. Decreases B. Increases C. Remain constant D. May increase or decrease; depends on the chemical characteristics of polluted water...

8. Acute danger to human life (i.e. death) exists, if the concentration of CO2 in atmospheric air exceeds ______________ percent (by volume)?

   A. 1 B. 3 C. 7 D. 20...

9. During which of the following operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum ?

   A. Idle running B. Acceleration C. Cruising D. Deceleration...

10. In water treatment plant, zeolite process is used to remove the _____________ of water?

    A. Acidity B. Alkalinity C. Hardness D. Iron & zinc...