The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of _____________ of water?

Related Mcqs:

1. Which of the following is the most detrimental for water used in high pressure boiler ?

   A. Silica
   B. Turbidity
   C. Phenol
   D. Dissolved oxygen

2. Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of _____________ present in it?

   A. Coal ash
   B. Potassium cyanide
   C. Ortho-xylene
   D. None of these

3. 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

4. Presence of ____________ in water stream are deleterious to aquatic life?

   A. Soluble and toxic organics
   B. Suspended solids
   C. Heavy metals and cyanides
   D. All A., B. & C.

5. ______________ is the process of killing organism in water ?

   A. Coagulation
   B. Sterilisation
   C. Disinfection
   D. Sedimentation

6. Foaming and priming in boiler operation can be reduced by reduction in ______________ in feed water?

   A. Turbidity
   B. Color (Hazen)
   C. Total solids
   D. All A., B. & C.

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. There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth’s surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about _____________ °C/km?

   A. 0.05
   B. 1
   C. 6.5
   D. 15

9. The effect of increase in carbon dioxide level of the atmosphere and its profound effect on our climate is called the ________________?

   A. Catalytic conversion
   B. Green house effect
   C. Global warming
   D. Both B. and C.

10. 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.