A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called___________________?

Related Mcqs:

1. The type of bacteria which is active in trickling filter during biological treatment of sewage is the _____________ bacteria?

   A. Anaerobic
   B. Saprophytic
   C. Aerobic
   D. Parasitic

2. Which of the following processes is involved in the biochemical treatment of sewage effluents ?

   A. Oxidation
   B. Reduction
   C. Dehydration
   D. Fermentation

3. Forward reaction will be favoured for the exothermic reaction, represented by CO + H2O ⇌ CO2 + H2, by_________________?

   A. Low temperature and high pressure
   B. Low temperature and low pressure
   C. High temperature and high pressure
   D. High temperature and low pressure

4. Consider the reaction, C + O2 ⇌ CO2; ΔH = – 94 kcal. What will be the value of ΔH for the reaction CO2 → C + O2 ?

   A. -94 kcal
   B. +94 kcal
   C. > 94 kcal
   D. < -94 kcal

5. If the molar heat capacities (Cp or Cv) of the reactants and products of a chemical reaction are identical, then, with the increase in temperature, the heat of reaction will___________________?

   A. Increase
   B. Decrease
   C. Remain unaltered
   D. Increase or decrease; depends on the particular reaction

6. In the reaction, represented by, 2SO2 + O2 ⇌ 2SO3; ΔH = – 42 kcal; the forward reaction will be favoured by____________________?

   A. Low temperature
   B. High pressure
   C. Both A. and B
   D. Neither A. nor B

7. In troposphere (the weather domain), the temperature ‘t’ at height ‘h’ above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C ?

   A. t = 15 – 0.0065h
   B. t = 15 + 0.0065h
   C. t = 0.0035h -15
   D. t = 15 – 0.0035h

8. Infective bacteria in water is killed by the _____________ process?

   A. Sterilisation
   B. Aeration
   C. Disinfection
   D. None of these

9. Carbonaceous particles having size less than 1 μm are called___________________?

   A. Grit
   B. Aggregates
   C. Aerosols
   D. Smoke

10. 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.