Pick up the correct statement from the following ?

Related Mcqs:

1. Pick up the correct statement from the following?

   A. In treated sewage, 4 ppm of D.O. is essential
   B. Only very fresh sewage contains some dissolved oxygen
   C. The solubility of oxygen in sewage is 95% that is in distilled water
   D. All the above

2. Pick up the correct statement from the following?

   A. The water supply pipes carry pure water free from solid particles
   B. The water supply pipes get clogged if flow velocity is less than self cleansing velocity
   C. The sewers may be carried up and down the hills and valleys
   D. The sewer pipes are generally laid along level hills

3. Pick up the correct statement from the following ?

   A. Rate of digestion of sludge is more at higher temperature
   B. Thermophilic organisms digest the sludge if the temperature ranges from 40° to 60°C
   C. Mesophilic organisms digest the sludge if the temperature is between 25° and 40°C
   D. All the above

4. Pick up the correct statement from the following ?

   A. The larger the sewer in size, more will be velocity
   B. The smaller the sewer in size, less will be velocity
   C. The larger the sewer in size, no deposition will take place
   D. The larger the sewer in size, deposition will take place

5. Pick up the correct statement from the following ?

   A. Turbidity is more in strong sewage
   B. The black colour indicates septic sewage
   C. The sewage omits offensive odours after four hours
   D. All the above

6. Pick up the correct statement from the following _________________?

   A. The materials separated by screens, is called screenings
   B. The screenings are disposed off either by burning or by burial or by dumping
   C. The process of burning the screenings, is known as compositing
   D. All the above

7. Pick up the in-correct statement from the following?

   A. Manholes are provided in sewer pipes at suitable intervals
   B. Catch basins are generally provided in sewers for carrying drainage discharge
   C. Inlets are generally provided in all sewers
   D. None of these

8. Pick up the correct statement from the following?

   A. Inlets are provided on the road surface at the lowest point for draining rain water
   B. Inlets are generally provided at an interval of 30 m to 60 m along straight roads
   C. Inlets having horizontal openings, are called horizontal inlets
   D. All the above

9. Pick up the correct statement from the following?

   A. The circular section of sewers provides maximum hydraulic mean depth
   B. The circular sewers are provided for separate sewerage system
   C. The circular sewers work efficiently if the sections run at least half full
   D. All the above

10. Pick up the correct statement from the following?

    A. Anaerobic bacteria flourish in the absence of oxygen
    B. Aerobic bacteria flourish in the presence of oxygen
    C. Facultative bacteria flourish with or without oxygen
    D. All the above