MEDIUM
7th CBSE
IMPORTANT
Earn 100
Which of the following is not a water-borne disease?
59.38% studentsanswered this correctly
Important Questions on Wastewater Story
HARD
7th CBSE
IMPORTANT
One of the following types of trees is said to help in purifying wastewater quite rapidly when planted all along with the sewage ponds. These are:
MEDIUM
7th CBSE
IMPORTANT
Which of the following are used for the safe disposal of human excreta in those areas where sewerage system does not exist and water supply is limited or not available at all?
MEDIUM
7th CBSE
IMPORTANT
Vacuum toilets are usually used in
MEDIUM
7th CBSE
IMPORTANT
A sewage treatment plant involves the following steps in its working:
Aeration tank, Grit and sand removal tank, Second sedimentation tank, Bar screen, First sedimentation tank
(a) Arrange all the above steps in the correct order in which they occur in the sewage treatment plant.
(b) Which step gives most of the sludge which is used for obtaining biogas fuel?
HARD
7th CBSE
IMPORTANT
Some of the alternative sewage disposal systems for human waste are given below:
Chemical toilets, Composting toilets, Vacuum toilets, Septic tank toilets, Vermi-processing toilets
(a) Which of these toilets provide high quality manure?
(b) Which of these toilets are used in aeroplanes?
(c) Which of these toilets are used at outdoor gatherings like marriages?
(d) Which of these toilets are used where water supply is limited or not available at all?
(e) Which of these toilets is most likely to contaminate water of a hand-pump installed nearby?
