HARD
7th CBSE
IMPORTANT
Earn 100
What is a septic tank? Describe the septic tank based toilet with the help of a labelled diagram. Where are septic tank toilets used?
Important Questions on Wastewater Story
MEDIUM
7th CBSE
IMPORTANT
Which of the following statements about ozone are correct?
A. It is essential for breathing of living organisms.
B. It is used to disinfect water.
C. It absorbs ultraviolet rays.
D. Its proportion in air is about .
MEDIUM
7th CBSE
IMPORTANT
Which of the following is not an inorganic impurity present in sewage?
MEDIUM
7th CBSE
IMPORTANT
Which of the following organisms produce biogas from sludge in the digester tank of a wastewater treatment plant?
MEDIUM
7th CBSE
IMPORTANT
Which of the following can be used to disinfect the clean water in a sewage treatment plant before releasing it into the distribution system?
A. Iodine
B. Ozone
C. Oxygen
D. Chlorine
MEDIUM
7th CBSE
IMPORTANT
Which of the following is not a water-borne disease?
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
