The filter over which sewage is sprinkled is called as
A). Trickling filter
B). Percolating filter
C). Contact bed
D). Intermittent sand filter
Trickling filter
A trickling filter, also known as percolating filter, is an artificial bed of stone or broken brick material over which waste water or sewage is allowed to sprinkle or to trickle. It is then collected through the under drainage system.
2. Extensively used nitrogenous fertilizer is
3. Which of the following is used as a lubricant in heavy machines?
4. The chemical used for cloud seeding for artificial rains is
7. Which one of the following is used for dating very old objects of archaeological importance?
8. Activated Charcoal is used to remove colouring matter from pure substances by
9. The resources which can be used continuously year after year ate called
10. Which among the following elements is found in maximum percentage in the human body ?