Environmental Engineering
In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be

300 ppm
200 ppm
400 ppm
100 ppm

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Environmental Engineering
Double filtration is used

For isolated buildings like pools, hotels etc swimming
All of these
To increase the filtration slow sand filters capacity of
To increase the filtration rapid sand filters capacity of

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