EXAMIANS
The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is
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The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is
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The self cleansing velocity for all sewers in India is usually
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Septic tank is a (i) Settling tank (ii) Digestion tank (iii) Aeration tank
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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
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Air binding phenomena in rapid sand filters occur due to
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The pathogens can be killed by
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The hourly variation factor is usually taken as
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As compared to geometrical increase method of forecasting population, arithmetical increase method gives
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The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about
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