Related Questions

Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters.
Reason R: The sand used in slow sand filters is finer than that in rapid sand filters
Select your answer based on the coding system given below:
Cleaning is done by
(i) Scraping and removal in filters slow sand
(ii) Back washing in slow sand filters
(iii) Scraping and removal in filters rapid sand
(iv) Back washing in rapid sand filters
The correct answer is
In which city the world's tallest sandcastle has been built ?
Three containers whose volumes are in the ratio of 2 : 3 : 4 are full of mixture of spirit and water. In the 1st container the ratio of spirits and water is 4 : 1, in 2nd container the ratio is 11 : 4 and on the 3rd container ratio is 7 : 3. All the three mixtures are mixed in a big container. The ratio of spirit and water in the resultant mixture is ?
Statement: When a beetle moves along the sand within a few tens of centimetres of a sand scorpion, the scorpion immediately turns towards the beetle and dashes towards it. Reason: When a beetle disturbs the sand, it sends pulses is longitudinal, while the other set in transverse.
Consider the following statement regarding the depth of sand of the rapid gravity filter? i. It should be checked against breakage of floc ii. The sand depth should lie between 100-200cm iii. The floc should be attached through the sand bed Which of the above statement is/are correct?
Consider the following statement. i. The penetration of suspended matter is deep in the slow sand filter ii. The penetration of suspended matter is superficial in the rapid sand filter iii. Coagulation is not required in the slow sand filter Which of the above statement is/are correct?
Consider the following statement. i. The slow sand filter is not efficient in removing turbidity ii. The slow sand filter has a high initial cost iii. Skilled supervision is required in slow sand filter Which of the above statement is/are correct?
Consider the following statement. i. Slow sand filter is not flexible in variation in demand ii. The rapid sand filter is flexible in fluctuations in demand iii. The method of cleaning of a slow sand filter involves agitation and back-washing Which of the above statement is/are correct?
In cement bonded sand mold, sand mold material consists of what percentage of silica sand?