Environmental (321-332)

Updated: Apr 27, 2020

321. Phosphorus can be removed from waste water by ferric chloride addition


322. Which of the following compounds does not provide free chloride ? NHCI


a) Both A and R are true and R is the

correct explanation of A

b) Both A and R are true but R is not the

correct explanation of A

c) A is true but R isfalse

d) A isfalse but R is true.


323. Assertion A : Alum or aluminum sulphate is widely used for the purpose of

flocculation in water treatment.

Reason R : It is effective even in the absence of alkalinity in the raw water



324. Assertion A : Microbiological examinations of water samples are usually based

on tests for the detection and enumeration of indicator organisms rather than of


Reason R : The identification of pathogens in water is both extremely time

consuming and difficult



325. Assertion A : Tapered flocculation is more efficient when compared to the

conventional process of flocculation.

Reason R : In tapered flocculation,velocity gradient at the inlet is less than

that at the outlet of the flocculation unit



326. Assertion A : In wastewater treatment, waste stabilization ponds are more

successful in sunny tropical regions.

Reason R : The bacterial action of purification is achieved through photo

synthetic bacteria.



327. Assertion A : Presence of E-coli bacteria in water indicates that the water is

polluted with facal discharge.

Reason R : E-coli is a pathogenic bacteria.



328. Assertion A : Ozone is not widely used in community water supplies.

Reason R : It is not possible to maintain residual concentration of ozone in water

after the disinfection process.



329. Assertion A : In the case of dual media filter, the rate of fiIteration is more than that of rapid sand filter.

Reason R : The direction of flow is from fine medium to coarse medium



330. Assertion A ,: Horizontal velocity of flow through grit chambers is maintained

between 24 to 30 cm/sec.

Reason R : Removal of organic and inorganic particles larger than O.l mm

direction is very essential



331. Assertion A : At the ferrule point of a water supply distribution pipe network for Indian towns having a majority of two storey buildings, the ideal minimum

pressure head of water is 12 m.

Reason R : This magnitude of pressure head at ferrule is necessary to reach the

highest floor of the two-storey buildings



332. Assertion A : Sanitary landfills can no longer be used for the disposal of solid

wastes in India.

Reason R : The leachates from sanitary landfills may pollute the ground water


14 views0 comments

Recent Posts

See All

साधारण समझ में सीमेंट एक बंधक पदार्थ (Binding material) है। Cement एक प्रकार का संसजन और असंजन (Cohession & adhesion) गुणों वाला बंधक पदार्थ है। जो ठोस के कणों को अपने साथ-2 बांधने में सक्षम होता है।