Related Questions

BOD of raw municipal sewage may be in the range of about __________ mg/litre.
A 1-2
B 5-10
C 150-300
D 2000-3000
একটি ড্রেন থেকে 1000 mL ময়লা পানি সংগ্রহ করে তার COD নির্ণয়ের জন্য DO পরিমাণ করতে গিয়ে দেখা গেল 50 mL নমুনা পানির জন্য 0.015 N Na2S2O3  দ্রবণের 10mL লেগেছে। ঐ নমুনা পানিতে H2SO4 ও         K2Cr2O7 যোগ করার 3 ঘণ্টা পর পুনরায় DO নির্ণয় করতে গিয়ে দেখা গেল এর 50 mL পানির জন্য    0.15 N Na2S2O3 দ্রবণের 3.5 mL লেগেছে। ঐ নমুনা পানির COD গণনা কর।
A 15.6 ppm
B 17.6 ppm
C 19.6ppm
D 21.6ppm
The price of raw meterials had gone up by 15% labor cost has also increased from 25% of the cost of ras material to 30% of the cost of raw material. By how much percentage should there be reduction in the usage of raw materials so as to keep the cost same?
A 28%
B 17%
C 27%
D 24%
During sewage treatment, the sewage is subjected to __________ treatment in Imhoff tank.
A Filtration
B Digestion
C Sedimentation
D Both B and C
Fine grit present in sewage is removed in the __________ during sewage treatment.
A Grit chamber
B Detritus tank
C Trickling filter
D Skimming tank
__________ substances present in sewage are removed in grit chamber during sewage treatment.
A Organic
B Fatty
C Inorganic
D Dissolved
The inventory of raw materials included in the working capital is usually about __________ months supply of raw materials valued at delivery prices.
A One
B Three
C Six
D Twelve
Most easily and cheaply available fibrous raw material for paper manufacture available in India is bamboo. The yield of pulp produced from fibrous raw material by mechanical process is about __________ percent.
A 75
B > 30
C 50
Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is?
A Centrifugal pump
B Pneumatic ejector
C Reciprocating pump
D None of these
Main component of sewage gas produced during aneorobic decomposition of organic waste (by suitable bacteria) during sewage disposal is
A H2
B CH4
C CO2
D N2

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