Waste Water Characteristics

WASTE WATER CHARACTERISTICS
Q1. Organic matter which can be decomposed by bacteria is known as

(A) biodegradable organic matter
(B) degradation
(C) eutrophication
(D) decomposers
(OPSC 2019 CE Paper II)
Q2. Standard BOD is taken for

(A) 1 day (B) 3 days
(C) 5 days (D) 9 days
(WBPSC AE 2016)
Q3. BOD is measure of

(A) all organics
(B) all inorganic
(C) biodegradable organics
(D) non-biodegradable organics
(WBPSC AE 2016)
Q4. Which of the following is the minimum limit (ppm) of the dissolved oxygen
that must be in the water survival of aquatic life ?
(A) 1 (B) 4 (C) 10 (D) 40
(SSC JE 2007-18)
Q5. A stream has flow of 20 cumecs and BOD concentration of 10 mg/l receives
the industrial waste water having flow of 1.5 cumecs and BOD concentration of
250 mg/l . What is the BOD concentration (mg/l) of stream at downstream point
of meeting of stream with industrial waste?
(A) 2.67 (B) 12.09 (C) 13 (D) 26.74
(SSC JE 2007-18)
Q6. Pollution potential of domestic sewage generated in a town and its industrial
sewage can be compared with reference to
(A) their BOD value (B) population equivalent
(C) their volume (D) the relative density
Q7. The standard 5-day BOD at 20ºC, when compared to ultimate BOD is about
(A) 60% (B) 68% (C) 80% (D) 90%

(SSC JE-2014)
Q8. BOD test is conducted at a temperature of:

(A) ambient temperature (B) 15º C
(C) 20ºC (D) 27ºC
(SSC JE 2014)
Q9. The correct graphical representation of BOD (Y) and time (t) is given by
(A) (B)
(C) (D)
(SSC JE 2007-18)
Q10. If the free dissolved oxygen is not available to the sewage, then the
anaerobic decomposition is called
(A) denitrification
(B) biodegradation
(C) filtration
(D) putrefaction
(JKSSB JE 2021)
Q11. When the sewage of concentration Cs flow at the rate of Qs into a river
stream with concentration Cr flowing at the rate of Qr the concentration C of the
resulting mixture is given by the expression?
(A) C= CsQs+CrQr / QsQr+CrQ
(B) C= CsQs / Qs+Qr
(C) C = CsQs / QsQr+CrQr
(D) C = CsQs+CrQr / Qs+Qr
(JKSSB JE 2021)
Q12. The process to counterbalance the consumption of D.O due to the de-
oxygenation, atmosphere supplies oxygen to the water is called ______.
(A) De-oxygenation
(B) Re-oxygenation
(C) Self-purification
(D) Dilution
(JKSSB JE 2021)
Q13. What is the name of the solution which is used to measure the amount of
albuminoidal nitrogen present in the sewage?
(A) NH4 Cl
(B) K2 Cr2 O7
(C) NH4NO3
(D) KMnO4
(JKSSB JE 2021)
Q14. Eutrophication in water bodies are caused due to presence of high levels of
(A) nitrogen and phosphorous
(B) oxygen-demanding materials
(C) toxic organic substances
(D) heated water from industrial units
(WBPSC AE 2014)
Q15. If BOD of a wastewater sample is found as 180 mg/1 after 5 days at 20°C,
the BOD value for one day and at same temperature will be [assume K1 (base e)
= 0.23/day].
(A) 48 mg/l (B) 54 mg/1
(C) 94 mg/1 (D) 220 mg/1
(WBPSC AE 2012)
Q16. Bacteria which consume organic matter as a source of carbon and energy
are known as
(A) Photoautotrophic
(B) Photoheterotrophic
(C) Chemoheterotrophic
(D) Chemoautotrophic
(WBPSC AE 2012)
Q17. Biochemical oxygen demand of wastewater is a measure of

(A) total concentration of biochemical
(B) total concentration of organic matter
(C) concentration of biodegradable organic matter
(D) concentration of chemically oxidisable matter
(WBPSC AE 2007)
Q18. Self purification of natural streams is caused due to

(A) Dilution
(B) Turbulence of water
(C) Oxidation-reduction
(D) All the above
(WBPSC AE 2003)
Q19. Community Waste mostly liquid not containing excreta is specially termed
as
(A) Garbage
(B) Sewage
(C) Sewerage
(D) Sullage
(WBPSC AE 2003)
Q20. Sewage is
(A) Waste water from bath rooms
(B) Drainage from roads
(C) Waste water from kitchen
(D) Any waste water of domestic or industrial origin
(WBPSC AE 2003)
Q21. The quantity of liquid waste which flows in sewers during the period of
rainfall is known
(A) Sanitary sewage
(B) Industrial waste
(C) Storm sewage
(D) None of these
(WBPSC AE 2003)
Q22. Standrad B.O.D. is taken for

(A) 1 day (B) 2 days
(C) 3 days (D) 5 days
(WBPSC AE 2003)
Q23. An advantage of COD test over BOD test is
(A) It oxidizes all matter including toxins
(B) It cannot oxidize benzene, pyridine etc.
(C) It is relatively a quick process
(D) Biodegradable matter cannot be distinguished from the rest
(WBPSC AE 2003)
Q24. In waste water, the solids which end decomposed are

(A) Organic (B) Inorganic
(C) Domestic (D) Dissolved
(WBPSC AE 2001)
Q25. One of the usual parameters of pollution in domestic waste water is

(A) 3 day 20°C B.O.D
(B) 3 day 25°C B.O.D
(C) 5 day 20°C B.O.D
(D) 5 day 25°C B.O.D
(WBPSC AE 2001)
Q26. The oxygen sag curve exhibits an important characteristic given by a point
on the curve indicating
(A) Maximum D. O. deficit
(B) D.O. saturation concentration
(C) D. O. concentration
(D) No D. O. deficit
(WBPSC AE 2001)
Q27. The rate of deoxygenation in a river may be expressed as

(A) rD = – K. LO e – kt
(B) rD = LO e – kt
LO
rD =
(C) e−kt
e−kt
rD =
(D) LO
(WBPSC AE 2001)
Q28. In a town, garbage is produced at the rate of

(A) 150 gm
(B) 800 gm
(C) 450 gm
(D) 600 gm per head per day
(WBPSC AE 2001)
Q29. In a compost pit the decomposition of organic substances is mainly due to

the action of
(A) Heat
(B) Aerobic bacteria
(C) Anaerobic bacteria
(D) Facultative bacteria
(WBPSC AE 2001)
Q30. B.O.D. in water signifies presence of

(A) Total organic load
(B) Biodegradable organic load
(C) Non-biodegradable organic load
(D) Total load
(WBPSC AE 1998)
Q31. Sludge digestion produces gás with maximum content

(A) methane
(B) cabon dioxide
(C) Nitrogen
(D) Hydrogen sulphide
(WBPSC AE 1998)
Q32. Sludge drying beds are used to separate water from

(A) raw sludge
(B) primary raw sludge
(C) activated excess sludge
(D) digested sludge
(WBPSC AE 1998)
Q33. For typical untreated domestic waste water, B.O.D./C.O.D. ratio varies from
(A) 0.20 to 0.40
(B) 0.40 to 0.80
(C) 0.80 to 0.90
(D) 1.0 to 1.2
(WBPSC AE 1998)
Q34. A sample of water collected from a lake during day time was found to be
highly supersaturated with dissolved oxygen. The cause of this super saturation
could be
(A) intense aerobic bacterial activity
(B) release of oxygen from bottom deposits
(C) absence of organic pollution
(D) production of oxygen due to algal photosynthesis
(WBPSC AE 1998)
Q35. B.O.D of secondary effluent from an activated sludge plant normally will
be in the range of
(A) less than 30 mg/litre
(B) 35 to 50 mg/litre
(C) 75 to 100 mg/litre
(D) 100 to 125 mg/litre
(WBPSC AE 1998)
Q36. In the very first stage decompostion of organic matter in sewage

(A) Hydrogen sulphide is formed
(B) Carbon dioxide is formed
(C) Ammonia is formed
(D) Nitrates are formed
(WBPSC AE 1998)
Q37. As a result of sludge digestion a combustible gas is generated. The generated

gas is
(A) hydrogen
(B) marsh gas
(C) ammonia
(D) hydrogen sulphide
(WBPSC AE 1998)
Q38. The commonly used mathematical model relating the B.O.D. Exertion and
reaeration to dissolved oxygen deficit in a stream was first developed by
(A) Hazen and camp
(B) Eckenfelder and 'o' conor
(C) streeter and phelps
(D) none of the above
(WBPSC AE 1998)
Q39. What is the theoretical oxygen demand (mg/l) of a glucose solution of

concentration 500mg/l ?
(A) 250.33 (B) 380.65 (C) 533.33 (D) 650.21
(SSC JE 2007-2018)

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WASTE WATER CHARACTERISTICS

Q1. Organic matter which can be decomposed by bacteria is known as

Q2. Standard BOD is taken for

Q3. BOD is measure of

(A) 60% (B) 68% (C) 80% (D) 90%

Q8. BOD test is conducted at a temperature of:

Q17. Biochemical oxygen demand of wastewater is a measure of

Q18. Self purification of natural streams is caused due to

Q22. Standrad B.O.D. is taken for

Q24. In waste water, the solids which end decomposed are

Q25. One of the usual parameters of pollution in domestic waste water is

Q27. The rate of deoxygenation in a river may be expressed as

Q28. In a town, garbage is produced at the rate of

Q29. In a compost pit the decomposition of organic substances is mainly due to

Q30. B.O.D. in water signifies presence of

Q31. Sludge digestion produces gás with maximum content

Q32. Sludge drying beds are used to separate water from

Q36. In the very first stage decompostion of organic matter in sewage

Q37. As a result of sludge digestion a combustible gas is generated. The generated

Q39. What is the theoretical oxygen demand (mg/l) of a glucose solution of

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