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Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar

Environmental Engineering- I
Unit Wise Objectiv...
Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
c) Zoning
d) Logistic
12. Generally ____________...
Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
23. If degree of hardness is 3, then nature of w...
Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
c) Modern living
d) Metering system
36. The suit...
Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar

48.

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57...
Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
c) Electro-dialysis
d) Both b) and c)
59. Water ...
Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
a) contains pathogenic bacteria

b) consists of ...
Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
purposes, is_____________
a) 50 litres
b) 135 li...
Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
81. Water supply includes ______________________...
Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
Unit-II
1.

For design of flocculator the value ...
Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar

14.

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Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar

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Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
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49....
Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
53.

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62....
Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar

66.

67.

68.

69.

67.

c) Same
d) None of abo...
Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
d)
68.

69.

1

3

4

2

The purpose of aeration...
Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
a)
c)

TE (CIVIL) Div- A and B

b)
d)

Page 17
Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
Unit-III
1.

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Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
14.

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Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar

25.

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34...
Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
37.

Asbestos pipes are ________________________...
Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
Unit-IV
1.

9.

In pressure supply mains, water ...
Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
ii. Sluice valve
iii. Air valve
iv. Scour valves...
Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
a) Dead end
c) Circular
23.

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...
Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar

32.

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Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar
Unit-V
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For determining stora...
Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar

10.

11.

c) Cumulative losses
d) Both a) and b...
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Environmental engineering i objective questions (repaired)

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Environmental Engineering-I (Water Supply Engg.) - TE (CIVIL)
Course material by PROF S S JAHAGIRDAR, NKOCET, SOLAPUR.

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  1. 1. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar Environmental Engineering- I Unit Wise Objective Question Bank Unit-I 1. Indicator/s used in alkalinity test is/are _______________________. a) Phenolphthalein (PP) b) Methyl orange (MO) c) PP and MO d) None of these 2. The permissible limit of MPN for drinking water per 100 ml is _____________. a) 1 b) 10 c) 100 d) 1000 3. The indicator used in determination of chlorides is a) EBT b) Starch c) Potassium chromate d) MO 4. In DO test, titrant used is __________________. a) Sodium Thiosulphate b) Starch c) Buffer solution d) NaCl 5. The nature of end point in chloride test is ________________. a) Yellow to brick red b) White to yellow c) Red to yellow d) Blue to green 6. A condition that tends to increase corrosiveness of water on metals is _______. a) High DO content b) Low DO content c) Polyphosphate d) Low TDS 7. CO2 acidity is determined by using the indicator __________. a) PP b) MO c) Starch d) EBT 8. Design period of water works depends upon _____________. a) Funds availability b) Life of pipe material and other structural materials c) Rate of interest on loan taken to d) All of above complete the project 9. National board of fire under writers formula for estimating fire demand Q =4637 √P (1+ 0.01P) where P indicates ________________. a) Population b) Population in thousands c) Population in hundreds d) Population in Lakh 10. _____________ formula gives number of simultaneous fire streams. a) Buston’s b) MUD c) Kuichling’s d) Freeman’s 11. In _____________ method population growth of a small town or area is related to big towns or big areas. a) Ratio and correlation b) Graphical TE (CIVIL) Div- A and B Page 1
  2. 2. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar c) Zoning d) Logistic 12. Generally ______________ supply will reduce rate of demand. a) Continuous b) Intermittent c) Both a) and b) d) None of these 13. Algae and protozoa impart _____________ to water. a) Odour b) Colour c) Turbidity d) All of above 14. _____________ causes scaling in boilers. a) Hardness b) Colour c) Odour d) Taste 15. Fluoride upto ______________ ppm will prevent dental caries of the children. a) 1 b) 1.2 c) 1.5 d) 2.0 16. Phenols can impart ________________ to the water. a) Colour b) Turbidity c) Objectionable taste d) Hardness 17. As per IS-1172-1957, for cooking _______________ lit of water is required. a) 50 b) 100 c) 1 d) 5 18. As per Boston’s formula Q is expressed in _____________ a) m3/sec a) Lit/hr b) Lit/min c) lit 19. For calculating future population at the end of 30 years the value of ‘n’ in arithmetic mean method is _____________ a) 5 b) 30 c) 0.3 d) 3 20. If total hardness of water is greater than its total alkalinity, then the carbonate hardness will be equal to _______________________. a) Total alkalinity b) Total hardness c) Total hardness – total alkalinity d) Non carbonate hardness 21. Column A Column B (Laboratory tests) (Indicators) i) Alkalinity P) EBT ii) D.O Q) Starch iii) Hardness R) Potassium chromate iv) Chlorides S) MO and PP a) i) – S ii) – Q iii) – R iv) – P b ) i) – S ii) – Q iii) – P iv) – R c ) i) – Q ii) – S iii) – P iv) – R d ) i) – Q ii) – S iii) – R iv) – P 22. The unit of turbidity of water is __________________ a) JTU b) NTU d) All of above c) PPM TE (CIVIL) Div- A and B Page 2
  3. 3. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar 23. If degree of hardness is 3, then nature of water will be __________________ a) Extremely soft b) Very soft c) Soft water d) Hard water 24. As per Is-1172-1957, per capita demand for domestic purpose is _________ lpcd. a) 150 b) 135 c) 170 d) 130 25. The equation for Kuichling’s formula is given by __________________ a) Q = 3000 √P b) Q = 3182 √P c) Q = 3180 √P d) Q = 3181√P 26. Purpose of water treatment is ___________________________________. a) To remove odours b) To remove taste c) To kill pathogens d) All of above 27. BIS limit for residual chlorine at users end is _____mg/lit. a) 0.55 b) 0.5 c) 0.2 d) 1.0 28. If population of a town is 100 thousands, then by Buston’s formula, fire demand is _______ Lit/min. a) 31820 b) 3182 c) 5663 d) 56630 29. Procedure of adding 1 ml Manganous Sulphate and 1 ml Alkali Iodide Azide in 300 ml sample collected in BOD bottle is known as _____________________. a) Aeration b) De-aeration c) DO Fixation d) Solidification 30. _______ test is used for finding out optimum Alum dose. a) Char b) Ghar c) Jar d) None of these 31. In DO test, after DO fixation, white precipitate is obtained. Which means DO is ____________. a) Absent b) Present c) Saturated d) All of above 32. In DO test, after DO fixation, brown precipitate is obtained. Which means DO is ____________. a) Absent b) Present c) Saturated d) All of above 33. The most common cause of acidity in waters is ______________. a) Carbon dioxide b) Oxygen c) Hydrogen d) Nitrogen 34. Standard EDTA (Ethylene Diamine Tetra Acetic Acid) solution is used to determine__________________. a) Hardness in water b) Turbidity in water c) Dissolved oxygen in water d) Residual chlorine in water 35. Which of the following practices cause reduction in the per capita consumption? a) Good quality water b) Hotter climate TE (CIVIL) Div- A and B Page 3
  4. 4. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar c) Modern living d) Metering system 36. The suitable method for forecasting population for a young and a rapidly developing city is ________________________. a) Arithmetic mean method b) Geometric mean method c) Comparative graphical method d) None of these 37. The suitable method for forecasting population for a old and developed large city is ________________________. a) Arithmetic mean method b) Geometric mean method c) Comparative graphical method d) None of these 38. The devices installed for drawing water from different water sources are called _________________. a) Filters b) Intakes c) Outlets d) Inlets 39. Safe water is that water which does not contain ______________. a) Pathogenic bacteria b) Turbidity c) Any taste d) Any colour 40. The measure of the amount, to which light is absorbed or scattered by the suspended material in water is called _______________. a) Opacity b) Turbidity c) Clarity d) Diffraction 41. Turbidity meters working on principle of scattering of light are known as ___________. a) Spectrometers b) Nephelometer c) Tintometers d) Optimeters 42. The colour imparted to water because of suspended solids is ________________. 43. 44. 45. 46. 47. a) True colour b) Apparent colour c) colour d) none of these The colour imparted to water because of dissolved solids is ________________. a) Apparent colour b) True colour c) Colour d) Both b) and c) pH value of water indicates _____________________. a) Acidity b) Alkalinity c) Both a) and b) d) None of these Water having one unit lesser pH will be ___________________________. a) 1 time more acidic b) 10 times more acidic c) 100 times more acidic d) None of these Temporary hardness of water is caused by___________________________. a) Carbonates and bicarbonates of b) Bicarbonates of Sodium and Calcium and Magnesium Potassium c) Carbonates of Calcium and d) Dissolve CO2 Magnesium When fluoride concentration in water exceeds 1.5 mg/lit or more the disease that may be caused is ____________________________. TE (CIVIL) Div- A and B Page 4
  5. 5. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar 48. 49. 50. 51. 52. 53. 54. 55. 56. 57. 58. a) Methanemoglobinemia b) Fluorosis c) Dental carries in children d) Poliomyelitis Dental caries in children may be caused due to water supplies which are deficient in ____________. a) Calcium b) Iron c) Fluorides d) None ofthese Blue baby disease may be caused in infants due to drinking waters containing higher concentrations of _________________. a) Nitrites b) Nitrates c) Lead d) Arsenic The maximum safe permissible limit of chlorides in domestic water supplies is __________ mg/lit. a) 0.5 b) 100 c) 200 d) 1000 The total amount of dissolved salts present in the water can be easily determined by measuring _______________________________of water. a) Specific conductivity b) Electrical resistance c) Solids test d) All of above Chlorides are generally present in the water in the form of __________. a) KCl b) NaCl c) MgCl2 d) All of above Micro-organisms capable of causing diseases are known as _________________. a) aliens b) pathogens c) parasites d) none of these ________________ types of indicator micro organisms are used to detect presence of pathogenic bacteria. a) E-coli b) B-coli c) C- coli d) F-coli If alkalinity of coloured sample is to be determined, then ______________ shall be used during titration. a) PP b) MO c) pH meter d) both a) and b) A city supply includes ______________________________. a) Domestic water demand b) Industrial and commercial water demand c) Fire demand e) All of above d) Water losses The factor/s affecting per capita demand is/are __________________________. a) Size of city b) Climatic conditions c) Pressure in the mains e) All of above d) Cost of water ___________________ treatment reduces salinity of water. a) Flocculation b) Reverse osmosis TE (CIVIL) Div- A and B Page 5
  6. 6. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar c) Electro-dialysis d) Both b) and c) 59. Water having pH value 9, will have hydroxyl ion concentration, equal to _______. a) 109 b) 10-9 5 c) 10 d) 10-5 60. Water with having pH value 9, will have hydrogen ion concentration equal to ___. 61. 62. 63. 60. 61. 62. a) 9 mol/l b) 10-9 mol/l c) 109 mol/l d) None of these With increase in temperature specific conductivity of water _______________. a) Increases b) Decreases c) Remains same d) There is no such relation Electrical conductivity and Total dissolved solids are interrelated. The values of EC will ___________________________________________________________. a) Decrease with increase in TDS b) Increase with increase in TDS c) Deceases initially and increases d) All of above afterwards Column A Column B a. Absence of fluorides i. Methemoglobinemia b. Excess of lead ii. Goitre c. Presence of excess nitrates iii. Dental caries d. Absence of iodide iv. Anemia a b c d a) 3 4 2 1 b) 2 3 4 1 c) 3 4 1 2 d) 1 2 4 3 Column A Column B (Water Quality) (Method of determination) a. Hardness i. Winkler method b. Chlorine ii. EDTA method c. DO iii. Orthotolidine test d. Chloride iv. Mohr method a b c d a) 3 4 2 1 b) 2 3 1 4 c) 3 4 1 2 d) 1 2 4 3 The population of a town in three consecutive years are 5000, 7000 and 8400 respectively. The population of town in the fourth consecutive year according to geometric increase method is ____________ a) 9500 b) 9800 c) 10100 d) 10920 The polluted water is one which TE (CIVIL) Div- A and B Page 6
  7. 7. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar a) contains pathogenic bacteria b) consists of undesirable substances rendering it unfit for drinking and domestic use d) is contaminated c) is safe and suitable for drinking and domestic use 63. The dissolved oxygen level in natural unpolluted waters, at normal temperature is found to be of the order of_______ a) 1 mg/lit b) 10 mg/lit c) 100 mg/lit d) 1000 mg/lit 64. The most common cause of acidity in water is_____________ a) carbon dioxide b) oxygen c) hydrogen d) nitrogen 65. In a distribution system for population 2.5 lakhs the peak factor is considered as _____________ a) 2 b) 2.5 c) 3 d) 4 66. Multiplying factor, as applied to obtain the maximum daily water demand, in relation to the average, i.e. per capita daily demand is ______________ a) 1.5 b) 1.8 c) 3.0 d) 2.7 67. Design period for water supply projects is generally ______yrs. a) Less than 10 b) 20-30 c) 50 d) More than 50 68. Find population at the end of 2011 by arithmetical increase method Year Population 1951 1,00,000 1961 1,09,000 1971 1,16,000 1981 1,28,000 a) 1,26,000 b) 1,36,000 c) 1,46,000 d) 1,56,000 69. The most common cause of acidity of water is _________________. a) Oxygen b) Hydrogen c) Nitrogen d) Carbon dioxide 70. Water is considered as hard if its hardness is in the order of _________mg/lit as CaCO3 a) 50 b) 100 c) 150 d) Over 200 71. Dosage of alum is decided by ______________test. a) Hardness b) Chloride c) Jar d) Char 72. As per IS : 1172-1963, water required per head per day for average domestic TE (CIVIL) Div- A and B Page 7
  8. 8. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar purposes, is_____________ a) 50 litres b) 135 litres. c) 85 litres d) 65 litres 73. Pick up the correct statement from the following : a) Excess quantities of iron and b) Lead and barium salts have toxic manganese in water, cause effect discolouration of clothes c) Arsenic and selenium are e) All the above. poisonous to human health d) Higher copper content affects the lungs 74. If pH value of water is ________________________________ a) 7 water it is said to be neutral b) less than 7 it is said to be acidic c) more than 7 it is said to be d) all the above alkaline 75. Water supply system includes ______________________________________ a) digging a well for water b) construction of dams c) construction of canals d) entire arrangement from source to distribution 76. The population growth curve is _______________ a) S-shaped curve b) parabolic curve c) circular curve e) none of these d) straight line 77. Turbidity of raw water is a measure of ______________________ a) suspended solids b) acidity of water c) B.O.D. d) none of these 78. Water supply includes _______________________________________. a) collection, transportation and b) distribution of water to consumers treatment of water c) provision of hydrants for fire e) all the above fighting d) mains, sub-mains and branch lines of water supply 79. By boiling water, hardness can be removed if it is due to ______________ a) calcium sulphate b) magnesium sulphate c) calcium nitrate e) none of these d) calcium bicarbonate 80. The factor affecting per capita demand, is________________________ a) size of the city b) climatic conditions c) pressure in water mains e) All the above. d) cost of water TE (CIVIL) Div- A and B Page 8
  9. 9. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar 81. Water supply includes _______________________________________. f) collection, transportation and g) distribution of water to consumers treatment of water h) provision of hydrants for fire j) all the above fighting i) mains, sub-mains and branch lines of water supply 82. The fire demand of a city may be worked out by_____________________ a) Kuichling's formula b) Freeman formula c) Under Writers formula d) Bustan's formula e) All the above a) c) b) d) 83. TE (CIVIL) Div- A and B Page 9
  10. 10. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar Unit-II 1. For design of flocculator the value of G.t should be ___________. 2. a) 104 to 105 b) 100 to 1000 d) All of above c) 106 to 109 ______________ law is valid for laminar flow. a) Newton’s b) Stoke’s c) Reynolds’s d) Camp’s Cleaning interval for rapid sand filter bed is_____________. 3. 4. 5. 6. 7. 8. 9. 11. 12. 13. a) 3 – 4 months b) 6 – 8 months c) 1 – 2 year d) 24 hours Immediately after addition of Alum, __________ mixing is necessary. a) Gentle b) Rapid c) no d) None of these ___________________ is done to check growth of weeds, algae and bacteria in raw water. a) Post chlorination b) Double chlorination c) Pre chlorination d) De-chlorination For flow of 5 mld with detention period of 6 hrs, _________m3 of volume will be required for sedimentation tank. a) 1250 b) 1255 c) 1245 d) 1200 The amount of chlorine consumed in the oxidation of impurities, before any disinfection takes place is known as ____________________. a) Chlorine dose b) Residual chlorine c) Chlorine demand d) Free chlorine Chemical formula of Bleaching powder is __________. a) Ca(OCl)2 b) Ca(OCl) c) Ca(OH)2 d) Ca2(OCl) The film formed around media particle in slow sand filter is known as ________. a) Dirty skin b) Dirty thing c) Pure film d) skin 2 3 For flow of 15 mld with SOR 20 m /m /d, surface area of sedimentation tank is____m2. e) 750 f) 450 g) 650 h) 550 For ideal settling basin vs is settling velocity. If particle is having settling velocity (vs’) more than that of vs, then particle will removed with _____ efficiency. a) 100 % b) Less than 100 % c) 0 % (no removal) d) None of these In ___________ settling concentration of particles is less. a) Type IV TE (CIVIL) Div- A and B b) Type III Page 10
  11. 11. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. c) Type II d) Type I Unit of weir loading is _________________. a) Lit/m2/d b) Lit/m2/sec2 c) Lit/m/d d) Lit/d __________________ are compounds of ammonia and chlorine. a) Ozone b) CFC c) Chloramines d) All of above Period of cleaning interval for slow sand filter is ________. a) 1 to 2 months b) 1 to 2 yrs c) 1 to 2 days d) 1 to 2 hrs -1 Sec is unit of __________. a) Velocity gradient b) Detention period c) Power input d) Area of paddle The method of cleaning rapid sand filter is__________________. a) Scraping top layer b) Replacement of sand c) Backwashing d) All the above If the sedimentation tank is rectangular in shape having length L, width W and depth D, then for discharge (Q), the settling velocity of particle would be ________________. a) Q/ (W x D) b) Q / (L x W) c) Q / (D x L) d) Q / (L x W x D) Molecular formula for bleaching powder is ___________. a) ClO2 b) CaCl2 c) Ca(OH)2 d) Ca(OCl)2 Aeration of water is employed to remove __________ in form of precipitate. a) Iron b) Hardness d) Oxygen c) Alkalinity The disinfection by chlorination is most efficient at pH _________ a) 2.0 b) 5.0 c) 10.0 d) 7.0 Activated carbon can be used in water treatment for removing ___________ a) Colour b) Tastes and odours c) Turbidity d) All of above For slow sand filters period of cleaning is ______________ a) 1 to 2 days b) 1 to 2 years c) 1 to 2 months d) No cleaning is required __________________ is not a coagulant. a) Alum b) Chlorinated coppers c) Lime d) Sodium Aluminate _____________ sedimentation is concerned with the settling/removal of non flocculating, discrete particles from the water. a) Type – I b) Type – II TE (CIVIL) Div- A and B Page 11
  12. 12. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. 39. c) Type – III d) Type – IV _____________ type of filter requires large area. a) Slow sand b) Rapid sand c) Vaccume d) None of these _____________ means removal of excess chlorine from water. a) Pre-chlorination b) Post chlorination c) De-chlorination d) Break point chlorination _____________ does not cause permanent hardness. a) Calcium sulphate b) Calcium bicarbonate c) Magnesium sulphate d) Calcium chloride Aerator removes __________________ a) Silt b) Taste and odour c) Sand d) Flocs In case of flocculator ‘G’ means __________________ a) Power dissipated b) Specific gravity c) Velocity gradient d) Viscosity In rapid sand filters the permissible head loss is __________________ a) Between 2.5 and 3.5 m b) Exactly 2.5 m c) Less than 5 m d) All of above Period of clearing for slow sand filter is __________________ a) 15 days b) 2 to 3 days c) 6 months d) 1 to 2 months Stokes law is applicable for Reynolds number when Re __________________ a) More than 5 b) Greater than one c) Equal to ten d) Less than one Temporary hardness can be removed by __________________ a) Aeration b) Boiling c) Co-agulation d) Freezing Air diffusion is a type of ____________ system. a) Chlorination b) Flocculation c) Aeration d) Sedimentation Settling tank efficiency is reduced by ___________. a) Eddy currents b) Surface currents c) Vertical convection d) All of above 3 For a rectangular tank L x B x H is 5 x 4 x 3 m and design discharge is 600 m3/d. Hence, SOR will be ______________. a) 40 m3/m2/d b) 50 m3/m2/d c) 30 m3/m2/d d) 20 m3/m2/d In case of rapid sand filters ___________ formula is used for estimation of sand depth. a) Hudson b) Chezy’s c) Manning’s d) Hardy’s TE (CIVIL) Div- A and B Page 12
  13. 13. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar 40. 41. 42. 43. 44. 45. 46. 47. 48. 49. 50. 51. 52. The requirement of residual chlorine ________________ with decrease in temperature and increase in pH. a) Does not changes b) Decreases c) Both a) and b) d) increases Zeolites can be regenerated by passing a solution of ___________. a) Sugar b) Salt c) Wine d) All of above The process in which chlorination is done beyond break point is______________. a) Pre chlorination b) Super chlorination c) Post chlorination d) Break point chlorination The effective size of sand particles used in slow sand filter is __________ mm. a) 0.20 to 0.35 b) 0.35 to 0.6 c) 0.6 to 1 d) 1 to 1.80 If in a sedimentation tank, volume of tank is 20 m x 10 m x 3 m and flow rate is 3600m3/d, then detention time will be ____________hr a) 4 b) 6 c) 3 d) 2 The efficiency of sediments removal in sedimentation tank does not depends upon ___________________. a) Discharge through the tank b) Width of the tank c) Length of the tank d) Depth of the tank The most widely used coagulant in water treatment is ____________________. a) Lime soda b) Alum c) Ferrous sulphate d) Chlorinated copperas A clariflocculator is a ___________________________. a) Plain sedimentation unit b) Aeration unit c) Coagulation –sedimentation unit d) None of the above Cleaning of slow sand filter is done by ______________. a) Scrapping and removal of sand b) Back washing c) Any of above d) None of above Cleaning of rapid sand filter is done by ______________. a) Scrapping and removal of sand b) Back washing c) Any of above d) None of above Disinfection of water helps in _____________________________. a) Removing turbidity b) Removing hardness d) Complete sterilization c) Killing pathogenic bacteria Chlorine demand of water is equal to __________________________. a) Applied chlorine b) Residual chlorine c) a) –b) d) a) + b) Which of the following compound can be used for chlorination of water? a) Carbon dioxide b) Bleaching powder c) Alum d) All of above TE (CIVIL) Div- A and B Page 13
  14. 14. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar 53. 54. 55. 56. 57. 58. 59. 60. 61. 62. 63. 64. 65. The process of desalination of water, which makes use of micro-porous membrane, is _______________________. a) Electrodialysis b) Solar distillation c) Freezing d) None of above ________________ as a disinfectant leaves behind residuals. a) UV light b) Lime c) Chlorine d) All of above ________________ as a disinfectant does not leaves behind residuals. e) UV light f) Chlorine dioxide g) Chlorine h) Bleaching powder The process of passing the water through beds of granular materials is called _______________. a) Screening b) Sedimentation c) Filtration d) Disinfection Chlorination ofwater does not remove __________________________________. a) Ammonia content b) BOD c) Organic matter content d) DO The ratio of discharge and plan area in continuous flow type sedimentation tank is known as _________________________. a) Surface overflow rate b) Weir loading c) Volumetric loading rate d) All of above Wash water troughs are provided in ______________________. a) Rapid sand filter b) Flocculator c) Aerator d) Sedimentation tank In rapid sand filter air binding is caused due to ________________. a) Negative pressure b) Pressure c) Turbidity d) All of above Raw water treated only by chlorine is known as _________________. a) De-chlorination b) Pre-chlorination c) Super-chlorination d) All of above To control growth of algae in reservoirs following chemical is used ___________. a) Bleaching powder b) Copper sulphate c) HCl d) None of these Type II settling in water treatment is defined a ______________________________. a) Settling of discrete particles in b) Settling of flocculent particles dilute suspensions in dilute suspensions c) Settling of flocculent particles in d) Settling of particles in sludge concentrated suspensions blanket Air binding phenomena in rapid sand filter may occur due to ______________. a) Excessive negative pressure b) Mud ball formation c) Higher turbidity in the effluent d) Low temperature At lower pH values of water, the contact period required for chlorination is _______. a) Lower b) Higher TE (CIVIL) Div- A and B Page 14
  15. 15. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar 66. 67. 68. 69. 67. c) Same d) None of above Disinfection efficiency of chlorine treatment______________________________. a) Is decreased at higher pH values of b) Is increased at higher pH water values of water c) Is unaffected at higher pH values of d) Is highest at pH 7 water A river is the source of water for water supply scheme to a town. Its water is very turbid and polluted. The correct sequence of steps for treating the river water would be ______________________________________________________________. a) Presedimentation  b) coagulation sedimentation  prechlorination coagulation post chlorination sedimentation filtration  post chlorination c) sedimentation  post chlorination d) coagulation sedimentation filtration  post chlorination The various treatment processes are listed below 1. Filtration 2. Chlorination 3. Sedimentation 4. Coagulation 5. Flocculation The correct sequence of these processes in water treatment is _______________________. a) 1,2,3,4,5 b) 4,5,3,1,2 c) 2,3,1,5,4 d) 1,2,5,4,3 Column A Column B a. Aerator i. excess CO2 and H2S removal b. rapid sand filter ii. Settleable and colloidal matter c. slow sand filter iii. Suspended matter d. sedimentation tank iv. Suspended colloidal and bacteriological matter a b c d a) 3 4 2 1 b) 2 3 4 1 c) 3 4 1 2 d) 1 3 4 2 Column A Column B a. Air binding i. Changes effective size of b. Mud deposition sand c. Cracking of bed ii. Mud penetrates deeper inside d. Sand incrustation the bed iii. Mounds and balls of mud are formed in the bed iv. air and gases get locked in the bed a b c d a) 4 3 2 1 b) 2 3 4 1 c) 3 4 1 2 TE (CIVIL) Div- A and B Page 15
  16. 16. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar d) 68. 69. 1 3 4 2 The purpose of aeration used in water treatment is ___________ a) To reduce corrosion to water pipes b) To remove iron and manganese c) remove hydrogen sulphide d) All the above Coagulation is generally adopted, when turbidity of water is greater than ____________ mg/L. a) 50 c) 40 b) 60 d) 100 70. Strokes law is applied in design of ____________ treatment unit. a) Coagulation b) Filtration c) Sedimentation d) Aeration 71. In sedimentation process Type – I sedimentation is also called as ________ a) Discrete settling b) Hindered settling c) Zone settling d) Compression settling Rate of filtration for slow sand filter is _____ lit/hr/m2 a) 100-200 b) 500-1000 c) 3000-6000 d) All of above The effective size of sand particles used in slow filter is ___________. a) 0.25 to 0.35 mm b) 0.35 mm to 0.60 mm c) 0.60 to 1 mm d) 1.00 to 1.80 mm The settling velocity of inorganic particles is less than 0.1 mm dia. varies with the dia. (d), in proportion ____________. a) d3 b) d2 c) d d) None of above Surface loading or overflow rate of sedimentation tank, passing a discharge Q, and having length = L, depth= D and width = B is given by_________. a) Q/BD b) Q/BL c) QBD d) Q/BDL Cleaning of slow sand filter is done by ________________. a) Scrapping and removal of sand b) Back washing c) Any of above d) None ofthese Odour and taste is controlled by __________ a) Aeration b) Coagulation c) Disinfection d) Softening process Pick up the correct statement from the following :________________________ a) Detention period for plain b) Detention period for sedimentation tanks ranges between sedimentation tanks, using 4 to 8 hours coagulants usually ranges between 2 to 4 hours c) The horizontally flow velocity in d) All the above. sedimentation tanks, is generally limited to 0.3 m/minute 72. 73. 74. 75. 76. 77. 78. 79. TE (CIVIL) Div- A and B Page 16
  17. 17. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar a) c) TE (CIVIL) Div- A and B b) d) Page 17
  18. 18. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar Unit-III 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. The value of ‘a’ in the equation to find economic diameter D = a√ Q is a) 1 b) 1.5 c) 2 d) 2.5 NP-1 is a class of ______________ type of pipe a) C.I. b) Cement concrete c) Steel d) none of these Spacing of bars in thrust block is restricted to _____________ mm C/C. a) 400 b) 500 c) 700 d) 1000 Minimum residual pressure at ferrule points for two storey building is _________ m. a) 7 b) 10 c) 12 d) 17 Thrust block is designed for a minimum factor of safety of_________. a) 0.5 b) 1 c) 2 d) 4 ______________ pipes are free from corrosion. a) Steel b) C.I. c) Wrought Iron d) PVC _____________ is constituent of Asbestos cement pipe. a) Sand b) Lime c) Portland cement d) Iron Modulus of elasticity for CI pipe is _____________ Kg/m2 a) 7.5×109 b) 7.5×106 c) 7.5×1010 d) 7.5×105 2 _____________ Kg/cm pressure is required in distribution system for buildings above 10 storeys. a) 5.5 b) 7 c) 8 d) 5.5. to 7 Minimum residual pressure for three storey building is _____________ a) 7 m b) 12 m c) 17 m d) 25 m Economic diameter of pumping main is given by __________________ a) D = a √Q b) D = aQ2 2/3 d) D = aQ c) D = aQ Cast iron pipes are cast in generally __________________ meters. a) 10 to 15 b) 20 to 25 c) 3 to 6 d) 100 to 200 Minimum residual pressure required for single storey building is_______. a) 12 m b) 15 m c) 7 m d) 10 m TE (CIVIL) Div- A and B Page 18
  19. 19. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. Minimum size of pipe for a town with population above 50,000 is __________________ diameter. a) 150 mm b) 100 mm c) 250 mm d) 500 mm Velocity of sound in water is ____________m/sec. a) 1433 b) 1432 c) 1431 d) 1436 Corrosion is ____________________________ process. a) Electromagnetic b) Electrostatic c) Electrodynamic d) Electrochemical _____________________ types of pipes are free from corrosion. a) Plastic b) Steel c) CI d) None of these Pressure pipes are exclusively used for carrying water supplies because _______________________________________________________________. a) Such pipes are closed and hence b) Since water runs under high not exposed to pollution pressure in these pipes, anywhere. pollutants from outside cannot get entry, even if some joints are loose c) Such pipes can go up and down d) All of above the hills and valleys, thus requiring lesser depth for laying the pipes Hoop stress in the water pipe is caused by __________________________. a) Internal water pressure b) Water hammer pressure c) Traffic load d) All of above Water hammer pressure can be reduced by ___________________________. a) Rapid closing of valve b) Slow closing of valve c) Closing the valves in critical time d) None of these Modulus of elasticity of steel pipe is __________kg/m2. a) 2.1 x 1010 b) 2.1 x 1011 11 15 c) 2.1 x 10 d) 2.1 x 10 The water hammer pressure developed in a pipe will be __________________, if time of closure of valve is greater than critical time Tc. a) Lesser than ph max b) Greater than ph max c) Equal to ph max d) None of these The water hammer pressure developed in a pipe will be _________________, if time of closure of valve is lesser than critical time Tc. a) Lesser than ph max b) Greater than ph max c) Equal to ph max d) None of these The water hammer pressure developed in a pipe will be _________________, if time of closure of valve is equal to critical time Tc. a) Lesser than ph max b) Greater than ph max TE (CIVIL) Div- A and B Page 19
  20. 20. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. c) Equal to ph max d) None of these To compensate water hammer pressure ______________________ are provided. a) Surge tank b) Sedimentation tanks c) Merge tanks d) Intz tank Anchorages in the pipe network are provided _________________________. a) At all bends b) At other points of unbalanced pressure d) All of above c) At all steep slopes LA class of pipe will be found in ___________ pipes. a) Steel b) Copper c) Cast iron d) PVC DI-K14 pipes are available in the form of ____________ a) socket b) spigot c) screwed d) welded flange Graphite is most noble comparing to _____________ a) gold b) platinum c) copper d) both a) and b) Minimum surface reinforcement required in the thrust block is ______ kg/m2. a) 2 b) 3 c) 5 d) 9 For a discharge of 4 m3/s the economic diameter of pumping main will be__________ mm. a) 1000 b) 2000 c) 4000 d) 5000 The minimum residual pressure for single storey building is __________ a) 5 m b) 7 m c) 10 m d) 15 m Modulus of elasticity of CI pipe is _________kg/m2. a) 7.5 x 109 b) 7.5 x 106 c) 7.5 x 108 d) 7.5 x 105 The value of coefficient of expansion (α)for conduits per 0C may be taken as ______________ for steel. a) 11.5 x 10-6 b) 7.5 x 10-6 c) 10 x 10-6 d) None of above The corrosion in pipe is due to ________________. a) DO in water b) pH of water c) Impurities in the material d) All of above particularly those having a lower potential Corrosion of a pipe _____________________________________ a) reduces its life span b) reduces its carrying capacity c) adds colour to water e) all the above d) adds odour to water TE (CIVIL) Div- A and B Page 20
  21. 21. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar 37. Asbestos pipes are ___________________________________________________ a) light in weight and easy to b) highly resistant to corrosion transport c) high flexible to accommodate e) all the above deflection upto 12° d) very much smooth and hydraulically efficient 38. a) c) TE (CIVIL) Div- A and B b) d) Page 21
  22. 22. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar Unit-IV 1. 9. In pressure supply mains, water hammer pressure is reduced providing__________________. a) sluice valve b) air valve c) pressure relief values d) none of these In equation of hf = K.Gn the value of ‘n’ for Hazen William’s formula is____. a) 1.85 b) 1.81 c) 1.7 d) 1.0 Washout valves are provided at ___________ points in the mains. a) Highest b) Lowest c) Summit d) All the above Reflux valve is also known as _______________ valve. a) gate b) Check c) scour d) sluice Loss of head is minimum in ___________ system. a) dead end b) recticulation c) circular d) radial The value of coefficient of friction (f) for laminar flow is _____________ a) 64 × Re b) Re/64 b) Re c) 64 The value of Manning’s ‘n’ for brass and glass pipe is ___________ a) 0.009 to 0.013 b) 0.010 to 0.012 c) 0.011 to 0.014 d) 0.016 to 0.020 Check valve is also known as ______________ a) Reflux valve b) Non-return valve c) Both a) and b) d) None of these Summits are the points of ____________ pressure. 10. a) High c) Equal Match the pairs 2. 3. 4. 5. 6. 7. 8. Column A i. Gate valve ii. Air relief valve iii. Reflux valve iv. Safety valves 11. i – Q, ii – R, iii – S, iv – P b i – Q, ii – R, iii – P, iv – S Match the pairs Column A i. Check valve TE (CIVIL) Div- A and B by b) Low d) None of these Column B P) located at high pressure points Q) Used to shut off the supplies R) To provide exit for accumulated air S) Allows water to flow in one direction i – R, ii – Q, iii – P, iv – S i – Q, ii – P, iii – R, iv – S Column B P) To remove silt in pipe line Page 22
  23. 23. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar ii. Sluice valve iii. Air valve iv. Scour valves 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. Q) To check water flow in one direction R) To control flow of water through pipe line S) To release accumulated air i – Q, ii – R, iii – S, iv – P i – R, ii – Q, iii – P, iv – S i – Q, ii – R, iii – P, iv – S i – Q, ii – P, iii – R, iv – S Storage capacity of distribution reservoir is determined by _____________ a) Hydrograph method b) Mass curve method c) Log curve method d) Both (a) and (b) In case of minor losses value of ‘K’ for 90° elbow is _____________ a) 0.5 b) 1.0 c) 0.5 to 1.0 d) 0.05 Air relief valves are provided at the __________________ along water pipe. a) Summits b) Sag c) Mid-point d) None of the above Reflux valves are also known as __________________ valves. a) Sluice b) Check c) Non-return d) Both b and c In Hazen William’s formula, the coefficient C depends upon __________________. a) Pipe material b) Age of pipe c) Diameter of pipe d) All of above The value of Manning’s ‘n’ for concrete pipe with rough joints is __________________. a) 0.016 to 0.017 b) 0.009 to 0.013 c) 0.010 to 0.012 d) 0.50 to 1.5 For well planned cities __________________ type of distribution system is used. a) Dead end b) Grid-iron c) Circular d) Radial Stagnation of water occurs in __________________ system. a) Radial b) Grid iron c) Circular d) Dead end Reflux valves are also known as ______________ valves. a) Shut off b) Check c) Cut off d) Air relief To obtain value of friction factor ______________ charts are commonly used. a) Manning’s b) Moody’s c) Noody’s d) Chezy’s The value of k in equation hm = k x (V2/2g) for entrance is _____________. a) 0.6 b) 0.4 c) 0.5 d) 0.7 Radial system is reverse of ___________ system. TE (CIVIL) Div- A and B Page 23
  24. 24. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar a) Dead end c) Circular 23. 24. 25. 26. 27. 28. 29. 30. b) Grid Iron d) All of above The valve which allows flow in one direction is ___________________. a) Reflux b) Sluice c) Gate valve d) None of these A blow off valve is provided in water distribution system at ________________. a) Low points b) High points c) Junction points d) All of above Pressure relief valves installed along water mains are provided for relieving ____________________. a) Air pressure b) Water hammer pressure c) Ice pressure d) All of above The suitable layout for a water supply distribution system for irregularly grown city is _________________________. a) Dead end system b) Grid iron system c) Ring system d) Radial system The suitable layout for a water supply distribution system for well planned city with rectangular road pattern is ___________________ a) Dead end system b) Grid iron system c) Ring system d) Radial system In Hardy-Cross method more the number of iterations (trials), ___________ is the correction in discharge (ΔQ). a) More b) Constant c) Multiple d) Lesser and accurate ______________________________ method/methods is/are used for analysis of pipe network. a) Hardy cross b) Newton-Raphson c) Linear Theory d) All of above Match the pairs Column A i. Dead end system ii. Grid iron system iii. Ring system iv. Radial system 31. Column B P) Equal pressures and multiple flow paths Q) Both economy and reasonably equal pressures R) Economy and simplicity S) zonal distribution i – Q, ii – R, iii – S, iv – P b . i – R, ii – P, iii – Q, iv – S i – Q, ii – R, iii – P, iv – S i – Q, ii – P, iii – R, iv – S In a pipe network ABCD (including common pipe AC) of 5 pipes, which of the following statement is true? a) Correction is applied twice (Two b) Only one Correction is applied times) to pipe AC to pipe AC c) No correction is applied to pipe d) Correction is neglected for pipe TE (CIVIL) Div- A and B Page 24
  25. 25. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar 32. 33. 34. 35. 36. 37. 38. 39. 40. 41. AC AC Reflux valve is also known as ____________ valve. a) gate b) check c) scour d) sluice Intermittent system of supply will require large no. of valves. This statement is _____________ a) True b) False c) Can’t say d) Hypothetical Loss of head is minimum in _____________ system. a) dead end b) reticulation c) circular d) radial Pumping system is best suited when ____________________________ a) Fire accidents occurs frequently b) Source of water is at low level c) Density of population is high and d) Power failure are more space available is less common An Advantage of intermittent system of supply is ______________________. a) It is economical b) Supply is assured during fire accidents c) Pumping is for limited period d) Repairs can be carried out during non supply hours Distribution system in which, mains, submains and branches are connected with each other is ___________________. a) Tree system b) Grid iron system c) Radial system d) None The valve used for controlling the flow is ______________. a) Sluice valve b) Check valve c) Scour valve d) Pressure relief valve Scour valve in a water distribution system is provided at _____________. a) Low points b) High points c) Junction points d) All of above In pressure supply mains, water hammer pressure is reduced by providing______ a) sluice valves b) air valves c) pressure relief valves d) none of the these In distribution pipes, drain valves are provided at _______________ a) lower point b) higher point c) junction points d) any where. 42. e) g) f) h) a) c) b) d) 43. TE (CIVIL) Div- A and B Page 25
  26. 26. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar Unit-V 1. 2. 3. 4. 5. For determining storage capacity of reservoirs ______________ equation is used. a) McDonald b) McDermott c) McMillan d) None of these To absorb the hourly variation in demand ______________ type of reservoirs are provided. a) Sedimentation b) Filtration c) Penetration d) Distribution Total Capacity of distribution reservoir is _______________________________. a) Balancing reserve b) Fire reserve c) Break down reserve d) Sum of a), b) and c) In McDonalds formula, coefficients a and b are ____ and _____ respectively a) 0.2, 0.1 b) 0.2, 0.3 c) 0.4, 0.5 d) 0.1, 0.4 In hydrograph method, balancing capacity of the reservoir is ___________. a) Area above or below average b) Maximum ordinate pumping line c) Sum of maximum ordinate d) All of above 6. Cumulative supply and demand Demand Curve A Supply line B 7. 8. 9. Time in hrs  In above graph, balancing capacity of reservoir is given by___________________. a) A+B b) A-B c) B-A d) Max of A or B In hydrograph method, capacity of reservoir can be calculated by _____________ formula. a) Trapezoidal b) Simpson’s c) Both a) and b) d) None of these One of the following type of method may give error while determining balancing capacity. a) Analytical b) Graphical c) Both a) and b) d) None of these While determining balancing capacity of distribution reservoir, in graphical method ____________________________________________is plotted on Y-axis. a) Cumulative demand b) Cumulative supply or pumping TE (CIVIL) Div- A and B Page 26
  27. 27. Environmental Engineering-I Objective Question Bank - Prof S S Jahagirdar 10. 11. c) Cumulative losses d) Both a) and b) While determining balancing capacity of distribution reservoir, in graphical method ______is plotted on X-axis. a) Discharge in lit b) Time in hrs c) Time in days d) Time in months The storage capacity of reservoir can be found out by ______________ a) Heytograph c) Mass curve b) Flow frequency curve d) All of above a) c) b) d) 12. TE (CIVIL) Div- A and B Page 27

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