391 . A pressure of 25 m of head of water is equal to
  • A. 25 kN/m2
  • B. 245 kN/m2
  • C. 2500 kN/m2
  • D. 2.5kN/m2
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392 . The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by
  • A. TOD > BOD > COD
  • B. TOD > COD > BOD
  • C. BOD > COD > TOD
  • D. COD > BOD > TOD
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393 . Alum as a coagulant is found to be most effective when pH range of water is
  • A. 2 to 4
  • B. 4 to 6
  • C. 6 to 8
  • D. 8 to 10
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394 . The polluted water is one which
  • A. contains pathogenic bacteria
  • B. Consists of undesirable substances making it unfit for its best use i.e. drinking
  • C. is safe and suitable for drinking and domestic use
  • D. is contaminated
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395 . The devices which are installed for drawing water from the sources are called
  • A. aquifers
  • B. aquiclude
  • C. filters
  • D. intakes
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396 . If the average daily consumption of a city is 100,000 m3, the maximum daily consumption on peak hourly demand will be
  • A. 100000m3
  • B. 150000m3
  • C. 180000m3
  • D. 270000 m3
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397 . The population of a city in the first three continuous years is given as 6000,8000 and 10000 respectively. What is the population of the city in the fourth continuous year, according to the geometric increase method?
  • A. 11500
  • B. 12000
  • C. 12870
  • D. 14000
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398 . A 25 ml sample was diluted to 250ml with odourless distilled water so that the odour of the sample no longer perceivable. What was the Threshold odour number?
  • A. 11
  • B. 10
  • C. 25
  • D. 05
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399 . Zero hardness of water is achieved by
  • A. Using lime soda process
  • B. Excess lime treatment
  • C. lon exchange method
  • D. Using excess alum dosage
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400 . Which out of the following does not help in disinfecting water?
  • A. Filtration
  • B. Chlorine Tablets
  • C. Alums
  • D. Boiling
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401 . The activated sludge process is an
  • A. Aerobic attached growth system
  • B. Anaerobic attached growth system
  • C. Anaerobic suspended growth system
  • D. Aerobic suspended system
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402 . An electric filament bulb can be worked from
  • A. D.C. supply only
  • B. A.C. supply only
  • C. Battery supply only
  • D. All above
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403 . The property of fluid by virtue of which it offers resistance to shear is called
  • A. surface tension
  • B. adhesion
  • C. cohesion
  • D. viscosity
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404 . Choose the correct relationship
  • A. specific gravity = gravity x density
  • B. dynamicviscosity = kinematicviscosity x density
  • C. gravity = specific gravity x density
  • D. kinematicviscosity = dynamicviscosity x density
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405 . The stress developed on the material without any permanent set
  • A. Elastic limit
  • B. Yield stress
  • C. Ultimate stress
  • D. Breaking stress
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