Public Health Engineering (PHE)

CE5I

22504

Multiple Choice Questions (MCQs)
1   Aeration of water is done to remove
    (A)   Odour
    (B)   Colour
    (C)   Bacterias
    (D)   Turbidity
[showhide type=”button1″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
2   The maximum permissible nitrites in public water supplies, is
    (A)   Nil
    (B)   0.5 PPM
    (C)   1 PPM
    (D)   1.5 PPM
[showhide type=”button2″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
3   Chemical coagulation of drinking water, is done
    (A)   To settle suspended materials
    (B)   To increase rate of settlement of suspended materials
    (C)   To remove the bacteria
    (D)   None of these
[showhide type=”button3″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
4   Rapid gravity filters
    (A)   Were developed by G.W. Fuller
    (B)   Make use of coarser sand with effective size as 0.5 mm
    (C)   Yield as high as 30 times the yield of slow sand filters
    (D)   All the above
[showhide type=”button4″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
5   The detention period for plain sedimentation water tanks, is usually
    (A)   4 to 8 hours
    (B)   8 to 16 hours
    (C)   16 to 24 hours
    (D)   24 to 36 hours
[showhide type=”button5″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
6   Most satisfactory formula for an estimate of fire demand Q for a city of population P in thousands for Indian conditions, is
    (A)   Q = 1115 (p/5 + 20)
    (B)   Q = 1640 √P (1 – 0.01 √P)
    (C)   Q = 3180 √P
    (D)   None of these
[showhide type=”button6″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option C [/showhide]
7   After cleaning a slow sand filter, the filtered water is not used for
    (A)   6 hours to 12 hours
    (B)   12 hours to 18 hours
    (C)   18 hours to 24 hours
    (D)   24 hours to 36 hours
[showhide type=”button7″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
8   The best process of disinfection of public water supply, is by
    (A)   Boiling
    (B)   Chlorination
    (C)   Adding lime
    (D)   Adding ozone
[showhide type=”button8″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
9   When the reduced level of the water source is higher than the reduced level of the consumer’s place, water is generally supplied
    (A)   By pumping system
    (B)   By gravitational system
    (C)   Both (a) and (b)
    (D)   All the above
[showhide type=”button9″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
10   For the prediction of future population of a city, the factor to be considered, is
    (A)   Births
    (B)   Deaths
    (C)   Migrants
    (D)   All the above
[showhide type=”button10″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
11   A city supply includes
    (A)   Domestic water demand
    (B)   Industrial and commercial water demands
    (C)   Demand for public uses and fire
    (D)   All the above
[showhide type=”button11″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
12   Turbidity is the ability of water to
    (A)   Scatter light
    (B)   Retain suspended solids
    (C)   Retain colloidal solids in suspension
    (D)   Detain dissolved solids
[showhide type=”button12″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
13   Turbidity for domestic water is undesirable because it’s
    (A)   Is unaesthetic
    (B)   Causes change of taste
    (C)   Give apparent colour
    (D)   Prevents light penetration & hence photosynthesis
[showhide type=”button13″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
14   Higher pH for water is undesirable because
    (A)   It corrodes zinc, copper & lead pipes
    (B)   It includes sour taste
    (C)   It renders chlorination less effective
    (D)   It promotes growth of iron & sulphur bacteria
[showhide type=”button14″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option C [/showhide]
15   Presence of nitrogen in a waste water sample is due to the decomposition of
    (A)   Carbohydrates
    (B)   Proteins
    (C)   Fats
    (D)   Vitamins
[showhide type=”button15″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
16   More than 1mg/l of fluorides causes
    (A)   Dental caries
    (B)   Mottled enamel of teeth
    (C)   Skeletal fluorosis
    (D)   Prevent dental cavaties & tooth decay in children
[showhide type=”button16″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
17   A desirable feature of hardness is
    (A)   More soap consumed
    (B)   Skin roughened
    (C)   Vegetables toughened
    (D)   Scales formed inside pipes to protect them from corrosion
[showhide type=”button17″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
18   A factor affecting domestic demand of water is
    (A)   Dead end system or rectification of network of pipes
    (B)   Timing of water supply
    (C)   Water supplies is soft or hard
    (D)   Climatic conditions
[showhide type=”button18″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
19   For an old city with constraints for growth the best method of forecasting future population is
    (A)   Arthimatical increase method
    (B)   Geometrical increase method
    (C)   Graphical method
    (D)   Incremental increase method
[showhide type=”button19″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
20   Design period mainly depends on
    (A)   Percentage interest at which the loan is taken
    (B)   Capacity of the municipality to repay
    (C)   Quality of fittings used
    (D)   Rate of growth of population
[showhide type=”button20″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
21   A river intake may be situated on
    (A)   A straight reach
    (B)   The convex side of a curved course
    (C)   Downstream side of outfall sewer
    (D)   Proximity to industries
[showhide type=”button21″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
22   Sedimentation may not be required for water from a
    (A)   Shallow well
    (B)   Deep well
    (C)   River
    (D)   Canal
[showhide type=”button22″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
23   Permissible velocity through coarse screens is not greater than
    (A)   1m/s
    (B)   1m/min
    (C)   0.3 m/ s
    (D)   0.3 m/min
[showhide type=”button23″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
24   Coagulating power of a chemical increases with its
    (A)   Atomic weight
    (B)   Molecular weight
    (C)   Density
    (D)   Valency
[showhide type=”button24″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
25   Optimum dose of coagulant means the least dose that produces
    (A)   Maximum amount of floc
    (B)   Floc whose density is very high
    (C)   Max. Amount of floc within the least time
    (D)   Readily settleable floc
[showhide type=”button25″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
26   Schmutzdecke will be formed in
    (A)   Slow sand filters
    (B)   Rapid sand filters
    (C)   Pressure filters
    (D)   Both SSF & RSF
[showhide type=”button26″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
27   Backwashing is highly effective in case of
    (A)   SSF
    (B)   RSF
    (C)   Pressure filters
    (D)   Both RSF & SSF
[showhide type=”button27″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
28   Coagulant may not be added for treatment before
    (A)   Slow sand filter
    (B)   Rapid sand filter
    (C)   Pressure filter
    (D)   Both in RSF & SSF
[showhide type=”button28″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]

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