Practice Test: Question Set - 16
1. At break point of chlorination,
- (A) Chlorine
is used to oxidize
- (B) Residual
chloride is zero
- (C) Residual
chloride is maximum
- (D) Residual
chlorine reappears
2. 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 alkaline
- (D) All
the above
3. Dissolved carbon dioxide, can be removed from the supply main by
- (A) Sedimentation
- (B) Aeration
- (C) Chlorination
- (D) Coagulation
4. Grade aqueducts are not allowed to run
- (A) Full
- (B) ¾th full
- (C) ½ full
- (D) ¼th full
5. According to IS : 1172-1963, a minimum of 135 liters of water capita per day, is required for
- (A) Boarding
schools
- (B) Nurses
home and medical quarters
- (C) Hostels
- (D) All
the above
6. The temporary hardness of water can be removed by
- (A) Boiling
- (B) Adding lime
- (C) Adding
alum
- (D) Filtration
7. The level of underground water is called
- (A) Water
level
- (B) Water
table
- (C) Negative
level
- (D) Invert level
8. The period of cleaning of a slow sand filter, is usually
- (A) 5 to 10 days
- (B) Two
weeks to three weeks
- (C) One month to
three months
- (D) Three
months to six months
9. Specific yield of a well is
- (A) Quantity
of water than can be drawn from the well
- (B) Flow
of water per unit time
- (C) Total
quantity of water available in the well
- (D) Quantity
of water per unit time per unit draw-down
10. By adding 1 ml of Orthotolidine solution to 100 ml chlorinated water taken after contact period, the residual chlorine makes the color of solution
- (A) Yellowish
- (B) Greenish
- (C) Bluish
- (D) Reddish
11. Rapid gravity filter can only remove turbidity of water up to
- (A) 15 to 25
gm/liter
- (B) 25 to 30
gm/liter
- (C) 30 to 35
cm/liter
- (D) 35 to 40
gm/liter
12. In pumping stations, the type of joint generally used, is
- (A) Socket
and spigot joint
- (B) Flanged
joint
- (C) Expansion
joint
- (D) Dresser
coupling joint
13. Rapid sand filter
- (A) Should
be preceded by coagulation and sedimentation
- (B) Uses
rapid sand as filter media
- (C) Is
used after slow sand filtering has been done
- (D) Can
combine disinfection also
14. Pick up the incorrect statement from the following regarding fire hydrants
- (A) Fire
hydrants are fitted in water mains at 100 m to 150 m apart at fire
- (B) The minimum
water pressure hydrants, is kept 1.5 kg/cm2
- (C) The water at
pressure 1 to 1.5 kg/cm2 is made available for 4 to 5 hours for
constant use
- (D) None of
these
15. Pick up the correct statement from the following:
- (A) At
a particular speed of operation, the head produced decreases with the increase
of discharge
- (B) At
zero discharge, discharge valve remaining closed, the head developed is maximum
which is known as shut-off head
- (C) At
a particular speed the discharge at which efficiency of a pump is maximum, is
known as normal discharge
- (D) All the
above
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