Practice Test: Question Set - 06
1. Pick up the correct statement from the following:
- (A) Lime may be
used to soften the hard water
- (B) Excessive
use of lime may kill the bacterias
- (C) Excessive
lime when added to water, raises its pH value
- (D) All
the above
2. The gaseous form of chlorine gets converted into liquid form when subjected to a pressure of
- (A) 5 kg/cm2
- (B) 6 kg/cm2
- (C) 7 kg/cm2
- (D) 10 kg/cm2
3. Flow through period, in sedimentation tanks, is
- (A) Equal to
detention period
- (B) More than
detention period
- (C) Less
than detention period
- (D) Detention
period divided by displacement efficiency
4. Turbidity of water may be caused due to
- (A) Suspended
clay
- (B) Suspended
silt
- (C) Finely
divided organic material
- (D) All the
above
5. Pick up the incorrect statement from the following:
- (A) The
water entering the slow sand filters should be treated by 9.386 coagulants
- (B) The depth of
water on the filter should be twice the depth of the filter sand
- (C) When the
filter head is 0.75 times the depth of filter sand, the water obtained is
purest
- (D) All the
above
6. The maximum hourly consumption, is generally taken as
- (A) 110 %
- (B) 120 %
- (C) 140 %
- (D) 150 %
7. Hardness of water can be removed by boiling if it is due to
- (A) Calcium
bicarbonates
- (B) Calcium
sulphates
- (C) Calcium
chloride
- (D) Calcium
nitrates
8. S1 and S2 are the draw downs in an observation well at times t1 and t2 after pumping. For discharge Q and coefficient of transmissibility T, the relationship, is
- (A) S2 - S1 = (2.3Q/πT) log10 (t2/t1)
- (B) S2 - S1 = (2.3Q/4πT) log10 (t2/t1)
- (C) S2 - S1 = (2.3Q/4πT) loge (t2/t1)
- (D) S2 - S1 = (2.3Q/4πT) loge (t1/t2)
9. If discharge of a pump is 0.16 cumecs, the economic diameter of pipe, is
- (A) 0.488 m
- (B) 4.88 cm
- (C) 48.8 cm
- (D) 4.88 m
10. Hardness of water is caused by
- (A) Presence of
soap lather
- (B) Presence of
chlorides and sulphates of sodium and potassium
- (C) Presence of
bicarbonates, sulphates or chlorides of calcium and magnesium
- (D) Turbidity
11. Pick up the correct statement from the following:
- (A) The pH value
of neutral water is 7
- (B) The maximum
acidity is obtained when pH value is zero
- (C) The maximum
alkalinity is obtained when pH value is 14
- (D) All the
above
12. Pick up the correct statement from the following:
- (A) The amount
of rainfall in 24 hours, is known as daily rainfall
- (B) The
amount of rainfall in one year, is known as annual rainfall
- (C) The rain
cycle period in India is taken as 35 years
- (D) All
the above
13. Detention period of a settling tank is
- (A) Average
theoretical time required for water to flow through the tank
- (B) Time
required for flow of water to fill the tank fully
- (C) Average time
for which water is retained in tank
- (D) All the above
14. The average domestic consumption under normal conditions in an Indian city per day per person, is
- (A) 105 liters
- (B) 115 liters
- (C) 125 liters
- (D) 135 liters
15. If d is the diameter of the pipe, p is the total internal pressure, f is the permissible tensile stress and n is the effective of the joint, the thickness t of metal pipe, is
- (A) n (pd/2f)
- (B) (1/n) (pd/2f)
- (C) (1/n) (pd/3f)
- (D) (1/n) (pf/d)
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