In a reservoir the average volume of sediment deposition is 0.15 million cubic per year. If the dead storage and total capacity of the reservoir are 8 million cubic metres and 36 million cubic metres respectively,

the reservoir will theoretically be silted in 240 years

the reservoir will start reducing after 60 years

Sluice valves are fitted in a distribution system

along straight length of pipes at suitable intervals

at the branching off points of sub-mains

The main disadvantage of hard water, is

corrosion and incrustation of pipes

Sluice valves in main water supplies

are used to regulate the flow of water in pipes

are usually placed at the summits

Check valves are installed

on the delivery side of the pumping set

at the interconnections between polluted water system and a potable water system

While selecting the location of an intake for collecting surface water, the factor considered, is

The intake point should be near as far as possible to the treatment plant

The intake point should be in purer zone of the water source

The intake point should be upstream of the point of disposal of waste water

Disinfection of water with ozone is not good because

it vanishes before water reaches the consumers

it removes the colour, taste and odour from water as bacterias

it is more efficient than chlorine in killing bacterias

Flow through period, in sedimentation tanks, is

detention period divided by displacement efficiency

Turbidity of water may be caused due to

finely divided organic material

A city supply includes

industrial and commercial water demands

demand for public uses and fire

A circular gravity aqueduct is not generally preferred to because of

its maximum hydraulic mean depth

maximum area per unit of wetted perimeter

its proper support on the ground.

Specific yield of a well is

quantity of water per unit time per unit draw-down.

quantity of water than can be drawn from the well

total quantity of water available in the well

quantity of water per unit time per unit draw-down.

Water supply includes

collection, transportation and treatment of water

distribution of water to consumers

provision of hydrants for fire fighting

Alkalinity in water may be caused due to

calcium and magnesium bicarbonates

Rapid gravity filters

make use of coarser sand with effective size as 0.5 mm

yield as high as 30 times the yield of slow sand filters

412 + Mcqs in Water Supply Engineering in Surveying Page 4 McqOptions

151.	In a reservoir the average volume of sediment deposition is 0.15 million cubic per year. If the dead storage and total capacity of the reservoir are 8 million cubic metres and 36 million cubic metres respectively,
A.	the reservoir will theoretically be silted in 240 years
B.	the reservoir will start reducing after 60 years
C.	both (a) and (b)
D.	neither (a) nor (b).
Answer» D. neither (a) nor (b).

Discussion

152.	A strainer type well sunk through three pervious layers intervened by three impervious aquicludes, draws water from
A.	top most pervious layer
B.	central pervious layer
C.	lowest pervious layer
D.	all the pervious layers.
Answer» E.

Discussion

153.	The U.C. (uniformity coefficient) D₆₀/D₁₀ for the best filter media sand should be
A.	2
B.	3
C.	4
D.	5
Answer» B. 3

Discussion

154.	135 litres of water per person per day, is provided in
A.	nurses homes
B.	hostels
C.	residential schools
D.	all the above.
Answer» E.

Discussion

155.	The ensure proper growth of children's teeth, the quantity of flouride used in water mains, is
A.	1 mg/litre
B.	2 mg/litre
C.	3 mg/litre
D.	4 mg/litre
Answer» B. 2 mg/litre

Discussion

156.	Water losses in water supply, is assumed as
A.	5%
B.	7.5%
C.	10%
D.	15%.
Answer» E.

Discussion

157.	Shales are
A.	porous
B.	permeable
C.	porous and permeable
D.	porous but not permeable
Answer» E.

Discussion

158.	Pick up the incorrect statement from the following. The source of surface water is from
A.	streams and rivers
B.	storage reservoirs
C.	springs
D.	ponds and lakes
Answer» D. ponds and lakes

Discussion

159.	Standard unit of turbidity of water is in one litre of distilled water, one milligram of finely divided
A.	silica
B.	mud
C.	clay
D.	organic matter.
Answer» B. mud

Discussion

160.	Sluice valves are fitted in a distribution system
A.	along straight length of pipes at suitable intervals
B.	at the junctions of the pipes
C.	at the branching off points of sub-mains
D.	all the above.
Answer» E.

Discussion

161.	The main disadvantage of hard water, is
A.	greater soap consumption
B.	scaling of boilers
C.	corrosion and incrustation of pipes
D.	all the above.
Answer» E.

Discussion

162.	The coefficient of permeability of soils, is generally expressed in
A.	cm/sec
B.	cm/minute
C.	cm²/sec
D.	cm²/minute.
Answer» B. cm/minute

Discussion

163.	The total domestic consumption in a city water supply, is assumed
A.	20%
B.	30%
C.	40%
D.	60%.
Answer» E.

Discussion

164.	Sluice valves in main water supplies
A.	are used to regulate the flow of water in pipes
B.	are spaced about 5 km apart
C.	are usually placed at the summits
D.	all the above.
Answer» E.

Discussion

165.	Check valves are installed
A.	on the delivery side of the pumping set
B.	at the interconnections between polluted water system and a potable water system
C.	both (a) and (b)
D.	neither (a) nor (b).
Answer» D. neither (a) nor (b).

Discussion

166.	Percussion drilling is unsuitable in
A.	unconsolidated sand
B.	unconsolidated gravel
C.	quick sand
D.	consolidated rocks.
Answer» E.

Discussion

167.	Dissolved carbon dioxide, can be removed from the supply main by
A.	sedimentation
B.	aeration
C.	chlorination
D.	coagulation
Answer» C. chlorination

Discussion

168.	While selecting the location of an intake for collecting surface water, the factor considered, is
A.	The intake point should be near as far as possible to the treatment plant
B.	The intake point should be in purer zone of the water source
C.	The intake point should be upstream of the point of disposal of waste water
D.	All the above
Answer» E.

Discussion

169.	The best quality of filter material is obtained from quartzite if it does not loose weight when placed in hydro-chloric acid for 24 hours, more than
A.	5%
B.	8%
C.	10%
D.	12%
Answer» B. 8%

Discussion

170.	Disinfection of water with ozone is not good because
A.	it vanishes before water reaches the consumers
B.	it removes the colour, taste and odour from water as bacterias
C.	it adds taste to the water
D.	it is more efficient than chlorine in killing bacterias
Answer» E.

Discussion

171.	Detention time for plain sedimentation tank usually ranges from
A.	2 to 4 hours
B.	4 to 8 hours
C.	6 to 10 hours
D.	8 to 12 hours
Answer» C. 6 to 10 hours

Discussion

172.	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
Answer» D. detention period divided by displacement efficiency

Discussion

173.	The valves provided at low points of pipes to drain off water quickly under gravity, are called
A.	blow off valves
B.	drain valves
C.	sewer valves
D.	all the above.
Answer» E.

Discussion

174.	In an artesian acquifer, the draw downs in two observation wells at distances 100 m, and 200 m were found same after one hour and x hours respectively. The value of x, is
A.	2 hours
B.	4 hours
C.	9 hours
D.	16 hours.
Answer» C. 9 hours

Discussion

175.	The most ideal disinfectant used for drinking water throughout the world, is
A.	alum
B.	lime
C.	chlorine
D.	nitrogen
Answer» D. nitrogen

Discussion

176.	Normal values of overflow rate for sedimentation tanks using coagulants in litres/hr/m² , generally range between
A.	250 to 500
B.	500 to 750
C.	750 to 1000
D.	1000 to 1250
Answer» E.

Discussion

177.	Turbidity of water may be caused due to
A.	Suspended clay
B.	Suspended silt
C.	finely divided organic material
D.	all the above.
Answer» E.

Discussion

178.	To control the growth of algae in reservoirs, the compound which is used, is
A.	bleaching powder
B.	copper sulphate
C.	lime solution
D.	alum solution
Answer» C. lime solution

Discussion

179.	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.
Answer» E.

Discussion

180.	The force which develops in a pressure conduit supported on trestles, is
A.	tension
B.	compression
C.	temperature stress
D.	flexural stress.
Answer» E.

Discussion

181.	A water channel supported above the ground over trestles, is generally called
A.	flume
B.	canal
C.	adueduct
D.	tunnel
Answer» B. canal

Discussion

182.	Manholes are less common in
A.	cast iron pipes
B.	steel pipes
C.	hume steel pipes
D.	R.C.C. pipes.
Answer» B. steel pipes

Discussion

183.	Rapid gravity filters can remove bacterial impurities up to a maximum of
A.	50%
B.	60%
C.	70%
D.	80%
Answer» E.

Discussion

184.	Aqueducts are generally designed
A.	circular
B.	rectangular
C.	horse shoe section
D.	all the above.
Answer» E.

Discussion

185.	Filtration of water is done to remove
A.	colour
B.	odour
C.	turbidity
D.	pathogenic bacteria
Answer» D. pathogenic bacteria

Discussion

186.	The bacterias which may survive with or without free oxygen, are called
A.	Aerobic bacterias
B.	Anaerobic bacterias
C.	Faculative bacteria's
D.	None of these.
Answer» D. None of these.

Discussion

187.	To remove very fine suspended particles from water, the method adopted is
A.	screening
B.	sedimentation
C.	boiling
D.	filtration.
Answer» E.

Discussion

188.	A circular gravity aqueduct is not generally preferred to because of
A.	its maximum hydraulic mean depth
B.	maximum area per unit of wetted perimeter
C.	minimum cost of construction
D.	its proper support on the ground.
Answer» E.

Discussion

189.	Normal values of overflow rate for plain sedimentation tank using coagulants, is
A.	750 to 1000 litres/hr/m²
B.	1000 to 1250 litres/hr/m²
C.	1250 to 1500 litres/hr/m²
D.	1500 litres/hr/m².
Answer» C. 1250 to 1500 litres/hr/m²

Discussion

190.	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.
Answer» D. quantity of water per unit time per unit draw-down.

Discussion

191.	Alum is chemically
A.	Copper sulphate
B.	Aluminium sulphate
C.	Ferrous sulphate
D.	Ferric sulphate.
Answer» C. Ferrous sulphate

Discussion

192.	Water supply includes
A.	collection, transportation and treatment of water
B.	distribution of water to consumers
C.	provision of hydrants for fire fighting
D.	all the above.
Answer» E.

Discussion

193.	The maximum permissible chloride content in treated water of public water supplies should not exceed
A.	50 P.P.M.
B.	100 P.P.M.
C.	150 P.P.M.
D.	250 P.P.M.
Answer» E.

Discussion

194.	In distribution pipes, drain valves are provided at
A.	lower point
B.	higher point
C.	junction points
D.	any where.
Answer» B. higher point

Discussion

195.	Alkalinity in water may be caused due to
A.	calcium and magnesium bicarbonates
B.	sodium carbonate
C.	potassium carbonate
D.	all the above.
Answer» E.

Discussion

196.	'Shrouding' is essentially provided in
A.	strainer type wells
B.	cavity type wells
C.	slotted type well
D.	all the above.
Answer» D. all the above.

Discussion

197.	Rapid gravity filter can only remove turbidity of water upto
A.	15 to 25 gm/litre
B.	25 to 30 gm/litre
C.	30 to 35 cm/litre
D.	35 to 40 gm/litre
Answer» E.

Discussion

198.	Gravity conduits for carrying water from the source are
A.	canals
B.	flumes
C.	acqueducts
D.	all the above.
Answer» E.

Discussion

199.	Rapid gravity filters
A.	were developed by G.W. Fullar
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.
Answer» E.

Discussion

200.	If w is the weight of water per cubic metre, Q is the discharge in cubic metres per sec and H is the total head, the required water horse power of the pump, is
A.	wQH/15
B.	wQH/360
C.	wQH/220
D.	wQH/550
Answer» B. wQH/360

Discussion

Explore topic-wise MCQs in Surveying.

In a reservoir the average volume of sediment deposition is 0.15 million cubic per year. If the dead storage and total capacity of the reservoir are 8 million cubic metres and 36 million cubic metres respectively,

A strainer type well sunk through three pervious layers intervened by three impervious aquicludes, draws water from

The U.C. (uniformity coefficient) D₆₀/D₁₀ for the best filter media sand should be

135 litres of water per person per day, is provided in

The ensure proper growth of children's teeth, the quantity of flouride used in water mains, is

Water losses in water supply, is assumed as

Shales are

Pick up the incorrect statement from the following. The source of surface water is from

Standard unit of turbidity of water is in one litre of distilled water, one milligram of finely divided

Sluice valves are fitted in a distribution system

The main disadvantage of hard water, is

The coefficient of permeability of soils, is generally expressed in

The total domestic consumption in a city water supply, is assumed

Sluice valves in main water supplies

Check valves are installed

Percussion drilling is unsuitable in

Dissolved carbon dioxide, can be removed from the supply main by

While selecting the location of an intake for collecting surface water, the factor considered, is

The best quality of filter material is obtained from quartzite if it does not loose weight when placed in hydro-chloric acid for 24 hours, more than

Disinfection of water with ozone is not good because

Detention time for plain sedimentation tank usually ranges from

Flow through period, in sedimentation tanks, is

The valves provided at low points of pipes to drain off water quickly under gravity, are called

In an artesian acquifer, the draw downs in two observation wells at distances 100 m, and 200 m were found same after one hour and x hours respectively. The value of x, is

The most ideal disinfectant used for drinking water throughout the world, is

Normal values of overflow rate for sedimentation tanks using coagulants in litres/hr/m² , generally range between

Turbidity of water may be caused due to

To control the growth of algae in reservoirs, the compound which is used, is

A city supply includes

The force which develops in a pressure conduit supported on trestles, is

A water channel supported above the ground over trestles, is generally called

Manholes are less common in

Rapid gravity filters can remove bacterial impurities up to a maximum of

Aqueducts are generally designed

Filtration of water is done to remove

The bacterias which may survive with or without free oxygen, are called

To remove very fine suspended particles from water, the method adopted is

A circular gravity aqueduct is not generally preferred to because of

Normal values of overflow rate for plain sedimentation tank using coagulants, is

Specific yield of a well is

Alum is chemically

Water supply includes

The maximum permissible chloride content in treated water of public water supplies should not exceed

In distribution pipes, drain valves are provided at

Alkalinity in water may be caused due to

'Shrouding' is essentially provided in

Rapid gravity filter can only remove turbidity of water upto

Gravity conduits for carrying water from the source are

Rapid gravity filters

If w is the weight of water per cubic metre, Q is the discharge in cubic metres per sec and H is the total head, the required water horse power of the pump, is