5814 + Mcqs in Civil Engineering Page 90 McqOptions

4451.	Rapid gravity filters can remove bacterial impurities up to a maximum of
A.	50%
B.	60%
C.	70%
D.	80%
E.	90%.
Answer» E. 90%.

Discussion

4452.	Run off is the quantity of water which flows
A.	in sewer pipes
B.	due to leakage in pipes
C.	in rivers
D.	none of these.
Answer» D. none of these.

Discussion

4453.	The efficiency of a pumping set, is generally assumed
A.	50%
B.	55%
C.	60%
D.	65%
E.	70%.
Answer» E. 70%.

Discussion

4454.	To remove very fine suspended particles from water, the method adopted is
A.	screening
B.	sedimentation
C.	boiling
D.	filtration.
Answer» E.

Discussion

4455.	Efficiency of removing bacterias from raw water by a slow sand filter, is
A.	80% to 81%
B.	85% to 86%
C.	90% to 97%
D.	98% to 99%.
Answer» E.

Discussion

4456.	De-chlorination is followed by
A.	post-chlorination
B.	pre-chlorination
C.	double-chlorination
D.	super-chlorination.
Answer» E.

Discussion

4457.	For a city developed haphazardly, the layout of distribution pipes preferred to, is
A.	ring system
B.	radial system
C.	grid iron system
D.	dead end system.
Answer» E.

Discussion

4458.	In distribution pipes, air valves are provided at
A.	lower points
B.	junction points
C.	higher points
D.	any where.
Answer» D. any where.

Discussion

4459.	Surcharge storage zone of a reservoir, is
A.	below dead storage
B.	between dead storage and useful storage
C.	above useful storage
D.	also known as valley storage.
Answer» D. also known as valley storage.

Discussion

4460.	Surface water may
A.	contain large amount of impurities
B.	be contaminated by impurities
C.	contain disease producing bacterias
D.	all the above.
Answer» E.

Discussion

4461.	The dilution ratio at which the odour is hardly detectable is generally called threshold odour number and for public supplies it should not exceed
A.	3
B.	5
C.	7
D.	9
E.	10
Answer» B. 5

Discussion

4462.	Disappearance of pink colour of water of a well due of KMnO4 indicates that water contains
A.	acidity
B.	alkalinity
C.	turbidity
D.	organic matter
E.	all the above.
Answer» E. all the above.

Discussion

4463.	Shales are
A.	porous
B.	permeable
C.	porous and permeable
D.	porous but not permeable
E.	neither porous nor permeable.
Answer» E. neither porous nor permeable.

Discussion

4464.	Water is distributed to consumers by gravitational system, in
A.	Dehradun
B.	Bombay
C.	Delhi
D.	Calcutta
E.	Both (a) and (b).
Answer» F.

Discussion

4465.	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

4466.	For a network of distribution pipes of a proposed township shown in the below figure, the layout of distribution system, is
A.	dead end system
B.	grid-iron system
C.	ring system
D.	radial system.
Answer» E.

Discussion

4467.	Raw water treated with only chlorine, is known as
A.	plain chlorination
B.	pre-chlorination
C.	first-chlorination
D.	de-chlorination
E.	none of these.
Answer» B. pre-chlorination

Discussion

4468.	The level of underground water is called
A.	water level
B.	water table
C.	negative level
D.	invert level.
Answer» C. negative level

Discussion

4469.	Per capita demand of water is calculated in litres
A.	per person per day
B.	per person per month
C.	per person per year
D.	none of these.
Answer» B. per person per month

Discussion

4470.	P.V.C. pipes can withstand pressure bead of water upto
A.	25 m
B.	50 m
C.	75 m
D.	100 m
E.	125 m.
Answer» E. 125 m.

Discussion

4471.	The population of a city in 2000 is 50,000. The average increase in population over last 8 decades is 7500 and average incremental increase during 8 decades is 750. The population of the city based on incremental method, in the year 2020 will be
A.	55,000
B.	60,500
C.	66,500
D.	72,500
E.	76,500
Answer» D. 72,500

Discussion

4472.	The storage capacity of a reservoir may be divided into three zones. The lowest zone is
A.	Dead storage
B.	Useful storage
C.	Surcharge storage
D.	None of these.
Answer» B. Useful storage

Discussion

4473.	In a rapid gravity filter
A.	raw water from the source is supplied
B.	disinfected raw water is supplied
C.	raw water passed through coagulation tank is supplied
D.	none of these.
Answer» D. none of these.

Discussion

4474.	The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is
A.	1.095
B.	1.085
C.	1.075
D.	1.065
Answer» B. 1.085

Discussion

4475.	For trunk and out-fall, the type of sewers generally used, is
A.	standard egg shaped
B.	circular shaped
C.	horse shoe shaped
D.	parabolic shaped
E.	semi-elliptical shaped.
Answer» D. parabolic shaped

Discussion

4476.	Hydraulic mean radius is
A.	mean radius of sewer
B.	difference in heads between two points in circular pipes
C.	mean of radii in a pipe line of varying cross-sections
D.	cross-sectional area/wetted perimeter.
Answer» E.

Discussion

4477.	In septic tanks,
A.	free board of 0.3 m may be provided
B.	the baffles or tees are extended up to top level of scum
C.	the clear space between the baffle top and covering slab is about 7.5 cm
D.	the inlet is kept 30 cm below the sewage line and outlet is kept at a level 40% depth of the sewage
E.	all the above.
Answer» F.

Discussion

4478.	The sewer pipe which carries sewage from a building for immediate disposal is
A.	house sewer
B.	lateral sewer
C.	intercepting sewer
D.	main sewer.
Answer» B. lateral sewer

Discussion

4479.	The algae dies out in the zone of
A.	degradation
B.	active decomposition
C.	recovery
D.	cleaner water.
Answer» B. active decomposition

Discussion

4480.	The recommended detention period for grit chambers is
A.	1 minute
B.	2 minutes
C.	3 minutes
D.	5 minutes.
Answer» B. 2 minutes

Discussion

4481.	Water to the consumers may be supplied from
A.	infiltration galleries connected to sump well
B.	infiltration well dug out on the banks of rivers
C.	ranney wells sunk to the water level
D.	all the above.
Answer» E.

Discussion

4482.	The type of pipe commonly used in water supply distribution schemes, is
A.	R.C.C. pipes
B.	Hume pipes
C.	Cast iron pipes
D.	G.I. pipes.
Answer» D. G.I. pipes.

Discussion

4483.	The ratio of maximum hourly consumption and average hourly consumption of the maximum day, is
A.	1.2
B.	1.5
C.	1.8
D.	2.4
E.	2.7
Answer» F.

Discussion

4484.	The depth of the water table at a place is 45 m below the general ground level. To lift water from a deep tube well in such a locality, the type of pump to be installed is
A.	Centrifugal pump
B.	Reciprocating pump
C.	Deep well turbine pump
D.	None of these.
Answer» D. None of these.

Discussion

4485.	Critical time for developing a water hammer, is the time required for
A.	closing the valve
B.	the wave to travel from valve to the reservoir
C.	the wave to travel from the valve to the reservoir and back
D.	none of these.
Answer» D. none of these.

Discussion

4486.	High pH value of water does not produce
A.	incrustation
B.	sediment deposits
C.	turberculation
D.	corrosion
E.	both (c) and (d).
Answer» F.

Discussion

4487.	The fire demand for ascertaining the empirical formula known as
A.	Kuichling's formula
B.	Buston's formula
C.	Freeman formula
D.	Under Writers formula
E.	None of these.
Answer» D. Under Writers formula

Discussion

4488.	The permissible pH value for public water supplies may range between
A.	4.5 to 5.5
B.	5.5 to 6.5
C.	6.5 to 8.5
D.	8.5 to 10.5
E.	none of these.
Answer» D. 8.5 to 10.5

Discussion

4489.	The strainer type tube well, is unsuitable for
A.	coarse gravels
B.	fine sandy strata
C.	clean gravels
D.	none of these.
Answer» C. clean gravels

Discussion

4490.	Most commonly used section in grade aqueducts, is
A.	circular
B.	rectangular
C.	parabolic
D.	horse shoe section.
Answer» C. parabolic

Discussion

4491.	Pressure exerted at 90 bend in a pipe of cross-sectional area A and carrying water with a velocity V under a pressure p, is
A.	<img src="/_files/images/civil-engineering/water-supply-engineering/211-10.113-1.png">
B.	<img src="/_files/images/civil-engineering/water-supply-engineering/211-10.113-2.png">
C.	<img src="/_files/images/civil-engineering/water-supply-engineering/211-10.113-3.png">
D.	<img src="/_files/images/civil-engineering/water-supply-engineering/211-10.113-4.png">
Answer» D. <img src="/_files/images/civil-engineering/water-supply-engineering/211-10.113-4.png">

Discussion

4492.	Cast iron pipes are generally preferred to, because
A.	of moderate cost
B.	of ease to join
C.	of durability
D.	of longer life
E.	all the above.
Answer» F.

Discussion

4493.	Distribution of wash water is provided in
A.	sedimentation tank
B.	slow sand filter
C.	rapid gravity filter
D.	all the above.
Answer» D. all the above.

Discussion

4494.	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

4495.	To detect the turbidity of the order of 0 to 1000 P.P.M. the instrument used is
A.	turbidimeter
B.	Jackson turbidimeter
C.	Baylis turbidimeter
D.	Hallige turbidimeter.
Answer» D. Hallige turbidimeter.

Discussion

4496.	Standard process of chlorination of water, is done by
A.	plain chlorination
B.	pre-chlorination
C.	post-chlorination
D.	double chlorination.
Answer» D. double chlorination.

Discussion

4497.	If the chosen diameter of a pipe, is less than the economical diameter
A.	cost of pipe will be less
B.	head loss will be high
C.	cost of pumping will be more than saving
D.	all the above.
Answer» E.

Discussion

4498.	Water gets evaporated from water surfaces and land surfaces, get converted into water drops at lower temperatures, flows over ground surface and finally meets its source, i.e. lake, sea, etc. This entire process is generally known as
A.	hydrological cycle
B.	water cycle
C.	evaporation and precipitation cycle
D.	all the above.
Answer» E.

Discussion

4499.	The U.C. (uniformity coefficient) for the best filter media sand should be
A.	2
B.	3
C.	4
D.	5
E.	none of these.
Answer» B. 3

Discussion

4500.	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

Explore topic-wise MCQs in Engineering.

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

Run off is the quantity of water which flows

The efficiency of a pumping set, is generally assumed

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

Efficiency of removing bacterias from raw water by a slow sand filter, is

De-chlorination is followed by

For a city developed haphazardly, the layout of distribution pipes preferred to, is

In distribution pipes, air valves are provided at

Surcharge storage zone of a reservoir, is

Surface water may

The dilution ratio at which the odour is hardly detectable is generally called threshold odour number and for public supplies it should not exceed

Disappearance of pink colour of water of a well due of KMnO4 indicates that water contains

Shales are

Water is distributed to consumers by gravitational system, in

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

For a network of distribution pipes of a proposed township shown in the below figure, the layout of distribution system, is

Raw water treated with only chlorine, is known as

The level of underground water is called

Per capita demand of water is calculated in litres

P.V.C. pipes can withstand pressure bead of water upto

The population of a city in 2000 is 50,000. The average increase in population over last 8 decades is 7500 and average incremental increase during 8 decades is 750. The population of the city based on incremental method, in the year 2020 will be

The storage capacity of a reservoir may be divided into three zones. The lowest zone is

In a rapid gravity filter

The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is

For trunk and out-fall, the type of sewers generally used, is

Hydraulic mean radius is

In septic tanks,

The sewer pipe which carries sewage from a building for immediate disposal is

The algae dies out in the zone of

The recommended detention period for grit chambers is

Water to the consumers may be supplied from

The type of pipe commonly used in water supply distribution schemes, is

The ratio of maximum hourly consumption and average hourly consumption of the maximum day, is

The depth of the water table at a place is 45 m below the general ground level. To lift water from a deep tube well in such a locality, the type of pump to be installed is

Critical time for developing a water hammer, is the time required for

High pH value of water does not produce

The fire demand for ascertaining the empirical formula known as

The permissible pH value for public water supplies may range between

The strainer type tube well, is unsuitable for

Most commonly used section in grade aqueducts, is

Pressure exerted at 90 bend in a pipe of cross-sectional area A and carrying water with a velocity V under a pressure p, is

Cast iron pipes are generally preferred to, because

Distribution of wash water is provided in

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

To detect the turbidity of the order of 0 to 1000 P.P.M. the instrument used is

Standard process of chlorination of water, is done by

If the chosen diameter of a pipe, is less than the economical diameter

Water gets evaporated from water surfaces and land surfaces, get converted into water drops at lower temperatures, flows over ground surface and finally meets its source, i.e. lake, sea, etc. This entire process is generally known as

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

Specific yield of a well is