civil engineering MCQs – Page 102

Practise multiple-choice questions from civil engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

civil engineering Mcqs
5051. Which one of the following part of human body withstands minimum radiation ?
comments icon0

A. Kidneys

B. Thyroid

C. Ovaries/testis

D. Eyes

5052. The asbestos cement pipes are generally laid___________________?
comments icon0

A. At an angle of 30

B. At an angle of 60

C. Vertically

D. Horizontally

5053. A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is_____________________?
comments icon0

A. 0.30 m/sec

B. 0.40 m/sec

C. 0.35 m/sec

D. 0.45 m/sec
5054. The first stage of neutral process of sludge digestion, is__________________?
comments icon0
A. Acid fermentation

B. None of these

C. Acid regressio

D. Alkaline fermentation

5055. In sewage having fully oxidised organic matter, the nitrogen exists in the form of________________?
comments icon0

A. Aluminoid nitrogen

B. Nitrates

C. Free ammonia

D. Nitrites

5056. The rate of accumulation of sludge per person per year, is_______________________?
comments icon0

A. 15 litres

B. 20 litres

C. 10 litres

D. 25 litres

5057. weight of water, the hydraulic mean depth of the sewer and the bed slope w is the unit of the sewer, then the tractive force exerted by flowing water, is________________________?
comments icon0
A. w r S S

B. w r1/2

C. w r S

D. w r2/3

5058. The digested sludge from septic tanks, is removed after a maximum period of__________________?
comments icon0
A. 3 years

B. 4 years

C. 5 years

D. 3.5 years

5059. For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is____________________?
comments icon0

A. Cast iron sewers

B. Glazed bricks sewers

C. Stone ware sewers

D. Cement concrete sewers

5060. The design period in years for pumping plants, is___________________?
comments icon0
A. 5 to 10

B. 3 to 5

C. 2 to 3

D. 1

5061. Boussinesqs equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is__________________?
comments icon0

A. pt = 2 3p/3Z5

B. pt = 3H3p/2Z5

C. pt = 3H3p/2 Z5

D. pt = 2H3p/3 Z5

5062. If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is___________________?
comments icon0

A. 2 hours

B. 4 hours

C. 6 hours

D. 8 hours
5063. The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120, the depth of sewerage is________________________?
comments icon0

A. 25 cm

B. 40 cm

C. 20 cm

D. 50 cm
5064. As compared to fresh river water, sea water contains oxygen_________________?
comments icon0

A. 10% less

B. 20% more

C. 20% less

D. 10% more

5065. You are asked to design sewer pipes of diameters 0.4 m to 0.9 m at maximum flow, you will assume the sewer flow running at___________________?
comments icon0

A. Three fourth full

B. Full depth

C. Half full

D. Two third full

5066. Kjeldahl nitrogen is a mixture of___________________?
comments icon0
A. All the above

B. Ammonia and nitrogen

C. Nitrogen and organic nitrogen

D. Organic nitrogen and ammonia

5067. Assertion A. : Discharging the effluents from the oxidation ponds just up stream of lakes or reservoirs is undesirable. Reason (R) : The discharged algae get settled in the reservoirs and cause anaerobic decomposition and other water qualities_________________?
comments icon0
A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is not a correct explanation of A

C. A is true but R is false

D. A is false but R is true

5068. are available in size Stoneware sewers________________?
comments icon0
A. All the above

B. 10 cm

C. 20 cm

D. 15 cm

5069. The sewage treatment in septic tanks is due to__________________?
comments icon0

A. Aerobic decomposition

B. None of these

C. Parasitic decomposition

D. Anaerobic decomposition
5070. The water carried sewerage system removes__________________?
comments icon0

A. Domestic sewage

B. Storm sewage

C. Industrial sewage

D. All the above
5071. Sludge banks are formed if sewage is disposed of in____________________ ?
comments icon0
A. Seas

B. Lakes

C. Rivers

D. None of these

5072. The intensity of rain is expressed in________________?
comments icon0

A. cm/minute

B. None of these

C. cm/hour

D. cm/day

5073. The drop man holes are generally provided in sewers for____________________?
comments icon0
A. Hilly town ships

B. Industrial areas

C. Large town ships

D. Cities in plains

5074. If is the rugosity coefficient, is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula V = (1/n) r2/3 s1/2 evolved by_________________?
comments icon0

A. Bazin

B. Kutter

C. Manning

D. Chezy

5075. For providing an Indian type W.C., the R.C.C. slabs in the toilet portion__________________?
comments icon0
A. Should be sunk by 50 cm

B. Should be sunk by 20 cm

C. Should be kept 20 cm above the adjacent portion

D. Need not be sunk

5076. The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope_________________?
comments icon0

A. 1 in 15

B. 1 in 20

C. 1 in 5

D. 1 in 10
5077. Assertion A.: A free board of 0.3 m is provided above the top sewage line in septic tanks. Reason (R): It helps to accommodate the scum in the septic tank_________________?
comments icon0
A. Both A and R is true and R is the correct explanation of A

B. Both A and R is true but R is not a correct explanation of A

C. A is true but R is false

D. A is false but R is true

5078. The quantity of liquid waste which flows in sewers during the period of rainfall, is known__________________?
comments icon0

A. Sanitary sewage

B. None of these

C. Industrial waste

D. Storm sewage
5079. When drainage to sewage ratio is 20, the peak dry weather flow is_______________?
comments icon0

A. 20% of the design discharge

B. Slightly less than 5% of the design discharge

C. None of these

D. Slightly more than 5% of the design discharge

5080. If is the diameter of upper circular portion, the area of cross-section of a standard egg shaped sewer, is____________________?
comments icon0

A. D

B. D

C. D

D. D
5081. If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains__________________?
comments icon0

A. Methane

B. Carbon dioxide

C. Hydrogen sulphide

D. Oxygen

5082. In SI units the power of sound is represented in __________________?
comments icon0
A. Watts

B. Newtons

C. Kgs

D. Joules

5083. Water content of sewage is about___________________?
comments icon0

A. 90%

B. 99%

C. 95%

D. 9.9 %
5084. Drop manholes are the manholes___________________?
comments icon0

A. With depths more than 3.5 m

B. Without entry ladders

C. Having drains at different levels

D. Without manhole covers

5085. Pick up the incorrect size of stone ware sewers_________________?
comments icon0

A. 82.5 cm

B. None of these

C. 52.5 cm

D. 67.5 cm

5086. Primary treatment of sewage consists of removal of__________________?
comments icon0
A. Large suspended organic solids

B. Sand and girt

C. Floating materials

D. Oil and grease

5087. The minimum recommended diameter of sewers, is_________________?
comments icon0

A. 10 cm

B. 15 cm

C. 5 cm

D. 20 cm

5088. The effluent of a septic tank is_________________?
comments icon0

A. None of these

B. Foul and contains dissolved and suspended solids

C. Fit for discharge into any open drain

D. As good as that from a complete treatment

5089. For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is________________?
comments icon0
A. 15 cm

B. 18 cm

C. 12 cm

D. 10 cm

5090. The settlement of a particle in sedimentation tank, is affected by_____________________?
comments icon0
A. All the above

B. Velocity of flow

C. Size and shape of solid

D. Viscosity of water

5091. In areas where light rains are uniformly distributed throughout the year, the type of sewerage system to be adopted is_______________?
comments icon0

A. None of these

B. Combined system

C. Separate system

D. Partially combined system

5092. In case of sewer lines_________________?
comments icon0

A. Obstruction test is carried out with the help of smooth ball of diameter 13 mm

B. Water test is carried out to check water tightness of the joints

C. Test for straightness is carried out with the help of a lamp and mirror

D. All the above
5093. If the discharge of a sewer running half is 628 1.p.s., i = 0.001, and n = 0.010, the diameter of the sewer, is__________________?
comments icon0
A. 1.69 m

B. 1.39 m

C. 1.59 m

D. 1.49 m

5094. Fresh sewage is generally_____________________?
comments icon0

A. Acidic

B. Alkaline

C. A source of objectionable odour

D. Highly decomposed

5095. The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is____________________?
comments icon0

A. 4

B. 3

C. 1.5

D. 2

5096. For estimating the peak run off the rational formula Q = 0.0278 KpA was evolved by______________?
comments icon0

A. Frubling

B. Kinchling

C. All the above

D. Lloyd Davis

5097. In septic tanks, decomposition of organic bacteria, is done by_____________________?
comments icon0
A. Anaerobic bacteria

B. Aerobic bacteria

C. Both types of bacterias

D. None of these

5098. If the depth of partial flow in a sewer of diameter 2 m, is 50 cm, its wetted perimeter is____________________ ?
comments icon0

A. 3-Jan

B. 0/2

C. 2 /3

D. 0/3

5099. Stone ware pipes are_______________?
comments icon0

A. Highly resistant to sulphide corrosion

B. Especially suited to pressure pipes

C. Highly impervious

D. Hydraulically efficient because of their smooth interior surface

5100. A drop manhole is provided if__________________?
comments icon0

A. None of these

B. A sewer drops from a height

C. A lamp is inserted to check obstruction

D. A branch sewer joins the main sewer at higher level