civil engineering Mcqs
1201. The total kinetic energy of a hoop of mass 2 kg and radius 4 m sliding with linear velocity 8 m/sec and angular velocity 5 radian/sec is_________________?
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A. 89 J

B. 464 J

C. 400 J

D. 64 J

1202. A cube on a smooth horizontal surface___________________?
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A. cannot be in neutral equilibrium

B. cannot be in stable equilibrium

C. can be in any of these states

D. cannot be in unstable equilibrium

1203. The length of rectangular sedimentation tank should not be more than_______________?
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A. 2B

B. 4B

C. B

D. 8B

1204. The effective size of sand particles used in slow sand filters is_______________?
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A. 0.35 to 0.60 mm

B. 0.60 to 1.00 mm

C. 1.00 to 1.80 mm

D. 0.25 to 0.35 mm
1205. The settling velocity of a particle in a sedimentation tank increases if______________?
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A. the surface area of tank is increased

B. the depth of tank is decreased

C. none of the above

D. particle size is decreased

1206. The treatment of water with bleaching powder is known as________________?
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A. hypochlorination

B. super chlorination

C. dechlorination

D. prechlorination

1207. A block in the shape of a parallelopiped of sides lm x 2m x 3m lies on the surface. Which of the faces gives maximum stable block ?
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A. equally stable on all faces

B. 1 m x 2 m

C. 1 m x 3m

D. 2 m x 3 m
1208. The settling velocity of a particle in a sedimentation tank depends on__________________?
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A. depth of tank

B. surface area of tank

C. both depth and surface area of tank

D. none of the above

1209. When two forces, each equal to P, act at 90 to each other, then the resultant will be_____________?
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A. P

B. P/V2

C. 2P

D. PV2
1210. The rate of filtration in slow sand filters in million litres per day per hectare is about_____________?
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A. 500 to 600

B. 100 to 150

C. 1400 to 1500

D. 50 to 60
1211. The maximum permissible limit for flouride in drinking water is______________?
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A. 5 mg/litre

B. 10 mg/litre

C. 1.5 mg/litre

D. 0.1 mg/litre

1212. The pitot tube is used to measure________________?
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A. velocity at stagnation point

B. stagnation pressure

C. dynamic pressure

D. static pressure

1213. Intrinisic equation of catenary is given by____________________?
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A. S = C cot <p

B. S = C sin cp

C. S = C tan q>

D. S = C cos cp

1214. Most of the bacteria in sewage are______________?
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A. pathogenic

B. saprophytic

C. anaerobic

D. parasitic

1215. A closed tank containing water is moving in a horizontal direction along a straight line at a constant speed. The tank also contains a steel ball and a bubble of air. If the tank is decelerated horizontally, then________________?
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A. the ball will move to the front

B. the bubble will move to the rear </strong>

C. d out which of the above statements are correct ?

D. the ball will move to the rear

E. the bubble will move to the front

1216. The most commonly used sewer under culverts is_______________?
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A. horse-shoe type sewer

B. circular cast iron sewer

C. circular brick sewer

D. semi-elliptical sewer

1217. Least possible value of correction factor for________________?
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A. kinetic energy is zero

B. momentum is zero

C. kinetic energy is 1

D. momentum is 1</strong>

1218. If a projectile is fired with an initial velocity of 10 m/sec at an angle of 60 to the horizontal, its horizontal and vertical velocity at the highest point of trajectory are___________________?
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A. 5 V3 m/sec and 0

B. 0 and 5 m/sec

C. 5 and 5V3 m/sec

D. 5 m/sec and 0
1219. If the average daily consumption of a city is 100,000 m3, the maximum daily consumption on peak hourly demand will be_______________?
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A. 180000m3

B. 100000m3

C. 270000 m3

D. 150000m3

1220. Double filtration is used_______________?
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A. to increase the filtration rapid sand filters capacity of

B. all of the above

C. for isolated buildings like pools, hotels etc swimming

D. to increase the filtration slow sand filters capacity of
1221. The pole distance is measured in___________________?
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A. mass scale

B. time scale

C. distance scale

D. force scale
1222. Activated carbon is used for_____________?
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A. removing corrosiveness

B. removing hardness

C. disinfection

D. removing odours
1223. When the velocity distribution is uniform over the cross-section, the correction factor for momentum is__________________?
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A. 3-Apr

B. 1

C. 0

D. 2

1224. An ideal fluid is_______________?
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A. very viscous

B. frictionless and compressible

C. frictionless and incompressible

D. one which obeys Newtons law of viscosity

1225. Which of the following unit works in anaerobic conditions ?
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A. trickling filters

B. activated sludge treatment

C. sludge digestion tank

D. sedimentation tank

1226. Two balls of masses 3 kg and 6 kg are moving with velocities of 4 m/sec and 1 m/sec respectively, towards each other along the line of their centers. After impact the 3 kg ball comes to rest. This can happen only if the coefficient of restitution between the balls is____________________?
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A. 3-Jan

B. 5-Mar

C. 1/5

D. 3-Feb

1227. For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as___________________?
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A. 4.5 to 6.0

B. 8.5 to 10.0

C. 6.5 to 8.0

D. 10.5 to 12.0

1228. A circular disc rotates at n rpm. The angular velocity of a circular ring of same mass and radius as the disc and to have the same angular momentum is___________________?
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A. n rpm

B. 2n rpm

C. n/4 rpm

D. n/2 rpm
1229. Which of the following retards the self purification of stream ?
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A. satisfying oxygen demand

B. higher temperature

C. none of the above

D. sunlight

1230. Disinfection efficiency is________________?
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A. highest at pH value equal to 7

B. reduced at higher pH value of water

C. unaffected by pH value of water

D. increased at higher pH value of water

1231. The overflow rate for plain sedimentation tanks is about__________________?
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A. 500 to 750 litres/hour/ m2

B. 1500 to 2000 litres/hour/m2

C. 1250 to 1500 litres/hour/m2

D. 1000 to 1250 litres/hour/ m2

1232. Minimum potential energy of a system will be in the position of________________?
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A. all of the above

B. neutral equilibrium

C. stable equilibrium

D. unstable equilibrium

1233. Orthotolidine test is used for determination of________________?
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A. biochemical oxygen demand

B. dissolved oxygen

C. residual chlorine

D. dose of coagulant

1234. A heavy ladder resting on floor and against a vertical wall may not be in equilibrium if________________?
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A. floor is smooth and wall is rough

B. floor is rough and wall is rough

C. both floor and wall are rough

D. both floor and wall are smooth

1235. Two pipe systems are said to be equivalent when_________________?
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A. friction factor and length are same in two systems

B. length of pipe and discharge are same in two systems

C. head loss and discharge are same in two systems

D. length and diameter are same in two systems

1236. When there is no recirculation of sewage, then recirculation factor is_______________?
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A. 0

B. 1

C. none of the above

D. infinity

1237. The maximum pull in a cable, carrying a uniformly distributed load and supported at two ends which are at the same level, is at_____________________?
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A. mid span

B. supports

C. quarter span

D. none of the above

1238. Assertion A : The consumption of water increases with increase in the distribution pressure. Reason R : Higher distribution pressure causes more loss and waste of water. Select your answer according to the coding system given below?
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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 the correct explanation of A

C. A is true but R is false

D. A is false but R is true

1239. An egg shaped section of sewer________________?
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A. is easy to construct

B. is economical than circular section

C. is more stable than circular section

D. provides self cleansing velocity at low discharges
1240. Cartesian form of the equation of catenary is_________________?
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A. y = c tan x/c

B. y = c sinh x/c

C. y = c cosh x/c

D. y = c sin1 x/c

1241. Generally the detention period for grit chambers is kept as_______________?
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A. 12 hours

B. 2-4 hours

C. 1 minute

D. 5 minutes

1242. Which of the following chemical compounds can be used for dechlorination of water ?
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A. sulphur dioxide

B. bleaching powder

C. chloramines

D. carbon dioxide

1243. Period of cleaning of slow sand filters is about________________?
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A. 2-3 months

B. 1-2 year

C. 24 48 hours

D. 10-12 days

1244. Hardy cross method of analysis of distribution system________________?
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A. involves successive trials

B. correct answer is?

C. is time consuming</strong>

D. takes economic aspects into account

1245. The depth d below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be_________________?
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A. 0.707 D

B. 0.423 D

C. 0.577 D

D. 0.223 D

1246. Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)________________?
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A. R > (N + y)

B. y = N + R

C. N = y + R

D. R = N + y

1247. A simple pendulum of length / has an energy E, when its amplitude is A. If the length of pendulum is doubled, the energy will be___________________?
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A. E

B. 2E

C. 4E

D. E/2
1248. If x is the distance from leading edge, then the boundary layer thickness in laminar flow varies as________________?
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A. x/7

B. x

C. x

D. x

1249. Sewerage system is designed for_______________?
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A. maximum flow only

B. maximum and minimum flow

C. minimum flow only

D. average flow only

1250. The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally_______________?
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A. less and less

B. less and more

C. more and more

D. more and less