civil engineering Mcqs
1151. The eccentricity (e) of a hollow circular column, external diameter 25 cm, internal diameter 15 cm for an eccentric load 100 t for non-development of tension, is__________________?
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A. 2.75 cm

B. 3.50 cm

C. 3.00 cm

D. 4.25 cm
1152. The magnitude of two forces, which when acting at right angle produce resultant force of VlOkg and when acting at 60 produce resultant of Vl3 kg. These forces are____________________?
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A. 2 and V6

B. none of the above

C. 2 and 5

D. 3 and 1 kg

E. V5andV5
1153. A close coil helical spring when subjected to a moment M having its axis along the axis of the helix_________________?
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A. Its mean diameter will decrease

B. It is subjected to pure bending

C. All the above

D. Its number of coils will increase

1154. Flat spiral springs_______________?
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A. Are supported at outer end

B. Are wound by applying a torque

C. All the above

D. Consist of uniform thin strips

1155. The ratio of the length and diameter of a simply supported uniform circular beam which experiences maximum bending stress equal to tensile stress due to same load at its mid span, is___________________?
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A. 4-Jan

B. 3-Jan

C. 8-Jan

D. 1/2
1156. cross sections of bronze and copper bars of equal lengt b c are their Ab and Ac are the respective stresses due to load P. If Pb and Pc are the loads shared by them, (where Eb and Ec are their modulii)____________________?
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A. P = Pb + Pc

B. P = Ab b + Ac b

C. All the above

D. b c = Eb /Ec

1157. The shape factor of standard rolled beam section varies from_______________?
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A. 1.20 to 1.30

B. 1.30 to 1.40

C. 1.10 to 1.20

D. 1.40 to 1.50

1158. A single force and a couple acting in the same plane upon a rigid body________________?
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A. none of the above

B. produce moment of a couple

C. are equivalent

D. balance each other

E. cannot balance each other
1159. Two coplanar couples having equal and op-posite moments_________________?
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A. produce a couple and an unbalanced force

B. are equivalent

C. can not balance each other

D. produce a moment of couple

E. balance each other

1160. A particle moves along a straight line such that distance (x) traversed in t seconds is given by x = t2 (t 4), the acceleration of the particle will be given by the equation_________________?
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A. 6f-4

B. 6t2-8t

C. 3t2-lt

D. 6f-8

E. 3t2+2t

1161. A composite beam is composed of two equal strips one of brass and other of steel. If the temperature is raised___________________?
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A. All the above

B. Brass experiences compressive force

C. Composite beam gets subjected to a couple

D. Steel experiences tensile force

1162. If a rigid body is in equilibrium under the action of three forces, then_______________?
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A. none of the above

B. these forces are equal

C. the lines of action of these forces are parallel

D. the lines of action of these forces meet in a point

E. B. and C. above
1163. Stanton diagram is a______________?
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A. log-log plot of relative roughness against Reynolds number

B. log-log plot of friction factor against Reynolds number

C. semi-log plot of friction factor against relative roughness

D. semi-log plot of friction factor against Reynolds number

1164. Two non-collinear parallel equal forces acting in opposite direction________________?
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A. constitute a resultant couple

B. constitute a moment

C. constitute a couple

D. constitute a moment of couple

E. balance each other

1165. A cantilever of length 2 cm and depth 10 cm tapers in plan from a width 24 cm to zero at its free end. If the modulus of elasticity of the material is 0.2 106 N/mm2, the deflection of the free end, is________________?
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A. 5 mm

B. 4 mm

C. 2 mm

D. 3 mm

1166. The general expression for the B.M. of a beam of length l is the beam carries M = (wl/2) x (wx/2)_______________?
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A. A load varying linearly from zero at one end to w at the other end

B. None of these

C. A uniformly distributed load w/unit length

D. An isolated load at mid span

1167. To determine the force in BD of the truss shown in the given figure a section is passed through BD, CD and CE, and the moments are taken about________________?
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A. B joint

B. C joint

C. D joint

D. A joint

1168. The moment of inertia of a circular section about any diameter D, is______________?
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A. Mar-64

B. 4/64

C. /64

D. Apr-32

1169. A material is said to be perfectly elastic if__________________?
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A. It regains its original shape on removal of the load

B. It regains its original shape partially on removal of the load

C. It does not regain its original shape at all

D. None of these

1170. A cantilever of length is subjected to a bending moment at its free end. If EI is the flexural rigidity of the section, the deflection of the free end, is_________________?
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A. ML/2EI

B. ML/3EI

C. ML/EI

D. ML/2EI

1171. If the elevation of hydraulic grade line at the junction of three pipes is above the elevation of reservoirs B and C and below reservoir A, then the direction of flow will be___________________?
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A. from reservoir A to reservoirs B and C

B. unpredictable

C. from reservoir B to reservoirs C and A

D. from reservoir C to reservoirs A and B
1172. Gradually applied static loads do not change with time their_______________?
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A. All the above

B. Magnitude

C. Direction

D. Point of application

1173. If E, N, K and 1/m are modulus of elasticity, modulus of rigidity. Bulk modulus and Poisson ratio of the material, the following relationship holds good_______________?
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A. E = 2N (1 + 1/m)

B. (3/2)K (1 2/m) = N (1 + 1/m)

C. E = 3K (1 2/m)

D. All the above
1174. d constant, the width of a cantilever of length l of uniform strength loaded with Keeping the depth a uniformly distributed load w varies from zero at the free end and________________?
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A. (3w/ l at the fixed end

B. (5w/ l at the fixed end

C. (3w/ l at the fixed end

D. (2w/ l at the fixed end

1175. The value of friction factor f for smooth pipes for Reynolds number 106 is approximately equal to________________?
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A. 0.001

B. 0.1

C. 0.0001

D. 0.01
1176. Pick up wrong statement about friction force for dry surfaces. Friction force is________________?
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A. proportional to velocity of sliding

B. independent of the area of contact surfaces

C. proportional to normal load between the surfaces

D. none of the above is wrong statement

E. dependent on the materials of contact surface

1177. The area of the core of a column of cross sectional area A, is_______________?
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A. (1/12) A

B. (1/6) A

C. (1/18) A

D. (1/3) A

1178. Stress may be expressed in Newtons___________________?
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A. Per metre square (N/m2)

B. Per millimetre square (N/mm2)

C. None of these

D. Per centimetre square (N/cm2)

1179. Principal planes are subjected to_________________?
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A. None of these

B. Normal stresses only

C. Normal stresses as well as tangential stresses

D. Tangential stresses only

1180. In steady flow of a fluid, the total accele ration of any fluid particle______________?
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A. is always zero

B. is independent of coordinates

C. can be zero

D. is never zero

1181. The locus of reaction of a two hinged semi-circular arch, is_________________?
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A. Hyperbola

B. Parabola

C. Straight line

D. Circle

1182. A simply supported beam A carries a point load at its mid span. Another identical beam B carries the same load but uniformly distributed over the entire span. The ratio of the maximum deflections of the beams A and B, will be________________?
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A. 3-Feb

B. 2-Mar

C. 8/5

D. 8-May

1183. constant, depth of a cantilever of length of uniform strength loaded with Keeping breadth uniformly distributed load varies from zero at the free end and________________?
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A. l) at the fixed end

B. 2w w l at the fixed end

C. 3w l at the fixed end

D. w l) at the fixed end

1184. For permissible shear stress fs, the torque transmitted by a thin tube of mean diameter D and wall thickness t, is________________?
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A. ( /2) t fs

B. ( /2) t fs

C. ( /4) fs

D. D2t fs

1185. In a two dimensional incompressible steady flow around an airfoil, the stream lines are 2 cm apart at a great distance from the airfoil, where the velocity is 30 m/sec. The velocity near the airfoil, where the stream lines are 1.5 cm apart, is_________________?
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A. 22.5 m/sec

B. 90 m/sec

C. 33 m/sec

D. 40 m/sec
1186. A floating body is said to be in a state of stable equilibrium_________________?
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A. when the metacentre is below the centre of gravity

B. when its metacentric height is zero

C. when the metacentre is above the centre of gravity

D. only when its centre of gravity is below its centre of buoyancy

1187. If Biochemical oxygen demand (BOD. of a town is 20000 kg/day and BOD per capita per day is 0.05 kg, then population equivalent of town is_________________?
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A. 4000

B. 100000

C. 1000

D. 400000
1188. Which of the following represents the state of neutral equilibrium ?
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A. a smooth cylinder lying on a curved surface

B. a cube resting on one edge

C. a smooth cylinder lying on a convex surface

D. none of the above
1189. If A is the amplitude of particle executing simple harmonic motion, then the total energy E of the particle is___________________?
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A. proportional to 1/A2

B. proportional to A

C. proportional to A2

D. independent of A

1190. Dissolved oxygen in streams is______________?
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A. maximum at midnight

B. maximum at noon

C. same throughout the day

D. minimum at noon

1191. A rod AB carries three loads of 30 N, 70 N and 100 N at distances of 20 mm, 90 mm and 150 mm respectively from A. Neglecting the weight of the rod, the point at which the rod will balance is_______________?
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A. 125.5 mm from A

B. 109.5 mm from A

C. 132.5 mm from A

D. 119.5 mm from A

1192. The maximum discharge of a tube-well is about_________________?
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A. 5 litres/sec

B. 50 litres/sec

C. 1000 litres/see

D. 500 litres/sec

1193. The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of________________?
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A. 100 mg/litre

B. 1 mg/litre

C. 1000 mg/litre

D. 10 mg/litre
1194. Residual chlorine in water is determined by________________?
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A. starch iodide method

B. orthotolidine method

C. both (A) and (B)

D. none of the above

1195. The type of valve, which is provided on the suction pipe in a tube-well, is____________?
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A. sluice valve

B. pressure relief valve

C. air relief valve

D. reflux valve
1196. If the time of concentration is 9 minutes, then the intensity of rainfall according to British Ministry of Health formula will be__________________?
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A. 20 mm/hr

B. 40 mm/hr

C. 4 mm/hr

D. lOmm/hr

1197. The angular speed of a car while taking a circular turn of radius 100m at 36 km/hour, is_______________?
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A. 100 radian/sec

B. 1000 radian/sec

C. 1 radian/sec

D. 0.1 radian/sec
1198. Free body diagram is an____________________?
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A. none of the above

B. isolated joint with all the forces, internal as well as external, acting on it

C. isolated joint with only body forces acting on it

D. isolated joint with internal forces acting on it

1199. The disinfection efficiency of chlorine increases by_______________?
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A. decreasing the time of contact

B. decreasing the temperature of water

C. increasing the temperature of water</strong>

D. correct answer is ?

E. only (1)

F. both (1) and (2)

1200. One end of an elastic string of natural length / and modulus X is kept fixed while to the other end is attached a particle of mass m which is hanging freely under gravity. The particle is pulled down vertically through a distance x, held at rest and then released. The motion is___________________?
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A. none of the above

B. a rectilinear motion with constant speed

C. a damped oscillatory motion

D. a simple harmonic motion