civil engineering MCQs – Page 165

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 Review each marked answer and report any item that may be outdated or unclear.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
3281. A particle is dropped from a height of 3 m on a horizontal floor, which has a coefficient of restitution with the ball of 1/2. The height to which the ball will rebound after striking the floor is____________________?
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A. 1.5 m

B. 0.5 m

C. 1.0 m

D. 0.75 m
3282. 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

3283. The dimensions of power are_______________?
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A. ML-T*

B. ML2T2

C. MLr2

D. MLT3
3284. If y is force and x is velocity, then dimensions of =r are dx2__________________?
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A. ML-T1

B. M^T

C. M2LT3

D. ML-T0
3285. The condilion for a lifting machine to be reversible is that its efficiency should be_________________?
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A. more than 66.67%

B. equal to 100%

C. less than 50%

D. more than 50%
3286. Coefficient of friction depends on__________________?
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A. nature of surfaces only

B. area of contact only

C. both (A) and (B)

D. none of the above

3287. Select the correct statement ?
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A. The body centrode rolls on the space centrode

B. The space centrode rolls on the body centrode

C. Both body and space centrodes may role on each other

D. The body centrode never touches space centrode

3288. A solid cylinder of mass M and radius R rolls down an inclined plane without slipping. The acceleration of center of mass of rolling cylinder is________________?
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A. g sin 9

B. (2/3) g cos 9

C. (1/3) g sinB

D. (2/3) g sin 0
3289. A ladder of weight w rests against a smooth vertical wall, and rests on rough horizontal ground, the coefficient of friction between the ladder and the ground being 1/4. The maximum angle of inclination of the ladder to the vertical, if a man of weight w is to walk to the top of it safely, is tan1 x, where x is___________________?
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A. 4

B. 1/3

C. 4-Jan

D. 3

3290. The shape of a suspended cable for a uniformly distributed load over it is__________________?
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A. catenary

B. parabolic

C. cubic parabola

D. circular

3291. The maximum displacement of a particle executing S.H.M. corresponds to__________________?
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A. zero kinetic energy and maximum potential energy

B. minimum kinetic energy and minimum potential energy

C. maximum kinetic energy and maxi-mum potential energy

D. zero potential energy and maximum kinetic energy

3292. 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-Feb

B. 5-Mar

C. 3-Jan

D. 1/5
3293. The member forces in a statically in determinate truss____________________?
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A. may be obtained by graphic statics

B. cannot be obtained by graphic statics

C. can be obtained by graphic statics by trial and error

D. can be obtained by graphic statics

3294. Williot-Mohr diagram is used to determine deflection in__________________?
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A. trusses only

B. rigid frames only

C. any type of structure

D. beam only

3295. Time period and length of a seconds pendulum respectively are_________________?
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A. 1 sec and 92.7 cm

B. 2 sec and 99.4 cm

C. 1 sec and 99.4 cm

D. 2 sec and 92.7 cm

3296. A quantity whose dimensions are M2L2 T3 could be the product of_________________?
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A. energy and velocity

B. mass and power

C. force and pressure

D. force and velocity

3297. A system of copianar forces acting on a rigid body can be reduced to________________?
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A. none of the above

B. one force and one couple only

C. one couple only

D. one force only

3298. A sphere and a cylinder having the same mass and radii start from rest and roll down the same inclined plane. Which body gets to the bottom first ?
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A. sphere with greater rotational energy at bottom than cylinder

B. sphere with lesser rotational energy at bottom than cylinder

C. cylinder with greater rotational energy at bottom than sphere

D. both reach the bottom simultaneously with equal rotational energy at bottom

3299. If the given forces P,, P2, P3 and P4 are such that the force polygon does not close, then the system will___________________?
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A. be in equilibrium

B. always reduce to a resultant force

C. always reduce to a couple

D. both (A) and (C)

3300. A car goes round a curve of radius 100 m at 25 m/sec. The angle to the horizontal at which the road must be banked to prevent sideways friction on the car wheels is tan1 x, where x is (Assume g = 10 m/sec2)_____________________?
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A. 2-Jan

B. 8-Mar

C. 5/8

D. 5-Sep