civil engineering MCQs – Page 275

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 Review each marked answer and report any item that may be outdated or unclear.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

5481. The M.I. of hollow circular section about a central axis perpendicular to section as compared to its M.I. about horizontal axis is_________________?
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A. double

B. half

C. four times

D. one fourth

E. same

5482. A force is completely defined when we specify________________?
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A. none of the above

B. direction

C. all of the above

D. magnitude

E. point of application

5483. According to Lamis theorem________________?
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A. three forces acting at a point can be represented by a triangle, each side being proportional to force

B. none of the above

C. three forces acting at a point will be in equilibrium

D. if three forces acting upon a particle are represented in magnitude and

E. if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two

F. ection by the sides of a triangle, taken in order, they will be in equilibrium

5484. Which of the following is not a vector quantity_______________?
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A. acceleration

B. force

C. moment

D. velocity

E. weight

5485. Which of the following is not the unit of distance ?
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A. light year

B. millimeter

C. micron

D. angstrom

E. milestone

5486. 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. 3 and 1 kg

B. 2 and 5

C. none of the above

D. V5andV5

E. 2 and V6

5487. In detennining stresses in frames by methods of sections, the frame is divided into two parts by an imaginary section drawn in such a way as not to cut more than___________________?
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A. four members with unknown forces of the frame

B. three members with known forces of the frame

C. four members with two known forces

D. two members with unknown forces of the frame

E. three members with unknown forces of the frame

5488. A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will____________________?
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A. slant down towards direction of pull

B. slant up towards direction of pull

C. none of the above

D. remain horizontal

E. unpredictable

5489. Center of gravity of a solid cone lies on the axis at the height_______________?
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A. one-half of the total height above base

B. none of the above

C. three-eighth of the total height above the base

D. one-third of the total height above base

E. one-fourth of the total height above base

5490. Center of gravity of a thin hollow cone lies on the axis at a height of________________?
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A. one-third of the total height above base

B. three-eighth of the total height above the base

C. none of the above

D. one-fourth of the total height above base

E. one-half of the total height above base

5491. A heavy string attached at two ends at same horizontal level and when central dip is very small approaches the following curve___________________?
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A. catenary

B. circular arc

C. elliptical

D. parabola

E. hyperbola

5492. In the equation of virtual work, following force is neglected_______________?
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A. reaction at a point or an axis, fixed in space, around which a body is con-strained to turn

B. all of the above

C. reaction of a rough surface of a body which rolls on it without slipping

D. reaction of any smooth surface with which the body is in contact

E. none of the above

5493. Forces are called coplanar when all of them acting on body lie in________________?
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A. different planes

B. different points

C. perpendicular planes

D. one point

E. one plane

5494. Kinetic friction is the________________?
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A. the friction force acting when the body is in motion

B. ratio of limiting friction and normal reaction

C. dynamic friction

D. tangent of angle between normal reac-tion and the resultant of normal reac-tion and the limiting friction

E. the friction force acting when the body is just about to move

5495. The centre of percussion of a solid cylinder of radius r resting on a horizontal plane will be______________?
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A. r/2

B. 3r/A

C. 3r/2

D. r/A

E. 2r/3

5496. In actual machines______________?
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A. none of the above

B. mechanical advantage is greater than velocity ratio

C. mechanical advantage is less than velocity ratio

D. mechanical advantage is unity

E. mechanical advantage is equal to velocity ratio

5497. A trolley wire weighs 1.2 kg per meter length. The ends of the wire are attached to two poles 20 meters apart. If the horizontal tension is 1500 kg find the dip in the middle of the span________________?
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A. 2.0 cm

B. 4.0 cm

C. 2.5 cm

D. 3.0 cm

E. 5.0 cm

5498. A single force and a couple acting in the same plane upon a rigid body________________?
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A. cannot balance each other

B. are equivalent

C. balance each other

D. none of the above

E. produce moment of a couple

5499. The center of gravity of a triangle lies at the point of__________________?
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A. intersection of its altitudes

B. all of the above

C. intersection of diagonals

D. intersection of bisector of angles

E. concurrence of the medians

5500. The center of gravity of a uniform lamina lies at_______________?
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A. the center of heavy portion

B. the bottom surface

C. all of the above

D. the mid point of its axis

E. none of the above

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