engineering mechanics MCQs – Page 2

Practise focused engineering mechanics questions with marked answers for exam preparation and subject revision.

engineering mechanics Mcqs

21. The center of gravity of a uniform lamina lies at____________________?
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A. none of the above

B. the center of heavy portion

C. the bottom surface

D. the mid point of its axis

E. all of the above

22. A force is completely defined when we specify_______________?
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A. point of application

B. all of the above

C. direction

D. none of the above

E. magnitude

23. Which of the following do not have identical dimensions ?
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A. Torque and work

B. Torque and energy

C. Momentum and impulse

D. Moment of a force and angular momentum

E. Kinetic energy and potential energy

24. 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 up towards direction of pull

B. slant down towards direction of pull

C. none of the above

D. unpredictable

E. remain horizontal

25. 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. 3t2-lt

C. 6f-8

D. 6t2-8t

E. 3t2+2t

26. The unit of power in S.I. units is______________?
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A. joule

B. pascal per sec

C. newton meter

D. watt

E. kilogram meter/sec

27. Forces are called coplanar when all of them acting on body lie in __________________?
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A. one point

B. different points

C. perpendicular planes

D. different planes

E. one plane

28. A body moves, from rest with a constant acceleration of 5 m per sec. The distance covered in 5 sec is most nearly_________________?
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A. 124 m

B. 96 m

C. 38 m

D. 240 m

E. 62.5 m

29. A body of weight W on inclined plane of a being pulled up by a horizontal force P will be on the point of motion up the plane when P is equal to________________?
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A. W

B. Wtan(a +

C. W\an(a-)

D. W sin (a + $)

E. Wtana

30. 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. one fourth

B. same

C. double

D. half

E. four times

31. Tangent of angle of friction is equal to__________________?
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A. kinetic friction

B. limiting friction

C. friction force

D. coefficient of friction

E. angle of repose

32. The C.G. of a right circular solid cone of height h lies at the following distance from the base______________?
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A. h/6

B. J/3

C. h/4

D. 3/i/5

E. h/2

33. The co-efficient of friction depends upon_______________?
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A. A. and B. above

B. nature of surfaces

C. ail of the above.

D. shape of the surfaces

E. area of contact

34. Coulomb friction is the friction between _________________?
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A. bodies having relative motion

B. two dry surfaces

C. electrically charged particles

D. solids and liquids

E. two lubricated surfaces

35. Which of the following is not the unit of energy_________________?
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A. kcal

B. kg m

C. wattr

D. watt hours

E. kg m x (m/sec)2

36. A single force and a couple acting in the same plane upon a rigid body_____________________?
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A. are equivalent

B. balance each other

C. none of the above

D. produce moment of a couple

E. cannot balance each other

37. Center of gravity of a thin hollow cone lies on the axis at a height of ___________________?
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A. none of the above

B. one-half of the total height above base

C. one-fourth of the total height above base

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

E. one-third of the total height above base

38. 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. hyperbola

B. catenary

C. parabola

D. circular arc

E. elliptical

39. Limiting force of friction is the__________________?
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A. ratio of limiting friction and normal reaction

B. tangent of angle between normal-reaction and the resultant of normal reaction and limiting friction

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

D. the friction force acting when the body is in motion

E. minimum force of friction

40. A pair of smiths tongs is an example of the lever of__________________?
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A. zeioth order

B. second order

C. fourth order

D. third order

E. first order

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