strength of materials MCQs – Page 2

Practise focused strength of materials questions with marked answers for exam preparation and subject revision.

strength of materials Mcqs
21. Which of the following is not the unit of pressure ?
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A. atmosphere

B. kg/cm

C. ata

D. newton

E. mm of wcl

22. A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to______________?
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A. 100

B. 50

C. 500

D. 250

E. 25

23. On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be__________________?
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A. downwards at its upper end

B. zero at its upper end

C. upwards at its upper end

D. perpendicular to the wall at its upper end

E. none of the above

24. The necessary condition for forces to be in equilibrium is that these should be_______________?
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A. coplanar

B. meet at one point ;

C. both A. and B. above

D. all be equal

E. something else

25. A particle inside a hollow sphere of radius r, having coefficient of friction -rr can rest upto height of__________________?
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A. r/A

B. 0.134 r

C. 3r/8

D. r/2

E. r/%

26. The unit of work or energy in S.I. units is________________?
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A. joule

B. newton

C. pascal

D. kilogram meter

E. watt

27. When trying to turn a key into a lock, following is applied___________________?
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A. non-coplanar forces

B. moment

C. lever

D. coplanar force

E. couple
28. The resultant of the following three couples 20 kg force, 0.5 m arm, $ ve sense 30 kg force, 1 m arm, ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be_________________?
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A. 10 kg, + ve sense

B. 20 kg, ve sense

C. 45 kg, + ve sense

D. 20 kg, + ve sense

E. 10 kg, ve sense

29. 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

30. 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

31. 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

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

B. force

C. moment

D. velocity

E. weight
33. 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
34. 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

35. 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
36. 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

37. 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
38. 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

39. 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

40. 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