### Civil Engineering - Strength of Materials MCQs Part 5

1. The stress necessary to initiate yielding, is considerably

A.
more than that necessary to continue it
B.
less than that necessary to continue it
C.
more than that necessary to stop it
D.
less than that necessary to stop it.

2. If a circular beam of diameter d experiences a longitudinal strain and a lateral strain the volumetric strain is

A.
B.
C.
D.
E.
none of these.

3. Strain energy of any member may be defined as work done on it

A.
to deform it
B.
to resist elongation
C.
to resist shortening
D.
all the above.

4. If the length of a cantilever carrying an isolated load at its free end is doubled, the deflection of the free end will increase by

A.
8
B.
1/8
C.
1/3
D.
2
E.
3

5. If b is the width of a plate joined by diamond riveting of diameter d, the efficiency of the joint is given by

A.
B.
C.
D.

6. The B.M. diagram of the beam shown in below figure, is

A. a rectangle
B. a triangle
C. a trapezium
D. a parabola
E. a circle.

7. The value of Poisson's ratio always remains

A. greater than one
B. less than one
C. equal to one
D. none of these.

8. For a beam having fixed ends, the unknown element of the reactions, is

A. horizontal components at either end
B. vertical components at either end
C. horizontal component at one end and vertical component at the other
D. horizontal and vertical components at both the ends.

9. If all the dimensions of a bar are increased in the proportion n : 1, the proportion with which the maximum stress produced in the prismatic bar by its own weight, will increase in the ratio

A. 1 : n
B. n : 1
C. 1 :
D. : 1
E. 1 : n.

10. The slenderness ratio of a vertical column of square cross- section of 10 cm side and 500 cm long, is

A. 117.2
B. 17.3
C. 173.2
D. 137.2
E. 13.72

11. If the depth of a simply supported beam carrying an isolated load at its centre, is doubled, the deflection of the beam at the centre will be changed by a factor of

A. 2
B. 1/2
C. 8
D. 1/8
E. 4

12. The equivalent length of a column fixed at one end and free at the other end, is

A. 0.5 l
B. 0.7 l
C. l
D. 2 l
E. 1.5 l.

13. A cast iron T section beam is subjected to pure bending. For maximum compressive stress to be three times the maximum tensile stress, centre of gravity of the section from flange side is

A. h/4
B. h/3
C. h/2
D. 2/3 h.

14. The equivalent length of a column fixed at both ends, is

A. 0.5 l
B. 0.7 l
C. l
D. 2 l
E. 1.5 l.

15. The rise of a parabolic arch at quarter points, is equal to

A. times the rise of the crown
B. times the rise of the crown
C. times the rise of the crown
D. times the rise of the crown
E. times the rise of the crown.

16. The effect of arching a beam, is

A. to reduce the bending moment throughout
B. to increase the bending moment throughout
C. nothing on the bending throughout
D. ail the above.

17. The phenomenon of slow growth of strain under a steady tensile stress, is called

A. yielding
B. creeping
C. breaking
D. none of these.

18. Hooke's law states that stress and strain are

A. directly proportional
B. inversely proportional
C. curvilinearly related
D. none of these.

19. If S is the shear force at a section of an I-joist, having web depth d and moment of inertia I about its neutral axis, the difference between the maximum and mean shear stresses in the web is,

A.
B.
C.
D.

20. A 8 metre long simply supported rectangular beam which carries a distributed load 45 kg/m. experiences a maximum fibre stress 160 kg/cm2. If the moment of inertia of the beam is 640 cm4, the overall depth of the beam is

A. 10 cm
B. 12 cm
C. 15 cm
D. 16 cm
E. 18 cm.

21. A column is said to be of medium size if its slenderness ratio is between

A. 20 and 32
B. 32 and 120
C. 120 and 160
D. 160 and 180
E. 180 and 200

22. A solid circular shaft of diameter d is subjected to a torque T. The maximum normal stress induced in the shaft, is

A. zero
B.
C.
D. none of these.

23. If p is the internal pressure in a thin cylinder of diameter d and thickness t, the developed hoop stress, is

A.
B.
C.
D.
E.

24. Ties are load carrying members of a frame, which are subjected to

25. At either end of a plane frame, maximum number of possible transverse shear forces, are

A. one
B. two
C. three
D. four
E. zero.

26. The cross sections of the beams of equal length are a circle and a square whose permissible bending stress are same under same maximum bending. The ratio of their flexural weights is,

A. 1.118
B. 1.338
C. 1.228
D. 1.108

27. When two plates butt together and are riveted with two cover plates with two rows of rivets, the joint is known as

A. lap joint
B. butt join
C. single riveted single cover butt joint
D. double riveted double cover butt joint.

28. The moment diagram for a cantilever which is subjected to a uniformly distributed load will be a

A. triangle
B. rectangle
C. parabola
D. cubic parabola.

29. The areas of cross-section of a square beam and a circular beam subjected to equal bending moments, are same.

A. circular beam is more economical
B. square beam is more economical
C. both the beams are equally strong
D. both the beams are equally economical
E. none of these.

30. For the same height, the bottom width for no tension,

A. for triangular section is more than rectangular section
B. for rectangular section is more than triangular section
C. for triangular section is same as that of a rectangular section
D. none of these.

31. Maximum deflection of a

A. Cantilever beam carrying a concentrated load W at its free end is
B. simply supported beam carrying a concentrated load W at mid-span is
C. cantilever beam, carrying a uniformly distributed load over span is
D. simply supported beam carrying a uniformly distributed load over the span is
E. All the above.

32. A beam is said to be of uniform strength, if

A. B.M. is same throughout the beam
B. shear stress is same throughout the beam
C. deflection is same throughout the beam
D. bending stress is same at every section along its longitudinal axis.

33. For a beam, if fundamental equations of statics are not sufficient to determine all the reactive forces at the supports, the structure is said to be

A. determinate
B. statically determinate
C. statically indeterminate
D. none of these.

34. The moment diagram for a cantilever carrying linearly varying load from zero at its free end and to maximum at the fixed end will be a

A. triangle
B. rectangle
C. parabola
D. cubic parabola.

35. The maximum deflection of

A. a simply supported beam carrying a uniformly increasing load from either end and having the apex at the mid span is
B. a fixed ended beam carrying a distributed load over the span is
C. a fixed ended beam carrying a concentrated load at the mid span is
D. a cantilever beam subjected to a moment M at the free end is
E. All the above.

36. If two tensile forces mutually perpendicular act on a rectangular parallelopiped bar are equal, the resulting elongation of the pipe, is

A.
B.
C.
D.
E.

37. The intensity of direct longitudinal stress in the cross-section at any point distant r from the neutral axis, is proportional to

A. r
B.
C. r2
D.
E. r3.

6. The B.M. diagram of the beam shown in below figure, is

A. a rectangle
B. a triangle
C. a trapezium
D. a parabola
E. a circle.

7. The value of Poisson's ratio always remains

A. greater than one
B. less than one
C. equal to one
D. none of these.

8. For a beam having fixed ends, the unknown element of the reactions, is

A. horizontal components at either end
B. vertical components at either end
C. horizontal component at one end and vertical component at the other
D. horizontal and vertical components at both the ends.

9. If all the dimensions of a bar are increased in the proportion n : 1, the proportion with which the maximum stress produced in the prismatic bar by its own weight, will increase in the ratio

A. 1 : n
B. n : 1
C. 1 :
D. : 1
E. 1 : n.

10. The slenderness ratio of a vertical column of square cross- section of 10 cm side and 500 cm long, is

A. 117.2
B. 17.3
C. 173.2
D. 137.2
E. 13.72