MOS/Imp questions on Solid mechanics for civil or mechanical engineering aspirants-Part 03

 1) The tensile force required to cause elongation of 0.045 mm in a steel rod of 1000 mm length and 12 mm diameter, is (where E = 2 x 106 kg/cm2)

A. 166 kg

B. 102 kg

C. 204 kg

D. 74 kg

Answer:  B

2) Struts are load-carrying members of a frame structure which are subjected to

A. axial tension loads

B. axial compressive loads

C. torsional loads

D. transverse loads.

Answer:  B

3) In a bar of large length when held vertically and subjected to a load at its lower end, its own-weight produces additional stress. The maximum stress will be

A. at the lower cross-section

B. at the built-in upper cross-section

C. at the central cross-section

D. at every point of the bar.

Answer:  B

4) A simply supported wooden beam 150 cm long and having a cross-section 16 cm x 24 cm carries a concentrated load, at the center. If the permissible stress ft = 75 kg/cm2 and fs = 10 kg/cm2 the safe load is

A. 3025 kg

B. 3050 kg

C. 3075 kg

D. 3100 kg.

Answer: C

5) A solid cube is subjected to equal normal forces on all its faces. The volumetric strain will be x-times the linear strain in any of the three axes when

A. x = 1

B. x = 2

C. x = 3

D. x = 4

Answer: C

6) n and j are numbers of members and joints in a frame. It contains redundant members if

A. n = 2j - 3

B. n = 3j - 2

C. n < 2j - 3

D. n < j - 2

E. n > 2j - 3

Answer: E

7) The materials which have the same elastic properties in all directions are called

A. isotropic

B. brittle

C. homogeneous

D. hard.

Answer:  A

8) In a three-hinged arch, the third hinge is generally kept at

A. crown of the arch

B. midpoint of the crown and left support hinge

C. midpoint of the crown and right support hinge

D. none of these.

Answer:  A

9) A bending moment may be defined as :

A. An arithmetic sum of the moments of all the forces on either side of the section

B. An arithmetic sum of the forces on either side of the section

C. The algebraic sum of the moments of all the forces on either side of the section

D. None of these.

Answer: Option C

10) The property of a material by which it can be beaten or rolled into thin plates, is called

A. malleability

B. ductility

C. plasticity

D. elasticity.

Answer: A

11) If a constant section beam is subjected to a uniform bending moment throughout, its length bends to

A. a circular arc

B. a parabolic arc

C. a catenary

D. none of these.

Answer: A

12) A simply supported beam (l + 2a) with equal overhangs (a) carries a uniformly distributed load over the whole length, the B.M. changes sign if

A. l > 2a

B. l < 2a

C. l = 2a

D. l = 4a

E. l = 3a.

Answer: A

13) The type of butt joints in common use is :

A. single inverted V-butt joint

B. double V-butt joint

C. double U-butt joint

D. single V-butt joint.

Answer: A

14) For structural analysis, Maxwell's reciprocal theorem can be applied to :

A. plastic structures

B. elastic structures

C. symmetrical structures

D. all the above.

Answer: B

15) The moment diagram for a cantilever carrying a concentrated load at its free end will be

A. triangle

B. rectangle

C. parabola

D. cubic parabola.

Answer:  A

16) In a shaft rotated by a couple, the shear force varies

A. from zero at the center to a maximum at the circumference

B. from a minimum at the center of maximum at the circumference

C. from the maximum at the center to zero at the circumference

D. equally throughout the section

E. none of these.

Answer:  A

17) The shape of the bending moment diagram over the length of a beam, carrying a uniformly increasing load, is always

A. linear

B. parabolic

C. cubical

D. circular.

Answer:  C

18) When a rectangular beam is loaded longitudinally, shear develops on

A. bottom fiber

B. top fiber

C. middle fiber

D. every-horizontal plane.

Answer: D

19) The tension coefficient of any member is

A. force divided by the length

B. tension divided by the length

C. tension per unit area

D. tension in the member.

Answer: B

20) If the width b and depth d of a beam simply supported with a central load are interchanged, the deflection at the center of the beam will be changed in the ratio of

A. b/d

B. d/b

C. (d/b)2

D. (b/d)2

E. (b/d)3.

Answer: D

21) The strain energy of a member may be equated to

A. average resistance x displacement

B. stress x strain x area of its cross-section

C. stress x strain x volume of the member

D. (stress)2 x volume of the member + Young's modulus E.

Answer:  D

22) If the stress in each cross-section of a pillar is equal to its working stress, it is called

A. body of equal

B. body of the equal section

C. body of equal strength

D. none of these.

Answer: C

23) The stress at which extension of a material takes place more quickly as compared to the increase in load is called

A. elastic point

B. plastic point

C. breaking point

D. yielding point.


24) In a square beam loaded longitudinally, shear develops

A. on the middle fiber along the horizontal plane

B. on the lower fiber along the horizontal plane

C. on the top fiber along the vertical plane

D. equally on each fiber along the horizontal plane

E. none of these.

Answer: D

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