Theory Practice Test on Strength of Materials - Set 25 - ObjectiveBooks

# Practice Test: Question Set - 25

1. When a rectangular bar of length l, breadth b and thickness t is subjected to an axial pull of P, then linear strain (Îµ) is given by (where E = Modulus of elasticity)
(A) Îµ = P/b.t.E
(B) Îµ = b.t.E/P
(C) Îµ = b.t/P.E
(D) Îµ = P.E/b.t

2. Which of the following statement is correct?
(A) The size of hole drilled in riveting plates is less than the actual size of rivet.
(B) The center to center distance between two consecutive rivets in a row is called margin.
(C) Rivets are generally specified by its shank diameter.
(D) Tearing of plates can be avoided by taking the pitch of rivets equal to 1.5 times the diameter of rivet hole.

3. A beam of triangular section is placed with its base horizontal. The maximum shear stress occurs at
(A) Apex of the triangle
(B) Mid of the height
(C) Center of gravity of the triangle
(D) Base of the triangle

4. The Young's modulus of a material is 125 GPa and Poisson’s ratio is 0.25. The modulus of rigidity of me material is
(A) 30 GPa
(B) 50 GPa
(C) 80 GPa
(D) 100 GPa

5. In the above question, the normal stress on an oblique section will be maximum, when Î¸ is equal to
(A) 0°
(B) 30°
(C) 45°
(D) 90°

6. In a simply supported beam carrying a uniformly distributed load w per unit length, the point of contraflexure
(A) Lies in the center of the beam
(B) Lies at the ends of the beam
(C) Depends upon the length of beam
(D) Does not exist

7. In case of eccentrically loaded struts __________ is preferred.
(A) Solid section
(B) Hollow section
(C) Composite section
(D) Reinforced section

8. In a thin cylindrical shell subjected to an internal pressure p, the ratio of longitudinal stress to the hoop stress is
(A) 1/2
(B) 3/4
(C) 1
(D) 1.5

9. The unit of modulus of elasticity is same as those of
(A) Stress, strain and pressure
(B) Stress, force and modulus of rigidity
(C) Strain, force and pressure
(D) Stress, pressure and modulus of rigidity

10. The stress at which the extension of the material takes place more quickly as compared to the increase in load, is called
(A) Elastic limit
(B) Yield point
(C) Ultimate point
(D) Breaking point

11. Two bars of different materials and same size are subjected to the same tensile force. If the bars have unit elongation in the ratio of 2:5, then the ratio of modulus of elasticity of the two materials will be
(A) 2 : 5
(B) 5 : 2
(C) 4 : 3
(D) 3 : 4

12. In a thick cylindrical shell subjected to an internal pressure (p), the maximum radial stress at the inner surface of the shell is
(A) Zero
(B) p (tensile)
(C) -p (compressive)
(D) 2p (tensile)

13. When a body is subjected to direct tensile stresses (Ïƒx and Ïƒy) in two mutually perpendicular directions, accompanied by a simple shear stress Ï„xy, then in Mohr's circle method, the circle radius is taken as
(A) [(Ïƒx - Ïƒy)/2] + Ï„
(B) [(Ïƒx + Ïƒy)/2] + Ï„
(C) (1/2) × √[(Ïƒx - Ïƒy+ 4Ï„²xy]
(D) (1/2) × √[(Ïƒx + Ïƒy+ 4Ï„²xy]

14. A section of beam is said to be in pure bending, if it is subjected to
(A) Constant bending moment and constant shear force
(B) Constant shear force and zero bending moment
(C) Constant bending moment and zero shear force
(D) None of the above

15. Modular ratio of the two materials is the ratio of
(A) Linear stress to linear strain
(B) Shear stress to shear strain
(C) Their modulus of elasticities
(D) Their modulus of rigidities

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