Multiple Choice Questions on Strength of Materials - Set 12 - ObjectiveBooks

# Practice Test: Question Set - 12

1. A circular shaft fixed at, A has diameter D for half of its length and diameter D/2 over the other half, as shown in the below figure. If the rotation of B relative to A is 0.1 radian, the rotation of C relative to B will be

2. The shear force diagram of a cantilever beam of length ‘l’ and carrying a uniformly distributed load of w per unit length will be
(A) A right angled triangle
(B) An isosceles triangle
(C) An equilateral triangle
(D) A rectangle

3. The safe twisting moment for a compound shaft is equal to the
(A) Maximum calculated value
(B) Minimum calculated value
(C) Mean value
(D) Extreme value

4. When a bar is subjected to a change of temperature and its deformation is prevented, the stress induced in the bar is
(A) Tensile stress
(B) Compressive stress
(C) Shear stress
(D) Thermal stress

5. A thin mild steel wire is loaded by adding loads in equal increments till it breaks. The extensions noted with increasing loads will behave as under
(A) Uniform throughout
(B) Increase uniformly
(C) First increase and then decrease
(D) Increase uniformly first and then increase rapidly

6. Which of the following is a proper sequence?
(A) Proportional limit, elastic limit, yielding, failure
(B) Elastic limit, proportional limit, yielding, failure
(C) Yielding, proportional limit, elastic limit, failure
(D) None of the above

7. Which is the false statement about true stress strain method?
(A) It does not exist
(B) It is more sensitive to changes in both metallurgical and mechanical conditions
(C) It gives a more accurate picture of the ductility
(D) It can be correlated with stress strain values in other tests like torsion, impact, combined stress tests etc.

8. The bending equation is
(A) M/I = σ/y = E/R
(B) T/J = τ/R = Cθ/l
(C) M/R = T/J = Cθ/l
(D) T/l= τ/J = R/Cθ

9. For which material the Poisson's ratio is more than unity
(A) Steel
(B) Copper
(C) Aluminium
(D) None of the above

10. When a body is subjected to a direct tensile stress (σ) in one plane, then maximum normal stress occurs at a section inclined at _________ to the normal of the section.
(A) 0°
(B) 30°
(C) 45°
(D) 90°

11. Flow stress corresponds to
(A) Fluids in motion
(B) Breaking point
(C) Plastic deformation of solids
(D) Rupture stress

12. The thickness of a thin cylindrical shell with hemispherical ends is _________ that of spherical ends.
(A) Equal to
(B) More than
(C) Less than
(D) None of these

13. A riveted joint in which every rivet of a row is opposite to other rivet of the outer row, is known as
(A) Chain riveted joint
(B) Diamond riveted joint
(C) Crisscross riveted joint
(D) Zigzag riveted joint

14. The maximum tangential stress in a thick cylindrical shell is always _________ the internal pressure acting on the shell.
(A) Equal to
(B) Less than
(C) Greater than
(D) None of these

15. If percentage reduction in area of a certain specimen made of material 'A' under tensile test is 60% and the percentage reduction in area of a specimen with same dimensions made of material 'B' is 40%, then
(A) The material A is more ductile than material B
(B) The material B is more ductile than material A
(C) The ductility of material A and B is equal
(D) The material A is brittle and material B is ductile

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