SOM Objective Practice Test - Set 30 - ObjectiveBooks
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# Practice Test: Question Set - 30

1. In a beam subjected to pure bending, the intensity of stress in any fibre is _________ the distance of the fibre from the neutral axis.
(A) Equal to
(B) Less than
(C) More than
(D) Directly proportional to

2. The relation between Young's modulus (E) and bulk modulus (K) is given by
(A) k = (3m - 2)/m.E
(B) k = m.E/(3m - 2)
(C) k = 3(m - 2)/m.E
(D) k = m.E/3(m - 2)

3. The shear force of a cantilever beam of length l carrying a uniformly distributed load of w per unit length is __________ at the fixed end.
(A) Zero
(B) wl/4
(C) wl/2
(D) wl

4. The strength of the shaft is judged by the_____________.
(A) Torque transmitted by the shaft
(B) Length of the shaft
(C) Dia. of the shaft
(D) None of these

5. A simply supported beam 'A' of length l, breadth b, and depth d carries a central point load W. Another beam 'B' has the same length and depth but its breadth is doubled. The deflection of beam 'B' will be __________ as compared to beam 'A'.
(A) One-fourth
(B) One-half
(C) Double
(D) Four times

6. In a simple bending theory, one of the assumptions is that the material of the beam is isotropic. This assumption means that the
(A) Normal stress remains constant in all directions
(B) Normal stress varies linearly in the material
(C) Elastic constants are same in all the directions
(D) Elastic constants varies linearly in the material

7. The maximum deflection of a fixed beam carrying a central point load lies at
(A) Fixed ends
(B) Center of beam
(C) l/3 from fixed ends
(D) None of these

8. The shear stress at the center of a circular shaft under torsion is
(A) Zero
(B) Minimum
(C) Maximum
(D) Infinity

9. A body is subjected to a direct tensile stress of 300 MPa in one plane accompanied by a simple shear stress of 200 MPa. The maximum normal stress will be
(A) -100 MPa
(B) 250 MPa
(C) 300 MPa
(D) 400 MPa

10. When a closely-coiled helical spring is subjected to an axial load, it is said to be under
(A) Bending
(B) Shear
(C) Torsion
(D) Crushing

11. In a beam where shear force changes sign, the bending moment will be
(A) Zero
(B) Minimum
(C) Maximum
(D) Infinity

12. The strength of the unriveted or solid plate per pitch length is
(A) d.t.σc
(B) p.tt
(C) (p - d) t.σt
(D) π/2 ×× τ

13. The tensile test is carried on __________ materials.
(A) Ductile
(B) Brittle
(C) Malleable
(D) Plastic

14. The bending moment diagram for a simply supported beam loaded in its center is
(A) A right angled triangle
(B) An isosceles triangle
(C) An equilateral triangle
(D) A rectangle

15. A bar of length ‘L’ meters extends by ‘l’ mm under a tensile force of ‘P’. The strain produced in the bar is
(A) l/L
(B) 0.1 l/L
(C) 0.01 l/L
(D) 0.001 l/L

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