Strength of Materials Objective Questions with Answers - Set 10 - ObjectiveBooks

# Practice Test: Question Set - 10

1. Young's modulus is defined as the ratio of
(A) Volumetric stress and volumetric strain
(B) Lateral stress and lateral strain
(C) Longitudinal stress and longitudinal strain
(D) Shear stress to shear strain

2. The layer at the center of gravity of the beam as shown in the below figure, will be

(A) In tension
(B) In compression
(C) Neither in tension nor in compression
(D) None of these

3. When a body is subjected to a direct tensile stress (σx) in one plane accompanied by a simple shear stress (τxy), the minimum normal stress is
(A) x/2) + (1/2) × √(σx² + 4 τ²xy)
(B) x/2) - (1/2) × √(σx² + 4 τ²xy)
(C) x/2) + (1/2) × √(σx² - 4 τ²xy)
(D) (1/2) × √(σx² + 4 τ²xy)

4. Tensile strength of a material is obtained by dividing the maximum load during the test by the
(A) Area at the time of fracture
(B) Original cross-sectional area
(C) Average of (A) and (B)
(D) Minimum area after fracture

5. The section modulus of a circular section about an axis through its C.G., is
(A) π/4
(B) π/16
(C) πd3/16
(D) πd3/32

6. If a part is constrained to move and heated, it will develop
(A) Principal stress
(B) Tensile stress
(C) Compressive stress
(D) Shear stress

7. The moment of resistance of a balanced reinforced concrete beam is based on the stresses in
(A) Steel only
(B) Concrete only
(C) Steel and concrete both
(D) None of these

8. The property of a material by virtue of which it can be beaten or rolled into plates is called
(A) Malleability
(B) Ductility
(C) Plasticity
(D) Elasticity

9. In case of an under-reinforced beam, the depth of actual neutral axis is __________ that of the critical neutral axis.
(A) Same as
(B) Less than
(C) Greater than
(D) None of these

10. The energy absorbed in a body, when it is strained within the elastic limits, is known as
(A) Strain energy
(B) Resilience
(C) Proof resilience
(D) Modulus of resilience

11. A simply supported beam with a gradually varying load from zero at ‘B’ and ‘w’ per unit length at ‘A’ is shown in the below figure. The shear force at ‘B’ is equal to

(A) wl/6
(B) wl/3
(C) wl
(D) 2wl/3

12. A fletched beam is used to
(A) Change the shape of the beam
(B) Effect the saving in material
(C) Equalize the strength in tension and compression
(D) Increase the cross-section of the beam

13. Percentage reduction in area performing tensile test on cast iron may be of the order of
(A) 50%
(B) 25%
(C) 20%
(D) 30%

14. A beam is loaded as cantilever. If the load at the end is increased, the failure will occur
(A) In the middle
(B) At the tip below the load
(C) At the support
(D) Anywhere

15. The assumption made in Euler's column theory is that
(A) The failure of column occurs due to buckling alone
(B) The length of column is very large as compared to its cross-sectional dimensions
(C) The column material obeys Hooke's law
(D) All of the above

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