Strength of Materials online Test - Set 06 - ObjectiveBooks
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# Practice Test: Question Set - 06

1. When a closely-coiled helical spring of mean diameter (D) is subjected to an axial load (W), the deflection of the spring (δ) is given by (where d = Diameter of spring wire, n = No. of turns of the spring, and C = Modulus of rigidity for the spring material)
(A) WD3n/Cd⁴
(B) 2WD3n/Cd⁴
(C) 4WD3n/Cd⁴
(D) 8WD3n/Cd⁴

2. Percentage reduction of area in performing tensile test on cast iron may be of the order of
(A) 50%
(B) 25%
(C) 0%
(D) 15%

3. For the beam shown in the below figure, the shear force diagram between A and B is

(A) A horizontal line
(B) A vertical line
(C) An inclined line
(D) A parabolic curve

4. When a body is subjected to a direct tensile stress x) in one plane accompanied by a simple shear stress xy), the maximum 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)

5. The materials which exhibit the same elastic properties in all directions are called
(A) Homogeneous
(B) Inelastic
(C) Isotropic
(D) Isentropic

6. Modulus of rigidity may be defined as the ratio of
(A) Linear stress to lateral strain
(B) Lateral strain to linear strain
(C) Linear stress to linear strain
(D) Shear stress to shear strain

7. The ratio of lateral strain to the linear strain within elastic limit is known as
(A) Young's modulus
(B) Bulk modulus
(C) Modulus of rigidity
(D) Poisson's ratio

8. In the below figure, the plastic range occurs

(A) Before point A
(B) Beyond point A
(C) Between points A and D
(D) Between points D and E

9. Shear modulus is the ratio of
(A) Linear stress to linear strain
(B) Linear stress to lateral strain
(C) Volumetric strain to linear strain
(D) Shear stress to shear strain

10. The ratio of elongation in a prismatic bar due to its own weight (W) as compared to another similar bar carrying an additional weight (W) will be
(A) 1 : 2
(B) 1 : 3
(C) 1 : 4
(D) 1 : 2.5

11. The weakest section of a diamond riveting is the section which passes through
(A) The first row
(B) The second row
(C) The central row
(D) One rivet hole of the end row

12. The shear force diagram for a simply supported beam carrying a uniformly distributed load of w per unit length, consists of
(A) One right angled triangle
(B) Two right angled triangles
(C) One equilateral triangle
(D) Two equilateral triangles

13. Hooke's law holds good up to
(A) Yield point
(B) Limit of proportionality
(C) Breaking point
(D) Elastic limit

14. Which of the following statement is correct?
(A) The stress is the pressure per unit area
(B) The strain is expressed in mm
(C) Hook's law holds good up to the breaking point
(D) Stress is directly proportional to strain within elastic limit

15. The property of a material which allows it to be drawn into a smaller section is called
(A) Plasticity
(B) Ductility
(C) Elasticity
(D) Malleability

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