Free Online Practice test on Strength of materials - Set 14 - ObjectiveBooks

# Practice Test: Question Set - 14

1. A key is subjected to side pressure as well at shearing forces. These pressures are called
(A) Bearing stresses
(B) Fatigue stresses
(C) Crushing stresses
(D) Resultant stresses

2. When a closely-coiled helical spring of mean diameter (D) is subjected to an axial load (W), the stiffness of the spring is given by
(A) Cd⁴/D3n
(B) Cd⁴/2D3n
(C) Cd⁴/4D3n
(D) Cd⁴/8D3n

3. During a tensile test on a specimen of 1 cm cross-section, maximum load observed was 8 tonnes and area of cross-section at neck was 0.5 cm². Ultimate tensile strength of specimen is
(A) 4 tonnes/ cm²
(B) 8 tonnes/ cm²
(C) 16 tonnes/ cm²
(D) 22 tonnes/ cm²

4. When a body is subjected to a direct tensile stress (σx) in one plane accompanied by a simple shear stress (τxy), the maximum shear 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 change in the unit volume of a material under tension with increase in its Poisson's ratio will
(A) Increase
(B) Decrease
(C) Remain same
(D) Increase initially and then decrease

6. A material capable of absorbing large amount of energy before fracture is known as
(A) Ductility
(B) Toughness
(C) Resilience
(D) Shock proof

7. The shear force at the ends of a simply supported beam carrying a uniformly distributed load of w per unit length is
(A) Zero at its both ends
(B) wl at one end and -wl at the other end
(C) wl/2 at one end and -wl/ 2 at the other end
(D) wl²/2 at one end and -wl²/ 2 at the other end

8. Deformation per unit length in the direction of force is known as
(A) Strain
(B) Lateral strain
(C) Linear strain
(D) Linear stress

9. Which of the following statement is correct?
(A) The energy stored in a body, when strained within elastic limit is known as strain energy.
(B) The maximum strain energy which can be stored in a body is termed as proof resilience.
(C) The proof resilience per unit volume of a material is known as modulus of resilience.
(D) All of the above

10. Rupture stress is
(A) Breaking stress
(D) Load at breaking point/neck area

11. When two shafts of same length, one of which is hollow, transmit equal torques and have equal maximum stress, then they should have equal
(A) Polar moment of inertia
(B) Polar modulus
(C) Diameter
(D) Angle of twist

12. Longitudinal stress in a thin cylinder is
(A) Equal to the hoop stress
(B) Twice the hoop stress
(C) Half of the hoop stress
(D) One fourth of hoop stress

13. A beam of uniform strength may be obtained by
(A) Keeping the width uniform and varying the depth
(B) Keeping the depth uniform and varying the width
(C) Varying the width and depth both
(D) Any one of the above

14. Which of the following has no unit?
(A) Kinematic viscosity
(B) Surface tension
(C) Bulk modulus
(D) Strain

15. The deformation of the bar per unit length in the direction of the force is known as
(A) Linear strain
(B) Lateral strain
(C) Volumetric strain
(D) Shear strain

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