Strength of Materials objective questions with answers part2

Q1. The elasticity of various materials is controlled by its
(A) ultimate tensile stress
(B) proof stress
(C) stress at yield point
(D) stress at elastic limit

Q2. Rupture stress is
(A) breaking stress
(B) maximum load/original cross-sectional area
(C) Maximum load/Area
(D) load at breaking point/neck area

Q3. The stress developed in a material at breaking point in extension is called
(A) breaking stress
(B) fracture stress
(C) yield point stress
(D) None of these

Q4. In the tensile test, the phenomenon of slow extension of the material, i. e. stress increasing with the time at a constant load is called
(A) creeping
(B) yielding
(C) breaking
(D) None of these

Q5. The stress necessary to initiate yielding is
(A) considerably greater than that necessary to continue it
(B) considerably lesser than that necessary to continue it
(C) greater than that necessary to stop it
(D) less than that necessary to stop it

Q6. In a tensile test, near the elastic limit zone, the
(A) tensile strain increases more quickly
(B) tensile strain decreases more quickly
(C) tensile strain increases in proportion to the stress
(D) None of these

Q7. If a material expands freely due to heating it will develop
(A) thermal stresses
(B) tensile stress
(C) compressive stress
(D) no stress

Q8. The percentage reduction in area of a cast iron specimen during tensile test would be of the order of
(A) more than 50%
(B) 25—50%
(C) 50—100%
(D) negligible

Q9. 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) None of these

Q10. 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

Q11. For which material the Poisson’s ratio is more than unity
(A) steel
(B) aluminium
(C) cast iron
(D) None of these

Q12. Poisson’s ratio is defined as the ratio of
(A) longitudinal stress and longitudinal strain
(B) longitudinal stress and lateral stress
(C) lateral stress and longitudinal stress
(D) None of these

Q13. 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

Q14. The value of Poisson’s ratio for cast iron is
(A) 0.15 to 0.2
(B) 0.23 to 0.27
(C) 0.25 to 0.33
(D) 0.025 to 0.033

Q15. materials which exhibit the same elastic properties in all directions are called
(A) homogeneous
(B) inelastic
(C) isotropic
(D) None of these

Q16. The property of a material by virtue of which a body returns to its original, shape after removal of the load is called
(A) plasticity
(B) elasticity
(C) ductility
(D) malleability

Q17. The total elongation produced in a bar of uniform section hanging vertically downwards due to its own weight is equal to that produced by a weight
(A) of same magnitude as that of bar and applied at the lower end
(B) half the weight of bar applied at lower end
(C) half of the square of weight of bar applied at lower end
(D) None of these

Q18. The buckling load for a given material depends on
(A) slenderness ratio and area of cross-section
(B) Poisson’s ratio and modulus of elasticity
(C) slenderness ratio and modulus of elasticity
(D) None of these

Q19. The value of Poisson’s ratio for steel is between
(A) 0.012 to 0.15
(B) 0.23 to 0.27
(C) 0.25 to 0.33
(D) 0.025 to 0.033

Q20. Which of the following materials is most elastic
(A) plastic
(B) brass
(C) rubber
(D) steel