Strength of Materials objective questions with answers part1

Q1. If a part is constrained to move and heated, it will develop
(A) principal stress
(B) tensile stress
(C) compressive stress
(D) None of these

Q2. In a tensile test on mild steel specimen, the breaking stress as compared to ultimate tensile stress is
(A) more
(B) less
(C) same
(D) None of these

Q3. Which is the false statement about true stress-strain method
(A) It does not exist
(B) It is more sensitive to changes in both metallurgical and mechanical conditions
(C) It gives, a more accurate picture of the ductility
(D) None of these

Q4. Which of the following has no unit
(A) kinematic viscosity
(B) surface tension
(C) bulk modulus
(D) strain

Q5. For steel, the ultimate strength in shear as compared to in tension is nearly
(A) same
(B) half
(C) one-third
(D) one-fourth

Q6. The intensity of stress which causes unit strain is called
(A) unit stress
(B) bulk modulus
(C) modulus of rigidity
(D) modulus of elasticity

Q7. Percentage reduction of area in performing tensile test on cast iron may be of the order of
(A) 50.00%
(B) 0.25
(C) 0.00%
(D) 30

Q8. The Young’s modulus of a wire is defined as the stress which will increase the length of wire compared to its original length
(A) half
(B) same amount
(C) double
(D) double

Q9. The impact strength of a material is an index of its
(A) toughness
(B) tensile strength
(C) hardness
(D) softness

Q10. 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 and
(D) None of these

Q11. The ultimate tensile stress of mild steel compared to ultimate compressive stress is
(A) same
(B) more
(C) less
(D) None of these

Q12. If the radius of wire stretched by a load is doubled, then its Young’s modulus will be
(A) doubled
(B) become four times
(C) become one-fourth
(D) remain unaffected

Q13. Modulus of rigidity is defined as the ratio of
(A) longitudinal stress and longitudinal strain
(B) lateral stress and lateral strain
(C) shear stress and shear strain
(D) None of these

Q14. A thin mild steel wire is loaded by adding loads in equal increments till it breaks. The extensions noted with increasing loads will behave as under
(A) uniform throughout
(B) increase uniformly
(C) first increase and then decrease
(D) first descrease and then increase

Q15. The materials having same elastic properties in all directions are called
(A) ideal materials
(B) uniform materials
(C) isotropic materials
(D) None of these

Q16. It equal and opposite forces applied to a body tend to elongate it, the stress so produced is called
(A) internal resistance
(B) tensile stress
(C) transverse stress
(D) None of these

Q17. Deformation per unit length in the direction of force is known as
(A) strain
(B) lateral strain
(C) linear strain
(D) stress

Q18. 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) None of these

Q19. Hooke’s law holds good up to
(A) yield point
(B) limit of proportionality
(C) breaking point
(D) None of these

Q20. Strain is defined as the ratio of
(A) change in volume to original volume
(B) change in length to original length
(C) change in cross-sectional area to original cross-sectional area
(D) Any of these