Objective Questions and Answer: Mechanics & Strength of Materials 10

Subject: Mechanics & Strength of Materials 10

**Part 10: Objective questions and answers of Mechanics & Strength Of Materials**

**Q1. Whenever some external system of forces acts on a body, it undergoes some deformation the body undergoes some deformation, it sets up some resistance to the deformation. This resistance per unit area to deformation, is called**

a) Strain

b) Stress

c) Pressure

d) Modulus of elasticity

**Q2. The deformation per unit length is called**

a) Tensile stress

b) Compressive stress

c) Shear stress

d) Strain

**Q3. The unit of strain is**

a) N-mm

b) N/mm

c) Mm

d) No unit

**Q4. When a body is subjected to two equal and opposite pushes, as a result of which the body tends to reduce its length, the stress and strain induced is**

a) Compressive stress, tensile strain

b) Tensile stress, compressive strain

c) Tensile stress, tensile strain

d) Compressive stress, compressive strain

**Q5. When a body is subjected to two equal and opposite forces, acting tangentially across the resisting section, as a result of which the body tends to shear off across the section, the stress and strain induced is**

a) Tensile stress, tensile strain

b) Compressive stress, compressive strain

c) Shear stress, tensile strain

d) Shear stress, shear strain

**Q6. Which of the following is a proper sequence?**

a) Proportional limit, elastic limit, yielding, failure

b) Elastic limit, proportional limit, yielding, failure

c) Yielding, proportional limit, elastic limit, failure

d) None of the above

**Q7. Hook's law holds good up to**

a) Yield point

b) Elastic limit

c) Plastic limit

d) Breaking point

**Q8. Whenever a material is loaded within elastic limit, stress is __________ strain**

a) Equal to

b) Directly proportional to

c) Inversely proportional to

d) None of the above

**Q9. The ratio of linear stress to the linear strain is called**

a) Modulus of rigidity

b) Modulus of elasticity

c) Bulk modulus

d) Poisson's ratio

**Q10. The unit of modulus of elasticity is same as those of**

a) Stress, strain and pressure

b) Stress, force and modulus of rigidity

c) Strain, force and pressure

d) Stress, pressure and modulus of rigidity

**Q11. When a change in length takes place, the strain is known as**

a) Linear strain

b) Lateral strain

c) Volumetric strain

d) Shear strain

**Q12. Young's modulus 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

**Q13. 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

**Q14. The deformation of a bar under its own weight is____the deformation, if the same body is subjected to a direct load equal to weight of the body**

a) Equal to

b) Half

c) Double

d) Quadruple

**Q15. The elongation of a conical bar under its own weight is____that of prismatic bar of the same length.**

a) Equal to

b) Half

c) One-third

d) Two-third

**Q16. Strain rosetters are used to**

a) Measure shear strain

b) Measure linear strain

c) Measure volumetric strain

d) Relieve strain

**Q17. The ultimate tensile stress for mild steel is______the ultimate compressive stress.**

a) Equal to

b) Less than

c) More than

d) None of the above

**Q18. The maximum stress produced in a bar of tapering section is at**

a) Smaller end

b) Larger end

c) Middle

d) Anywhere

**Q19. Modular ratio of the two materials is the ratio of**

a) Linear stress to linear strain

b) Shear stress to shear strain

c) Their modulus of elasticity's

d) Their modulus of rigidity

**Q20. The shear modulus of most materials with respect to the modulus of elasticity is**

a) Equal to half

b) Less than half

c) More than half

d) None of these

**Part 10: Objective questions and answers of Mechanics & Strength Of Materials**

Q1. Answer b

Q2. Answer d

Q3. Answer d

Q4. Answer d

Q5. Answer d

Q6. Answer a

Q7. Answer b

Q8. Answer b

Q9. Answer b

Q10. Answer d

Q11. Answer a

Q12. Answer c

Q13. Answer d

Q14. Answer b

Q15. Answer c

Q16. Answer b

Q17. Answer c

Q18. Answer a

Q19. Answer c

Q20. Answer b