# SOM | STRENGTH OF MATERAILS | OBJECTIVE

1. The unit of stress in S.I. unit is ? N/mm² , KN/mm² , N/m²
2. The deformation per unit length is called ? Strain
3. The unit of strain is ? no unit
4. Strain is equal to  ?  ΔL/L

ΔL = change in length , L = original length

5. Which of the following is a proper sequence ?

Proportional Limit , elastic limit , yielding , failure

7. When a body is subjected to two equal and opposite pulls, as a result of which the body tends to extends its length the stress and strain induced to  ?

tensile stress , tensile strain

8. 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 ?

shear stress , shear strain

9. Hook's law holds good up to ? elastic limit

10. The ratio of linear stress to the linear strain is called  ?  modulus of elasticity

11. The unit of modulus of elasticity is same as those of  ?

stress , pressure and modulus of rigidity

12. When a change in length takes place, the strain is known as ?

Linear strain

13. The modulus of elasticity for mild steel is approximately equal to ? 210 KN/mm²

14. Young's modulus may be defined as the ration of  ?

Linear stress to linear strain

15. Modulus of rigidity may be defined as the ratio of  ?

shear stress to shear strain

16. Strain rosetters are used to ? measure linear strain

17. When a bar is cooled to --5°C,  it will develop ? tensile stress

18. Strain is defined as the ratio of ?

Change is volume to original volume

Change in length to original length

Change is cross-sectional area to original cross-sectional area

19. The materials having same elastic properties in all directions are called ?

Isotropic material

20. The impact strength of a material is an index of its ?

toughness

21. The intensity of stress which causes unit strain is called ?

modulus of rigidity

22. The value of Poisson's ratio for steel is between ?

0.24 to 0.33

23 . The buckling load for a given material depends on ?

slenderness ratio, area of cross-section and modulus of elasticity

24. The property of a material by virtue of which  a body returns to its original shape after removal of the load is called ?  Elasticity

25. The value of Poisson's ratio for cast iron is ?

0.23 to 0.33

26. The property of a material which allows it to be drawn into a smaller section is called ?   Ductility

27. Poisson's ratio is defined as the ratio of  ?

Lateral stress and longitudinal stress

28. The property of a material by virtue of which it can be between or rolled into plates is called ?   Malleability

29. The stress developed in a material at breaking point in extension is called ?

Breaking stress

30. Flow stress corresponds to ?

Plastic deformation of solids

MECHANICAL ENGINEERING OBJECTIVE BOOKS

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