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Mechanical Engineering Objective Questions { Strength of Materials }



22. If a part is constrained to move and heated, it will develop
A.Principal stress
B.Tensile stress
C.Compressive stress
D.Shear stress

23. Which of the following materials is most elastic
A.Rubber
B.Plastic
C.Brass
D.Steel

24. The value of modulus of elasticity for mild steel is of the order of
A.2.1 x 105 kg/cm2
B.2,1 X 106 kg/cm2
C.2.1 x 107 kg/cm2
D.0.1x 106 kg/cm2

25. The value of Poisson's ratio for steel is between
A.0.01 to 0.1
B.0.23 to 0.27
C.0.25 to 0.33
D.0.4 to 0.6

26. 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.Slenderness ratio, area of cross-section and modulus of elasticity

27. 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.One-fourth of weight of bar applied at lower end

28. 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

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