SECTION-3

STRENGTH OF MATERIAL OBJECTIVE QUESTIONS/MCQ

##### Q1. 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) more/less depending on composition

Ans: (b) less

##### Q2. If a part is constrained to move and heated, it will develop

(a) principal stress

(b) tensile stress

(c) compressive stress

(d) shear stress

Ans: (c) compressive stress

##### Q3. 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

Ans: (c) 0.25 to 0.33

##### Q4. 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

Ans: (b) elasticity

##### Q5. The materials which exhibit the same elastic properties in all directions are called

(a) homogeneous

(b) inelastic

(c) isotropic

(d) isentropic

Ans: (c) isotropic

##### Q6. The greatest twisting moment which a given shaft section can resist is equal to

(a) polar modulus × τ
(b) polar modulus/τ
(c) τ/polar modulus
(d) none of the above.

Ans:(a) polar modulus × τ

##### Q7. Choose the correct statement

(a) Shafts of the same material and length having the same polar modulus have the same strength.
(b) For a shaft of a given material, the magnitude of polar modulus is a measure of its strength in resisting torsion.
(c) From a number of shafts of the same length and material the shaft with greatest polar modulus will resist the maximum twisting moment.
(d) all of the above.

Ans:(d) all of the above.

##### Q8. Two shafts, one solid and the other hollow, are made of the same materials and are having same length and weight. The hollow shaft as compared to solid shaft is

(a) more strong
(b) less strong
(c) having same strength
(d) none of the above.

Ans:(a) more strong

##### Q9. Two shafts, one solid and the other hollow, are of same length and material. They are subjected to the same torque and attain the same permissible maximum shear stress at the same time. The weight of hollow shaft will be

(a) more
(b) less
(c) same as of solid shaft
(d) none of the above.

Ans:(b) less

##### Q10. The flexural rigidity of the deflection of beams is expressed as

(a) I/E
(b) E/I
(c) EI
(d) I/EI
where E = Modulus of elasticity and I = Moment of inertia.

Ans:(c) EI

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##### Read More Sections of Strength of Material

Each section contains maximum 80 Questions. To practice more questions visit other sections.

Strength of Material MCQ – Section-1

Strength of Material MCQ – Section-2

Strength of Material MCQ – Section-3

Strength of Material MCQ – Section-4

Strength of Material MCQ – Section-5

Strength of Material MCQ – Section-6

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