SECTION-5

#### Strength of Material MCQ

##### Q21. Torsional rigidity of a shaft is equal to

(a) product of modulus of rigidity and polar moment of inertia
(b) sum of modulus of rigidity and polar moment of inertia
(c) difference of modulus of rigidity and polar moment of inertia
(d) ratio of modulus of rigidity and polar moment of inertia.

Ans:(a) product of modulus of rigidity and polar moment of inertia

##### Q22. Polar modulus of a shaft section is equal to

(a) product of polar moment of inertia and maximum radius of the shaft
(b) ratio of polar moment of inertia to maximum radius of the shaft
(c) sum of polar moment of inertia and maximum radius of the shaft
(d) difference of polar moment of inertia and maximum radius of the shaft.

Ans:(b) ratio of polar moment of inertia to maximum radius of the shaft

##### Q23. The stress obtained by dividing the load at the moment of incipient fracture, by the area supporting that load is called

(a) proof stress
(b) flow stress
(c) rupture stress
(d) ultimate stress.

Ans:(c) rupture stress

(a) Mohr
(b) Castigliano
(c) Max well
(d) Rankine.

Ans:(c) Max well

(a) square
(b) rectangle
(c) circle
(d) rhombus.

Ans:(d) rhombus.

(a) square
(b) rectangle
(c) circle
(d) rhombus.

Ans:(c) circle

##### Q27. Choose the correct statement

(a) Section modulus of a hollow circular section of external diameter D and internal diameter d is
equal to π (D4-d4)/64D
(b) Section modulus of a circular section on diameter D is πD4/32
(c) section modulus of a rectangular section is bd2/6
(d) Section modulus of a square section b × b is b4/12

Ans:(c) section modulus of a rectangular section is bd2/6

##### Q28. A beam of uniform strength can be designed by

(a) varying the depth of the beam but maintaining constant width
(b) varying the width of the beam but maintaining constant depth
(c) varying width and dept
(d) any one of the above

Ans:(d) any one of the above

##### Q29. A cantilever of length (l) carries a point load (W) at a distance x from the fixed end, then the deflection at the free end will be

$\text { (a) } \frac{W x^{3}}{3 E I}+\frac{W x^{2}}{2 E I} \times l$

(b) WI3/3EI

$\text { (c) } \frac{W x^{3}}{3 E I}+\frac{W x^{2}}{2 E I}(l-x)$

$\text { (d) } \frac{W x^{3}}{2 E I}+\frac{W x^{2}}{3 E I}(l-x)$

Ans:$\text { (c) } \frac{W x^{3}}{3 E I}+\frac{W x^{2}}{2 E I}(l-x)$

##### Q30. A cantilever of length (l) carries a uniformly distributed load of w per unit length for a distance x from the fixed end, then the deflection at the free end will be

$(a) \frac{W x^{4}}{8 E I}+\frac{W x^{3}}{6 E I} \times l$

(b) Wx4/8EI

(c)  EI4/8EI

$(d) \frac{W x^{4}}{8 E I}+\frac{W^{3} x}{8 E I} \times(1-x) .$

Ans:$(d) \frac{W x^{4}}{8 E I}+\frac{W^{3} x}{8 E I} \times(1-x) .$

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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