SECTION-5

Strength of Material MCQ

Q71. For most brittle materials, the ultimate strength in compression is much large than the ultimate strength in tension. This is mainly due to

(a) presence of flaws and microscopic cracks or cavities
(b) necking in tension
(c) severity of tensile stress as compared to compressive stress
(d) non-linearity of stress-strain diagram.

Ans: (a) presence of flaws and microscopic cracks or cavities

Q72. The temperature stress is a function of

1. Co-efficient of linear expansion
2. Temperature rise
3. Modulus of elasticity. The correct answer is
(a) 1 and 2 only

(b) 1 and 3 only
(c) 2 and 3 only

(d) 1, 2 and 3 only.

Ans: (d) 1, 2 and 3 only.

Q73. When two springs of equal lengths are arranged to form a cluster spring then which of the following statements are true :

1. Angle of twist in both the springs will be equal
2. Deflection of both the springs will be equal
3. Load taken by each spring will be half the total load
4. Shear stress in each spring will be equal
(a) 1 and 2 only

(b) 2 and 3 only
(c) 3 and 4 only

(d) 1, 2 and 4 only.

Ans: (c) 3 and 4 only

Q74. When σ and Young’s modulus of elasticity E remains constant, the energy absorbing capacity of part subjected to dynamic forces, is a function of its

(a) length

(b) cross-section
(c) volume

(d) none of the above.

Ans: (c) volume

Q75. In case of bi-axial state of normal stresses, the normal stress on 45° plane is equal to

(a) sum of normal stresses

(b) difference of normal stresses
(c) half the sum of normal stresses

(d) half the difference of normal stresses.

Ans: (c) half the sum of normal stresses

Q76. The buckling load will be maximum for a column, if

(a) one end of the column is clamped and other end is free
(b) both ends of the column are clamped
(c) both ends of the column are hinged
(d) one end of the column is hinged and other end is free.

Ans: (b) both ends of the column are clamped

(a) k

(b) 1.25 k
(c) 1.56 k

(d) 1.95 k.

Ans: (c) 1.56 k

(a) 5 mm

(b) 10 mm

(c) 20 mm

(d) 25 mm.

Ans: (d) 25 mm.

(a) 0.25

(b) 0.50
(c) 2.0

(d) 4.0

Ans: (c) 2.0

Q80. In the assembly of pulley, key and shaft

(a) pulley is made the weakest

(b) key is made the weakest
(c) key is made the strongest
(d) all the three are designed for equal strength.

Ans: (b) key is made the weakest

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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