SECTION-4

#### Strength of Material MCQ

##### Q31. Principal stresses are the stresses acting normal to

(a) a plane
(b) an oblique plane
(c) a principal plane
(d) a plane having minimum shear stress.

Ans:(c) a principal plane

(a) 1000 N
(b) 750 N
(c) 433 N
(d) 0.

Ans:(b) 750 N

(a) 1000 N
(b) 750 N
(c) 433 N
(d) 0.

Ans:(c) 433 N

##### Q34. A member of cross-sectional area 10 cm2 is subjected to an axial load of 10,000 N. A plane makes an angle of 30° to the cross-section, the plane makes an angle of 60° instead of 30° to the cross-section, the normal stress on 60° plane will be

(a) double of 30° plane
(b) equal to 30° plane
(c) half of 30° plane
(d) one-third of 30° plane.

Ans:(d) one-third of 30° plane.

##### Q35. A member of cross-sectional area 10 cm2 is subjected to an axial load of 10,000 N. A plane makes an angle of 30° to the cross-section, the plane makes an angle of 60° instead of 30° to the cross-section, the shear or tangential stress on 60° plane will be

(a) double of 30° plane
(b) equal to 30° plane
(c) half of 30° plane
(d) one-third of 30° plane.

Ans:(b) equal to 30° plane

(a)p /2 sin 2θ
(b) p cos θ
(c) p cos2 θ
(d) p sin2 θ.

Ans:(c) p cos2 θ

(a) 90°
(b) 45°
(c) 0o
(d) 30°.

Ans:(c) 0o

##### Q38. The tangential or shear stress on an oblique plane at an angle θ to the cross-section of a body which is subjected to a direct tensile stress (p) is equal to

(a)p/2 sin 2θ
(b) p cos θ
(c) p cos2 θ
(d) p sin2 θ.

Ans:(a)p/2 sin 2θ

(a) 90°
(b) 45°
(c) 0°
(d) 30°

Ans:(b) 45°

##### Q40. The cross-sectional area of a rod is 10 cm2. A pull of 10 tonnes is suddenly applied to the rod. The maximum stress produced in the rod would be

(a) 1 tonne/cm2
(b) 2 tonne/cm2
(c) 0.5 tonne/cm2
(d) 4 tonne/cm2 .

Ans:(b) 2 tonne/cm2

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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