SECTION-3

#### Strength of Material MCQ

##### Q71. A tensile test is performed on a specimen of 4 cm2 cross-section. The maximum load on the specimen was 4000 N. The area of cross-section at neck was 2 cm2. The specimen will have the ultimate tensile stress as

(a) 1000 N/cm2
(b) 2000 N/cm2
(c) 3000 N/cm2
(d) 500 N/cm2

Ans:(a) 1000 N/cm2

##### Q72. If a support is non-yielding, it means

(a) slope of the beam at the support is zero
(b) support is frictionless
(c) support hold member firmly
(d) none of the above.

Ans:(a) slope of the beam at the support is zero

##### Q73. The elongation of a conical bar due to its own weight is equal to

(a) wl/2E
(b)wl2/6E
(c)wl3/6E
(d)wl4/6E
where l = Length of bar and w = Weight per unit volume.

Ans:(b)wl2/6E

##### Q74. If a beam is fixed at both its ends, it is called a

(a) fixed beam
(b) built-in beam
(c) encastered beam
(d) any one of the above

Ans:(d) any one of the above

##### Q75. If a beam is supported on more than two supports, it is called a

(a) built-in beam
(b) continuous beam
(c) simply supported beam
(d) encastered beam.

Ans:(b) continuous beam

##### Q76. Choose the wrong statement

(a) The shear force at any section of a beam is equal to the total sum of the forces acting on the beam on any one side of the section.
(b) The magnitude of the bending moment at any section of a beam is equal to the vector sum of the moments (about the section) due to the forces acting on the beam on any one side of the section.
(c) A diagram which shows the values of shear forces at various sections of structural member is called a shear force diagram.
(d) A simply supported beam is one which is supported on more than two supports.

Ans:(d) A simply supported beam is one which is supported on more than two supports.

##### Q77. A simply supported beam of span (l) carries a point load (W) at the centre of the beam. The shear force diagram will be

(a) a rectangle
(b) a triangle
(c) two equal and opposite rectangles
(d) two equal and opposite triangles.

Ans:(c) two equal and opposite rectangles

##### Q78. A simply supported beam of span (l) carries a uniformly distributed load over the whole span. The shear force diagram will be

(a) a rectangle
(b) a triangle
(c) two equal and opposite rectangles
(d) two equal and opposite triangles.

Ans:(d) two equal and opposite triangles.

##### Q79. A cantilever of length (l) carries a point load (W) at the free end. The shear force diagram will be

(a) two equal and opposite rectangles
(b) a rectangle
(c) two equal and opposite triangles
(d) a triangle.

Ans:(b) a rectangle

##### Q80. A cantilever of length (l) carries a uniformly distributed load over the whole length. The shear force diagram will be

(a) two equal and opposite rectangles
(b) a rectangle
(c) two equal and opposite triangles
(d) a triangle.

Ans:(d) a triangle.

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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