Strength Of Materials MCQ Questions & Answers

1

The bending moment in the center of a simply supported beam carrying a uniformly distributed load of w per unit length is

A) Zero B) $$\frac{{{\text{w}}{l^2}}}{2}$$ C) $$\frac{{{\text{w}}{l^2}}}{4}$$ D) $$\frac{{{\text{w}}{l^2}}}{8}$$

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Answer & Solution

Answer: Option D

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2

The shear force at the ends of a simply supported beam carrying a uniformly distributed load of w per unit length is

A) Zero at its both ends B) $${\text{w}}l$$ at one end and $$ - {\text{w}}l$$ at the other end C) $$\frac{{{\text{w}}l}}{2}$$ at one end and $$ - \frac{{{\text{w}}l}}{2}$$ at the other end D) $$\frac{{{\text{w}}{l^2}}}{2}$$ at one end and $$ - \frac{{{\text{w}}{l^2}}}{2}$$ at the other end

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Answer & Solution

Answer: Option C

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3

Proof resilience per material is known as

A) Resilience B) Proof resilience C) Modulus of resilience D) Toughness

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Answer & Solution

Answer: Option C

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4

In the below figure, curve D represents_________.
Strength of Materials mcq question image

A) Mild steel B) Cast iron C) Concrete D) Bone of these

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Answer & Solution

Answer: Option A

Solution:

5

The maximum diameter of the hole that can be punched from a plate of maximum shear stress $${\frac{1}{4}^{{\text{th}}}}$$ of its maximum crushing stress of punch, is equal to (where t = Thickness of the plate)

A) 1t B) 2t C) 4t D) 8t

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Answer & Solution

Answer: Option C

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6

A rod is enclosed centrally in a tube and the assembly is tightened by rigid washers. If the assembly is subjected to a compressive load, then

A) Rod is under compression B) Tube is under compression C) Both rod and tube are under compression D) Tube is under tension and rod is under compression

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Answer & Solution

Answer: Option C

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7

A composite bar made up of steel and copper bars of equal lengths are heated through 100°C. The stresses developed shall be

A) Tensile in both the material B) Tensile in steel and compressive in copper C) Compressive in steel and tensile in copper D) Compressive in both the materials

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Answer & Solution

Answer: Option B

Solution:

When a composite bar made up of different materials, such as steel and copper, is heated, it experiences thermal expansion. Since steel has a higher coefficient of thermal expansion compared to copper, the following stress distribution occurs:

Steel (outer material) expands more and tends to elongate, resulting in tensile stress. Copper (inner material) expands less and tends to contract, resulting in compressive stress.

So, in a composite bar made up of steel and copper bars of equal lengths heated through 100°C, the stresses developed shall be tensile in steel and compressive in copper. This is represented by Option B.

8

The extension of a circular bar tapering uniformly from diameter d₁ at one end to diameter d₂ at the other end and subjected to an axial pull of ‘P’ is given by

A) $$\delta l = \frac{{4{\text{PE}}}}{{\pi {l^2}}}$$ B) $$\delta l = \frac{{4\pi l{{\text{d}}^2}}}{{{\text{PE}}}}$$ C) $$\delta l = \frac{{4{\text{P}}l}}{{\pi {\text{E}}{{\text{d}}_1}{{\text{d}}_2}}}$$ D) $$\delta l = \frac{{4{\text{P}}l{\text{E}}}}{{\pi {{\text{d}}_1}{{\text{d}}_2}}}$$

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Answer & Solution

Answer: Option C

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9

The polar moment of inertia of a solid circular shaft of diameter (D) is

A) $$\frac{{\pi {{\text{D}}^3}}}{{16}}$$ B) $$\frac{{\pi {{\text{D}}^3}}}{{32}}$$ C) $$\frac{{\pi {{\text{D}}^4}}}{{32}}$$ D) $$\frac{{\pi {{\text{D}}^4}}}{{64}}$$

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Answer & Solution

Answer: Option C

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10

The polar modulus for a solid shaft of diameter (D) is

A) $$\frac{{\pi {{\text{D}}^2}}}{4}$$ B) $$\frac{{\pi {{\text{D}}^3}}}{{16}}$$ C) $$\frac{{\pi {{\text{D}}^3}}}{{32}}$$ D) $$\frac{{\pi {{\text{D}}^4}}}{{64}}$$

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Answer & Solution

Answer: Option B

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Strength Of Materials MCQ Questions &amp; Answers | Mechanical Engineering

Strength Of Materials MCQ Questions & Answers | Mechanical Engineering