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Strength of Materials Mcqs

Q:

The rate of change of shear force is equal to _____

A) Direction of load B) Change in BMD
C) Intensity of loading D) Maximum bending
 
Answer & Explanation Answer: C) Intensity of loading

Explanation: Not available for this question

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762
Q:

Limit of proportionality depends upon ____________

A) Area of cross-section B) Type of loading
C) Type of material D) All of the mentioned
 
Answer & Explanation Answer: A) Area of cross-section

Explanation: The proportionality limit is proportional to the area of cross-section. The material type and loading type will have no influence on the proportionality limit.

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743
Q:

A rod 150cm long and of diameter 2cm is subjected to an axial pull of 20kN. What will be the stress?

A) 60 N/mm² B) 65 N/mm²
C) 63.6 N/mm² D) 71.2 N/mm²
 
Answer & Explanation Answer: C) 63.6 N/mm²

Explanation: The stress = load / area
Load = 20,000N
Area = ?/4 (20)2 = 100? mm².

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707
Q:

At the extreme fibre, bending stress is______

A) Minimum B) Zero
C) Constant D) Maximum
 
Answer & Explanation Answer: D) Maximum

Explanation: Bending stress is defined as the resistance offered by internal stress to bending. In beams, stresses occurs above or below the neutral axis i.e at the extreme fibres. Hence bending stress is maximum at the extreme fibres.

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659
Q:

In steel sections, the junction between a flange and web is known as ________

A) Edge B) Fillet
C) Corner D) Lug
 
Answer & Explanation Answer: B) Fillet

Explanation: In a steel section, the junction between the flange and the web is known as fillet. The connections solve issues of complex geometry for joining the members of a central hub while they provide the standard connection through out. They are not readily available.

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651
Q:

A steel bar 600mm long and having 30mm diameter, is turned down to 25mm diameter for one fourth of its length. It is heated at 30 C above room temperature, clamped at both ends and then allowed to cool to room temperature. If the distance between the clamps is unchanged, the maximum stress in the bar ( ? = 12.5 x 10-6 per C and E = 200 GN/m²) is

A) 25 MN/m² B) 40 MN/m²
C) 50 MN/m² D) 75 MN/m²
 
Answer & Explanation Answer: D) 75 MN/m²

Explanation: As temperature stress do not depend upon properties of cross section like length and area. They only depends upon properties of the material.
Therefore, ?=?E?T
= 12.5 x 10-6 x 200 x 10³ x 30
= 75 MN/m².

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593
Q:

A tensile test was conducted on a mild steel bar. The diameter and the gauge length of bat was 3cm and 20cm respectively. The extension was 0.21mm. What is the value to strain?

A) 0.0010 B) 0.00105
C) 0.0105 D) 0.005
 
Answer & Explanation Answer: B) 0.00105

Explanation: Strain = dL/L = 0.21/200 = 0.0005.

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474
Q:

How many elastic constants of a non homogeneous, non isotropic material will be?

A) 9 B) 15
C) 20 D) 21
 
Answer & Explanation Answer: D) 21

Explanation: Non isotropic or anisotropic materials have different properties in different directions. They show non- homogeneous behaviour. The number of elastic constants is 21.

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