Mechanical Aptitude Test Mechanical Aptitude Structural Mechanics and Materials Questions and Answers 3

Question 1

For a simply supported beam carrying a single concentrated load at its midpoint, maximum bending moment occurs at:

Accepted Answer

The center of the beam directly under the load

Answer

Each support reaction point

Answer

One-third of the span from each end

Answer

The quarter-span points

Question 2

Increasing the depth of a rectangular beam cross-section is the most effective way to increase its bending resistance because the moment of inertia increases with:

Accepted Answer

The cube of the depth

Answer

The square of the width

Answer

The square of the depth

Answer

Linearly with the depth

Question 3

A cantilever beam is defined as one that is:

Accepted Answer

Fixed at one end only, with the other end completely free

Answer

Supported at both ends with a free span between them

Answer

Suspended by cables from above at multiple points

Answer

Supported at the center with both ends overhanging

Question 4

A uniformly distributed load (UDL) on a beam means the load is:

Accepted Answer

Spread evenly per unit length along the entire beam

Answer

Applied at a single point at midspan

Answer

Concentrated at one end of the beam

Answer

Applied as a moment at the supports

Question 5

In an ideal pin-jointed truss, individual members carry:

Accepted Answer

Only axial forces — either tension or compression

Answer

Bending moments and transverse shear forces

Answer

Torsional (twisting) loads along their length

Answer

Distributed lateral pressure loads

Question 6

Factor of Safety (FoS) in structural design is defined as:

Accepted Answer

Ultimate (failure) strength divided by the allowable working stress

Answer

Applied load divided by the self-weight of the structure

Answer

Yield stress divided by Young's Elastic Modulus

Answer

Design live load divided by the dead load