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

For a simply supported beam with a central point load, the bending moment diagram forms a triangle with its peak value at the midpoint load location.

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

For a rectangular section, I = bh³/12, so the moment of inertia — and bending resistance — increases with the cube of depth, making depth the most efficient dimension to increase.

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

A cantilever has one fixed (built-in) support that resists both shear and bending moment, while the opposite end is free — like a diving board or a balcony.

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

A UDL applies a constant force per unit length along the beam, such as the self-weight of the beam itself or a uniformly loaded floor slab.

Question 5

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

Accepted Answer

Only axial forces — either tension or compression

Answer

In an ideal truss with pin connections at joints, no bending moment can be transferred through a pin, so each member carries only axial tension or compression.

Mechanical Aptitude Test Practice Test

Mechanical Aptitude Test Practice Test

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