Which of the following contains moving parts?

A)
Machines
B)
Truss
C)
Beam
D)
Frames

Correct Answer : Option (A) :   Machines


Explanation : The machines are constructed in such a way that the moving parts are contained. Machines are built to have moving parts since they are used in a variety of fields. They’re also made in such a way that the working bits within aren’t damaged.