Question

What is the use of the lever if its mechanical advantage is
More than 1
Less than 1
= to 1

Answer 1

if more than 1 means class 2 lever which acts as a force multiplier..
less than 1: class 3 lever which is used for gain in speed....
=to 1 :lever 1 used as force multiplier

Answer 2

If the Mechanical advantage is more than 1 or equal to one it acts as a force multiplier and if it is less than one other acts as speed multiplier.
Hope it is helpful.