Between pliers and scissors, which one has mechnaical advantsge less than one?

Both scissors and pliers belongs to the same class which is class 1 lever.

 

Mechanical advantage is given by,

 

 

 

For scissor, the lever is as follows:

 

Thus, from figure we can say that effort arm is less than load arm.

Thus, mechanical advantage is less than 1.

 

While for pliers, the figure for lever is as follows:

 

 

From the above figure, effort arm is greater than load arm.

Thus, mechanical advantage is greater than 1.