Question

Which one of the following class I lever has the mechanical advantage more than 1?

• A. Seesaw
• B. A pair of scissors
• C. Claw Hammer
• D. A physical balance

Answer 1

The correct option is B

A pair of scissors

Depending upon the relative positions of the effort, load and fulcrum, levers are classified into 3 types.

(1) $ClassIlevers$

(2) $ClassIIlevers$

(3) $ClassIIIlevers$

For $ClassIlevers$, the mechanical advantage can have any value either greater than 1, equal to 1 or less than 1.

MA of a lever $=\frac{Effortarm}{Loadarm}$

If Effort arm > load arm, then M.A >1.

In claw hammer, effort arm is greater than load arm.

So, M.A>1