State the class of lever to which sugar tongs belong giving the relative positions of Load$\left(L\right)$, Effort$\left(E\right)$ and Fulcrum$\left(F\right)$.

State the class of lever to which nutcracker belong giving the relative positions of Load$\left(L\right)$, Effort$\left(E\right)$ and Fulcrum$\left(F\right)$.

Figure given below gives an arrangement of moving and fixed pulleys. Copy the diagram and show the direction and magnitude of forces exerted by the four strings marked $1$ to $4$. What is the load that can be lifted by the effort $E$? Calculate the mechanical advantage of this system.

The given figure shows a simple lever. What class of lever this figure belongs to? What is the minimum effort to overcome the load of $100 \mathrm{N}$?

The given figure shows a simple lever. What is the mechanical advantage of lever if efficiency of the lever is $100\%$?