_______________is an example of Third-class lever.(a) Fishing rod (b) Beam-balance (c) Nutcracker

To determine which option is an example of a third-class lever, we need to understand what a third-class lever is. In a third-class lever, the effort force is located between the fulcrum and the load.

(a) A fishing rod: A fishing rod is not an example of a third-class lever because the effort force is applied at one end (the handle), the load (the fish) is at the other end, and the fulcrum is located in the middle.

(b) A beam-balance: A beam-balance is not an example of a third-class lever because it is a type of weighing scale that uses a balanced beam and does not involve the use of effort force, load, or a fulcrum.

(c) A nutcracker: A nutcracker is an example of a third-class lever. The fulcrum is located at one end, the effort force is applied in the middle, and the load (the nut) is at the other end. When the handles of the nutcracker are squeezed together, the effort force is applied to crack the nut.

Therefore, the correct answer is (c) Nutcracker.