Question

Name a machine used to multiply speed.
(A)Gear system
(B)Stapler
(C)Scissors
(D)Pliers

Answer 1

In this question, we must firstly study the options given to us and then decide the function of each of these devices. From the given devices, after knowing their functions, we can deduce which of these can be used to multiply speed. This is a factual based question and needs no calculations or arguments.

Complete answer:
From the options given, we have
(A). Gear system- A gear system consists of multiple gears joined together which is used in many engineering applications. They are used to transfer motion and torque between machine components in mechanical devices. They are also responsible for changing direction of movement and to increase or decrease the output speed or torque.
(B). Stapler- It is a device with pins inside it which is used for holding paper or documents together and has nothing to do with speed.
(C). Scissor- It is used to cut paper, hair, cloth, etc and has nothing to do with speed.
(D). Pliers- It is a device which is used to hold, grip or cut wires or small pieces of objects. Even this device has got nothing to do with increasing speed.
From the above, we understand the function of each of these devices and can conclude that out of the given options, the only correct answer is Gear system. So the correct device that is responsible for increasing or multiplying speed is called the (A) Gear system.

So, the correct answer is Option A.

Additional Information:
Gear systems are the major components of trains, cars and many other such engineering devices. It is a very commonly used and irreplaceable part of mechanical systems.

Note:
In questions like these where the answer can be given correctly only when there is factual knowledge on the options, the options must be studied carefully. The method of elimination can be used in this case as the other 3 options have nothing to do with speed or increasing speed, so the only option left must be the correct option.