Question

A doorknob is an example of a screw.
A. True
B. False

Answer 1

Hint: Go through the concept of machine. Also remind all the types of the simple machines and details of these types of simple machines.

Complete step by step answer:
The device which is used to change the direction or magnitude of the force is known as the simple machine. The machines make working with different equipment easy.
There are six basic types of machine which are screw, wheel and axle, lever, pulley, inclined plane and wedge.
A screw is also a simple machine that is used to convert the rotational motion in linear motion or a rotational force (torque) to a linear force.
A door knob or door handle is used to open or close the door easily.
A wheel and axle is a simple machine in which the axle attaches the object to the wheel.
A door knob has an axle in the middle with a wheel. Therefore, a doorknob is an example of a simple machine and not a screw.
Hence, the option A is incorrect.

So, the correct answer is “Option B.

Additional Information:
A machine is a mechanical structure that uses power to apply forces and control movement to perform an intended action
There are basically six types of machine:
The inclined plane - Used for raising a load by means of a smaller applied force.
The lever - Involves a load, a fulcrum and an applied force.
The pulley - In simplest form it changes the direction of a force acting along a cord or rope.
The screw
The wedge
The wheel and axle.

Note:
The screw is also a simple machine. But the door knob is not an example of a screw.
A door knob or door handle is used to open or close the door easily.
A wheel and axle is a simple machine in which the axle attaches the object to the wheel.