Question

Which of the following is an example of muscular force?
A. Two magnets attracting each other.
B. An apple falling from a tree.
C. Charges produced by friction.
D. None of these.

Answer 1

First understand the definition of muscular force with the help of an example, which will help to understand how this force is applied and in what situations it is applied. Once the concept is clear, then check all the options and try to understand what type of force is shown in that option. If the type of forces shown in the options does not match muscular force, then the correct answer is clear but if it matches, then that option is the correct answer.

Complete solution:
Force applied by the action of muscles of our body from body parts like arms and legs, is known as muscular force. It is a type of contact force and whenever something is touched and muscular power is applied on it, then this force comes into action. Every movement of the body is a result of muscular force.

Walking, running, jumping, lifting a weight, etc. all are examples of muscular force and there are many more activities which are done by applying power of muscles that all will be examples of muscular force.

So, now when we check the options then we get to know that: -
Two magnets attracting each other is an example of magnetic force not muscular force.
An apple falling from a tree is an example of gravitational force not muscular force, and
Charges produced by friction is an example of frictional force not muscular force.
Since, none of the options mentioned is an example of muscular force.

Therefore, the correct answer is Option (D).

Note:
There are different types of forces in physics, like magnetic force, gravitational force, frictional force, muscular force, etc. and each force has different features from one other. So, to get the answer for this question, first understand the different types of forces, whose examples are mentioned in the option, then it will become easier to understand which option is an example of muscular force.