Question

Sound is produced by a
(A) Vibrating body
(B) Moving body
(C) Oscillating body
(D) Both A and C

Answer 1

Hint: To solve this problem, the first try will be to understand what sound is. Then after that try to determine how sound can be produced or what causes sound. After that explain how these sound waves propagate in the air. After studying these factors by comparing them to the four options given in the question, we can determine the answer.

Complete answer:
From the vibration of any object, sound can be produced. It is a form of energy.
Anytime we hear the sound, it is a result of some object vibrating. When an object begins to vibrate to and fro in the air space, the molecules surrounding the objects also begin to vibrate back and forth with the same frequency. These vibrations are then passed over to the next layer of air molecules, as a result of which they also begin to vibrate back and forth. Therefore, when an object vibrates in the air, the air around it also vibrates and carries the sound to our ears.
A. This is the correct option as sound is produced by a vibrating object.
B. Sound can also be produced by a moving object. Therefore this is also a correct option.
C. This is also a correct option as it can be produced by an oscillating body.
D. Both A and C – this is not the right answer because the above three options are right for both of those two.
Therefore from the above discussion, we can conclude that sound can be produced by vibrating, moving, and oscillating objects.
So, the correct options are: (A),(B), and, (C).

Note:
Sound is an acoustic wave. This energy can travel through mediums such as solid, liquid, or gas. Sounds are usually longitudinal waves but in solids, they can behave as transverse waves too. The propagation of sound in a medium can depend on factors such as pressure, temperature, and even on a medium that is in propagation.