Question

The somethings which can change its shape and size and may appear and disappear anywhere/anytime is known as a

Answer 1

I think it must be gas as gas can take shape of anything

Answer 2

The something which can change its shape and size and may appear and disappear anywhere/anytime is known as a SHADOW.

The important characteristic of shadow is as follows,

1. Shadow is formed when the light does not reach behind the object.

2. There is no light enters the observer’s eyes.

3. It is not present in inverted form and does not provide any information about the object.

Shadow has two parts:

1. The darkest part of the shadow is called Umbra and it is a central part of the shadow.

2. The less dark part of the shadow is called Penumbra and it is an outer part of the shadow.