The angle in between the reflected ray and the normal drawn from the point of incidence is called :

The human ear can hear sound of range :

The comfortable distance up to which the normal eye can read is :

A fruit appears to be bigger in a glass of water due to :

Which of the following is correct on the basic of their density?

Light ray which strikes the surface is called :

The vocal cords in men are about how many long?

Reflection from a rough surface is called :

The loudness of the sound depends upon :

The bouncing of light from a surface of a body is called :