Physics
The quality or tone of a musical sound produced by a stringed instrument depends on

Frequency of vibration
Length of the strings in the instrument
Wave form of the sound
Amplitude of vibration

ANSWER DOWNLOAD EXAMIANS APP

Physics
Rainbow is due to

refraction and reflection of sunlight by water droplets
absorption of sunlight in minute water droplets
ionisation of water deposits
diffusion of sunlight through water droplets

ANSWER DOWNLOAD EXAMIANS APP

Physics
It is dangerous to observe Solar eclipse with naked eyes because

Cosmic rays reach eyes more during the eclipse
All radiations from sun initiate chemical reactions in eyes
Ultraviolet radiations from Sun burn our retina
Infrared radiations from sun burn our retina

ANSWER DOWNLOAD EXAMIANS APP

Physics
Why two thin shirts can keep us warmer than a single thick shirt in winter ?

No radiation of heat takes place
Two thin shirts become thicker so prevent transmission of heat
Air layer between two shirts behaves like insulating media
Air layer between two shirts works as good conductor

ANSWER DOWNLOAD EXAMIANS APP