Physics
Rainbow is due to

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

ANSWER DOWNLOAD EXAMIANS APP

Physics
A cyclist leans inwards when he is negotiating a curve so that

He may increase his speed
No frictional force may be produced between the wheels and the axle
Necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.
His weight may be reduced

ANSWER DOWNLOAD EXAMIANS APP