Physics
A disk and a sphere of same radius but different masses roll on two inclined planes of the same altitude and length. Which one of the two objects gets to the bottom of the plane first ?

Depends on their masses
Sphere
Both reach at the same time
Disk

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Physics
Rainbow is due to

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

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