Physics
Water is used in car radiator because of its

Low density
Easy availability
Low boiling point
High specific heat capacity

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Physics
Rainbow is due to

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

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Physics
In the process of magnetisation of a bar

Only the surface of the bar gets magnetised
Only the ends of the bar get magnetised
The entire bulk of the bar gets magnetised
Only some parts of the outer layers of the bar get magnetised

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