Physics
Planets do not twinkle because

They are nearer to earth and hence we receive a greater amount of light.
They are very far away from the earth resulting in decrease in intensity of light
Their distance from the earth does not change with time
They emit light of a constant intensity

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Physics
In the process of magnetisation of a bar

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

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