Physics
Planets do not twinkle because

They emit light of a constant intensity
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 are nearer to earth and hence we receive a greater amount of light.

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Physics
A Fuse wire is characterised by

High resistance and low melting point
High resistance and high melting point
Low resistance and high melting point
Low resistance and low melting point

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