Physics
Burns caused by steam are much severe than those caused by boiling water because

Steam has latent heat
Steam is gas and engulfs the body quickly
Steam pierces through the pores of body quickly
Temperature of steam is higher

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Physics
Planets do not twinkle because

Their distance from the earth does not change with time
They emit light of a constant intensity
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

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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 low melting point
Low resistance and high melting point

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