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Answer:
It is to increase friction .
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Answer: Sand is dusted on railway tracks in rainy season to increase friction
Explanation: In rainy season the railway tracks become slippery and very smooth but as trains have to use the tracks for transportation there need to be some good amount of friction to help them move . In rainy season the friction is very less thus in order to increase the friction sand is dusted on the railway tracks .
Therefore option B is the correct answer
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