Physics
In very cold countries alcohol is used as a thermometric liquid because

Alcohol can be coloured for its level to be seen easily
It will not stick to the glass tube
Alcohol is a poor conductor of heat
Its freezing point is very low

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Physics
Railway tracks are banked on curves so that

No frictional force may be produced between the tracks and the wheels of the train
Necessary centrifugal force may be obtained from the horizontal component of the weight of the train
Necessary centripetal force may be obtained from the horizontal component of the weight of the train
The train may not fall down inwards

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