Physics
At hill stations, the boiling point of water will be

More than that at sea level
Equal to the melting point of ice
Less than that at sea level
Same as at sea level

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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
The train may not fall down inwards
Necessary centripetal force may be obtained from the horizontal component of the weight of the train

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