Physics
Air moves from the region where the air ________

Humidity is high to the region where the humidity is low
Humidity is low to the region where the humidity is high
Pressure is high to the region where the pressure is low
Pressure is low to the region where the pressure is high

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Physics
Railway tracks are banked on curves so that

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

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