Physics
As we go from Equator to North pole the value of ''g', the acceleration due to gravity

Remains the same
None of these
Increases
Decreases

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Physics
Railway tracks are banked on curves

the train may not fly off in the opposite direction
to avoid frictional force between the tracks and wheels
necessary centrifugal force may be obtained from the horizontal component weight of the train
necessary centripetal force may be obtained from the horizontal component of the weight of the train

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Physics
A hydrogen balloon floats up because of

Air pressure decreases with decrease in height
Weight of the balloon is less than the weight of air displaced by it.
The pressure inside the balloon is more than the pressure outside it
Air pressure decreases with decrease in weight

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