Physics
If an object moves with constant velocity,

It must have constant speed in constant direction
None of these
It must have constant speed
It must have constant direction

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Physics
Railway tracks are banked on curves

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 weight of the train
the train may not fly off in the opposite direction
to avoid frictional force between the tracks and wheels

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Physics
A Fuse wire is characterised by

High resistance and high melting point
Low resistance and high melting point
Low resistance and low melting point
High resistance and low melting point

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