Physics
A NOT gate can be implemented by:

A single resistor
A single transistor
Two diodes
A single diode

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

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Physics
A Fuse wire is characterised by

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

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