Physics
Fog is an example of

Liquid dispersed in gas
Solid dispersed in gas
Gas dispersed in gas
Solid dispersed in liquid

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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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Physics
A Fuse wire is characterised by

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

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