Physics
A small gap is left at the joints of rails in a railway track to

Keep the rails equidistant
Control the speed of train
Avoid the heating of tracks to high temperature
Avoid the tracks being distorted due to seasonal temperature variation

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Physics
It takes much longer to cook food in the hills than in the plains, because

due to low atmospheric pressure on the hills, the water boils at a temperature higher than 100oC and therefore water takes longer to boil
n the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than 100oC causing an increase in cooking time
in the hills the humidity is high and therefore a lot of heat is absorbed by the atmosphere leaving very little heat for cooking
in the hills the atmospheric density is low and therefore a lot of heat is lost to the atmosphere

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Physics
A Fuse wire is characterised by

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

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