Railway tracks are laid on large sized wooden, iron or cement sleepers. Why?

Why railway tracks are laid on large sized wooden sleepers ?

Give reasons for the following statements: (a) Railway tracks are laid on large sized wooden sleepers. (b) It is difficult to walk on and. (c) Walking bare footed on a pebbled path is painful.

Assertion : Railways tracks are laid on small sized wooden sleepers. Reason : Small sized wooden sleepers are used so that rails exert more pressure on the railway track. Due to which rail does not leave the track

These questions consist two statements each, printed as Assertion and reason, while answering these question you are required to choose any one of the following four responsis: (a) If both the assertion and reason are true and reason is a true explanation of the assertion. (b) If both the assertion and reason are true but the reason is not the correct explanation of assertion. (c ) If the assertion is true but reason is false. (d) If both the assertion and reason are false. Q. Assertion: Railway tracks are laid on small-sized wooden sleepers. Reason: Small sized wooden sleepers are used so that rails exert more pressure on the railway track. due to which rail does not leave the track.

Railway tracks are laid with gaps for expansion. The gap between the steel rails 20 m long is 1.2 cm at 10^@C . The temperature at which the steel rails just touch each other is ( prop steel = 12 xx 10^-6//^@C)

Why is a railway track not a continuous piece but is made up of segments separated by the gaps?

A railway track (made of iron) is laid in winter when the average temperature is 18^(@)C . The track consists of sections of 12.2 m placed one after the other. How much gap should be left between two such sections so that there in no compression during summer when the maximum temperature goes to 48^(@)C ? Coefficient of linear expansion of iron = 11 xx 10^(-5) @C(-1) .

A railway track (made of iron) is laid in winter when the average temperature is 18^(@)C . The track consists of sections of 12 m placed one after the other. How much gap should be left between two such sections so that there in no compression during summer when the maximum temperature goes to 48^(@)C ? Coefficient of linear expansion of iron = 11 xx 10^(-5)C^(-1) .