Physics
When hot liquid is poured into a thick glass tumbler, it cracks because glass :

Has a very low specific heat
Has low temperature coefficient of expansion
Has high temperature coefficient of expansion
Is a bad conductor of heat so only inner surface expands

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Physics
The earth is a

Bad absorber and bad radiator of heat
Good absorber and good radiator of heat
Non-absorber of heat
Good reflector of heat

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Physics
Railway tracks are banked on curves so that

Necessary centripetal force may be obtained from the horizontal component of the weight of the train
The train may not fall down inwards
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

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