Physics
The alluminating powers of two sources are compared by

A photometer
A fluxmeter
A spectrometer
A polarimeter

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Physics
Planets are

non-luminous heavenly bodies
luminous heavenly bodies revolving around a star
luminous heavenly bodies that twinkle
luminous heavenly bodies that do not twinkle

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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 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 of the weight of the train
The train may not fall down inwards

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