Physics
Thermocouple consists of

Two similar metals
Metal and an insulator
Metal and a semiconductor
Two dissimilar metals

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Physics
A cyclist leans inwards when he is negotiating a curve so that

Necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.
He may increase his speed
No frictional force may be produced between the wheels and the axle
His weight may be reduced

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