Physics
Which physical quantity is measured in 'siemens'?

Magnetic flux
Electric potential
Electrical conductance
Refractive index

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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.
No frictional force may be produced between the wheels and the axle
He may increase his speed
His weight may be reduced

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Physics
The earth is a

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

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