Physics
Solids which conduct electricity at higher temperature but not at lower temperature are called

Semi-conductor
Metallic-conductor
Super-conductor
Insulator

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Physics
We always see the same face of the moon, because

It is smaller than the earth
It rotates at the same speed as the earth around the sun
It takes equal time for revolution around the earth and rotation on its own axis
It revolves on its axis in adirection opposite to that ofthe earth

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