Physics
When a piece of pure silicon is doped with aluminium, then

The doped silicon piece will become p-type
The conductivity of the doped silicon piece will remain the same
The resistivity of the doped silicon piece will increase
The doped silicon piece will become n-type

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Physics
Rain drops fall from great height. Which among the following statements is true regarding it?

They fall with same ultimate velocity
Their velocity increases and they fall with different velocity on the earth
Their velocity increases and they fall with same velocity on the earth
They fall with that ultimate velocity, which are different for different droplets

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