Physics
When a stone is thrown in the calm water of a pond the waves produced on the surface of water in the pond are

Transverse
Waves are not produced
Longitudinal
Both longitudinal and transverse

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

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
The doped silicon piece will become p-type

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