Physics
When a running car stops suddenly, the passengers tends to lean forward because of:

Inertia of rest
Inertia of motion
Gravitational force
Centrifugal force

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

The doped silicon piece will become n-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 p-type

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