Physics
What principle/law explains the working of the hydraulic brakes in automobiles ?

Posieulle's principle
Pascal's law
Archimedes' principle
Bernoulli's law

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

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