Physics
The boiling point of water decreases at higher altitudes is due to

High temprature
Low temperature
Low atmospheric pressure
High atmospheric pressure

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

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
The conductivity of the doped silicon piece will remain the same

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