Physics
A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole ?

Remain constant
Will increase first and then dcrease
Dacrease
Increase

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

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

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Physics
Super conductors are substances that

Conduct electricity at high temperature
Conduct electricity at low temperature
Offer high resistance to the flow of electric current
Offer minimum resistance to flow of electric current

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