Physics
What is the reason for formation of Mirage in desert?

Refraction of light
Both Refraction and Total internal reflection of light
Total internal reflection of light
Reflection of light

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Physics
Isotopes of an element contain

the same number of protons but different number of neutrons
the same number of neutrons but different number of protons
equal number of protons and electrons
equal number of nucleons

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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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