Physics
Solar eclipse will take place when

the moon does not lie on the line joining the sun and the earth
the moon is between the sun and the earth
the earth is between the moon and the sun
the sun is between the moon and the earth

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

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Physics
Conservation of energy refers to the fact that

No chemical reaction is 100 percent efficient
Energy cannot be created or destroyed but can be converted from one form to another
If you conserve energy you will not be as tired
The entropy of the universe is always increasing

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