Physics
An electric iron of 750 W is used for S hours per day. Then the energy consumed in one day by the iron is:

600 units
6 units
60 units
0.6 units

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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
Mirage is due to:

Magnetic disturbances in the atmosphere
Unequal heating of different parts of the atmosphere
Equal heating of different parts of the atmosphere
Depletion of ozone layer in the atmosphere

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