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1.
Which of the following statements are correct about semiconductors? They
I. are used to make transistors.
II. do not obey Ohm's law.
III. are group (IV) elements.
I, II and III
I and III only
I and II only
II and III only
2.
In a step-down transformer,
there are more turns in the secondary coil than in the primary.
the current in the primary coil is more than the current in the secondary coil.
the voltage of the secondary coil is higher than that of the primary.
there are more turns in the primary coil than in the secondary.
3.
Addition of an atom of a pentavalent element to a tetravalent element
I. is known as doping.
II. forms an n-type semiconductor.
III. forms a p-type semiconductor.
I and II only
I and III only
II and III only
I, II and III
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