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
4.
Two resistors each 5 Ω are connected in parallel. Determine their effective resistance.
2.5 Ω
6.4 Ω
10.0 Ω
25.0 Ω
5.
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
6.
Which of the following statements about resistors connected in parallel is correct? The total resistance is
the addition of the resistance.
less than any one of them.
equal to the greatest resistance.
greater than any one of them.
7.
An electrical component that is used to vary electric current is the
ammeter.
voltmeter.
rheostat.
amplifier.
8.
Transistors can be used as
I. amplifiers.
II. switches.
III. temperature controls.
Which of the statements above is/are true?
I only
II only
I and II only
II and III only
9.
The P-N junction diode has
equal number of holes and electrons
no holes
no electrons
more electrons than holes
10.
Semi-conductors are used in manufacturing
I. transistors.
II. diodes.
III. microphones.
I and II only
I and III only
II and III only
I, II and III
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