MCQs on Analog Electronics

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01․ The resistance of pn junction when it is forward biased in the order of
Mega Ohm
Kilo Ohm
None of the above

When the pn junction is forward biased the resistance would be in the order of Ohm. Because in forward biased condition the depletion layer is very small and breaks with small applied voltage.

02․ Electron mobility is defined as
Diffusion velocity per unit field
the movement of electrons
Drift velocity per unit field
None of the above


03․ Which of the following does not obey the Ohm's law?
Bilateral device
None of the above

Semiconductors are non-linear device so it does no obey the ohm's law. The properties of a semiconductor changes with the change in direction of voltage and current.

04․ The room temperature resistivity of pure silicon is

05․ Acceptor type impurities
Create excess holes
have three valance electrons
are used to make P-type semiconductor
all of the above

Acceptor impurities are also called trivalent impurity. Acceptor impurity accept the electrons and make P-type semiconductor material.

06․ Semiconductor material is

Semiconductor Materials have 4 electrons in outer most shell or in valance shell so it is called tetravalent.

07․ For Germanium pn junction, the maximum value of barrier potential is

When the pn junction is made a layer is formed between between P and N material which restrict the flow of current at a particular voltage level this layer breaks. The voltage required to break this layer is called barrier potential. The maximum value of barrier potential is .3V.

08․ When pn junction is reverse biased
the witdh of depletion layer increases
a small current flows through it because of minority carriers
it offers a very high resistance
all of the above

When pn junction is reversed biased it does not conduct any current as it offers very high resistance. The width of the depletion layer increases but a small amount of leakage current flows due to the thermally generated minority carriers.

09․ Semiconductor Diode is used as
an amplifier
a modulator
a rectifier
an oscillator

Diode conduct only in one direction when its anode voltage is greater than the cathode voltage. It is used to convert AC to DC. So semiconductor diode used as a rectifier.

10․ A semiconductor diode is
a processing device
non-linear device
linear device
bilateral device

In semiconductor devices when voltage increases or decreases the current does not increases or decreases proportionately. So, semiconductor device does not obeys ohm's law. That is why semiconductor device is a non-linear device.