Here, I will display some Multiple-Choice Questions or Objective Type Questions on Semi-Conductor Diode. You will get a clear picture of this topic. It will help you in different competitive examinations.
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MCQ on Semi-Conductor Diode
Here is an MCQ-based test on “semi-conductor diode”.
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Short questions on semi-conductor diode
What is Diode?
A diode is an electronics device. It fixes the path of the flow of the current in one direction.
Being a polarised component, it has two leads. One end is the cathode and the other end is the anode.
For distinguishing the cathode and anode visually, the cathode is silver-colored.
What is p-type semi conductor and n-type semiconductor? Explain.
If we want to increase the conductivity of pure semiconductors, we need to mix some impurities within it.
These impurities are:
The materials that have 3 numbers of electrons in their outer shell of the atoms are trivalent impurities.
Example: Boron(B), aluminium (Al), Galium (Ga), Indiam(In), etc.
By adding trivalent impurities, the number of holes increases.
Therefore, at the outermost shell number of holes is more than that of neutrons. Thus, we get p-type semi-conductors.
The materials that have 5 numbers of electrons in the outer shell of the atoms are pentavalent impurities.
Thus, we need this type of impurities for making n-type semiconductors.
Examples: phosphorus (P), Arsenic (As), Antimony (Sb), etc.
What is Doping?
The mixing of impurities within the semi-conductors is doping.
We can control the movement of electric current by controlling the doping.
In p-type semiconductors, the majority carriers of charge are holes and minority carriers are electrons.
In n-type semiconductors, the majority carriers of charge are electrons and minority carriers are holes.
What are the properties of semi conductors?
At absolute zero temperature, semi-conductors behave like perfect insulators.
At room temperature, electron density within them is lower than that of the metal. Therefore, the conductivity of the semiconductor is less than that of the metal.
How will you come to know whether the material is p-type or n-type?
In n-type materials, the majority of careers of charges are electrons. Hence if the material has much more electrons in the outermost shell, the material is of n-type material.
If the material has very low numbers of electrons in the outermost shell, the material is of p-type material.
What are the uses of semi-conductors?
We use semi-conductors mostly in electronic devices such as television, laptop, mobile phone, diode, integrated circuits, transistors, etc.
What is p-n junction diode?
p-n junction diode is the simplest form of the diode.
When an n-type material gets connected with a p-type material, it forms a p-n junction diode.
What is Forward bias connection?
Bias means the application of the voltage. Setting the current and the voltage of an active device in an amplifier is the biasing. When electrons flow in the forward direction, it is forward biasing.
When the positive voltage is linked with the p-side of the junction and the negative voltage is linked with the n-side of the junction; the electrons move forward. It s the real connection.
Thus the current flows in the forward direction. This is the forward biased connection.
What is Reversed bias connection?
For making a reversed bias connection, you should connect the positive voltage with the n-side of the diode and the negative voltage with the p-side of the diode.
Does current flow in reversed biased connection?
No. In the reversed bias connection, current does not flow.
The multiple-choice questions that are mentioned here are the basic questions from the “semi-conductor diode”. This will help you in clearing the viva during the semester examination and also in different competitive examinations. Thank you. Best wishes.