What is the primary difference between intrinsic and extrinsic semiconductors?
a) Intrinsic semiconductors have no impurities, while extrinsic semiconductors are doped with impurities
b) Extrinsic semiconductors have no impurities, while intrinsic semiconductors are doped with impurities
c) Intrinsic semiconductors conduct better than extrinsic semiconductors
d) There is no difference between intrinsic and extrinsic semiconductors
Which of the following is an example of an intrinsic semiconductor?
a) Silicon
b) Phosphorus-doped silicon
c) Gallium arsenide
d) Aluminum-doped germanium
What is the main purpose of doping a semiconductor?
a) To make the semiconductor more expensive
b) To increase the number of charge carriers
c) To reduce the conductivity of the material
d) To change the color of the material
What type of impurity is added to create an n-type extrinsic semiconductor?
a) Group III elements
b) Group IV elements
c) Group V elements
d) Group II elements
Which of the following elements is commonly used to dope silicon to create an n-type semiconductor?
a) Boron
b) Gallium
c) Phosphorus
d) Aluminum
What is the primary charge carrier in an n-type semiconductor?
a) Holes
b) Electrons
c) Protons
d) Neutrons
What type of impurity is added to create a p-type extrinsic semiconductor?
a) Group III elements
b) Group IV elements
c) Group V elements
d) Group II elements
Which of the following elements is commonly used to dope silicon to create a p-type semiconductor?
a) Phosphorus
b) Gallium
c) Arsenic
d) Nitrogen
What is the primary charge carrier in a p-type semiconductor?
a) Electrons
b) Holes
c) Protons
d) Neutrons
Which of the following statements is true about intrinsic semiconductors?
a) They have a high number of free charge carriers
b) They are usually doped with impurities to enhance conductivity
c) They have equal numbers of electrons and holes at absolute zero temperature
d) They are more conductive than extrinsic semiconductors
In an n-type semiconductor, the majority charge carriers are:
a) Holes
b) Electrons
c) Protons
d) Neutrons
In a p-type semiconductor, the majority charge carriers are:
a) Electrons
b) Holes
c) Protons
d) Neutrons
What is the main role of an intrinsic semiconductor in a diode?
a) To amplify the current
b) To provide a pure semiconductor material with balanced charge carriers
c) To regulate the current flow
d) To act as an insulator
What happens when a small amount of impurity is added to an intrinsic semiconductor?
a) It becomes an insulator
b) It becomes an extrinsic semiconductor
c) It becomes a conductor
d) It becomes a superconductor
What is the conductivity type of a semiconductor created by doping with phosphorus?
a) p-type
b) n-type
c) Both p-type and n-type
d) Neither p-type nor n-type
What is the conductivity type of a semiconductor created by doping with boron?
a) p-type
b) n-type
c) Both p-type and n-type
d) Neither p-type nor n-type
Which of the following materials is commonly used as an intrinsic semiconductor?
a) Phosphorus
b) Silicon
c) Gallium arsenide
d) Aluminum
Which of the following describes an extrinsic semiconductor?
a) A semiconductor made of pure material with no impurities
b) A semiconductor that conducts due to the presence of impurities
c) A semiconductor that cannot conduct electricity
d) A material that only conducts at very high temperatures
What happens to the conductivity of a semiconductor when it is doped with an element from Group III of the periodic table?
a) It becomes n-type
b) It becomes p-type
c) It becomes an insulator
d) It becomes a metal
Which of the following is an example of an extrinsic semiconductor?
a) Pure silicon
b) Silicon doped with phosphorus
c) Germanium without impurities
d) Silicon with no doping
What is the main purpose of creating a p-n junction in semiconductors?
a) To increase the resistivity of the material
b) To create a device with rectification properties
c) To improve the energy storage capacity
d) To convert electrical energy into light
Which of the following best describes an intrinsic semiconductor?
a) It has a high concentration of charge carriers
b) It is doped with impurities to increase conductivity
c) It is made of pure semiconductor material with no added impurities
d) It conducts only at very high temperatures
What is the role of electrons in a semiconductor material?
a) They carry the charge in an n-type material
b) They act as the majority charge carriers in p-type materials
c) They are fixed and do not move in any type of semiconductor
d) They block current flow in the semiconductor
What happens when an intrinsic semiconductor is exposed to heat or light?
a) It becomes an extrinsic semiconductor
b) The number of free charge carriers increases
c) It becomes a metal
d) Its conductivity decreases
Which of the following elements is commonly used for doping intrinsic semiconductors to create p-type materials?
a) Phosphorus
b) Boron
c) Arsenic
d) Silicon
Which type of semiconductor has a higher number of free electrons?
a) P-type semiconductor
b) N-type semiconductor
c) Both P-type and N-type semiconductors
d) Neither P-type nor N-type semiconductor
How does doping affect the electrical properties of a semiconductor?
a) It decreases the number of free charge carriers
b) It increases the number of free charge carriers
c) It makes the material an insulator
d) It makes the material a superconductor
Which of the following is NOT a characteristic of an extrinsic semiconductor?
a) It has a controlled number of charge carriers
b) It has a fixed energy band gap
c) It is doped with impurities to change its electrical properties
d) It is always a pure semiconductor material
