Solid state devices are electronic devices where the flow of electricity is through solid semiconductors. These electronic devices do not comprise any moving parts, where electronic action occurs in solid state.Their application is related to the field where it is utilised to interface with all human senses.
Question 1: ____________ is the amount of additional energy required to emit an electron from the metal surface.
a) Potential barrier
b) Potential junction
c) Work function
d) None of these
Answer: Work function
Explanation: The minimum amount of energy required to remove an electron to infinity from the metal surface is known as work function.
Question 2: The base of the transistor is _________ doped.
a) heavily b) lightly
c) both (a) and (b) d) none of these
Explanation: The base of the transistor is lightly doped as it carries the electrons from the emitter and passes it to the collector region.
Question 3: The two possible breakdown mechanisms in p-n junction diodes are ____________.
a) threshold and knee breakdown
b) avalanche and zener breakdown
c) avalanche and forward breakdown
d) reverse and forward breakdown
Answer: avalanche and zener breakdown
Explanation: The avalanche breakdown and zener breakdown are two different mechanisms by which the p-n junction diode breaks. They both occur under reversed biased conditions.
Question 4: If every atom in the silicon crystal is a silicon atom, then it is an ___________ semiconductor.
a) intrinsic b) extrinsic
c) both (a) and (b) d) none of these
Explanation: Intrinsic semiconductors are the purest form of semiconductors. The charge carrier contains an equal number of electron and holes with no impurities.
Question 5: _______________ is the creation of free electrons through the zener effect
a) Avalanche emission b) Thermionic emission
c) Low-field emission d) High-field emission
Answer: High-field emission
Explanation: In high-field emission inside the conductor, free electrons are pulled out of the metal surface. This effect is primarily caused by the zener effect.
Question 6: What is the maximum reverse voltage that can be applied before the current surges ?
a) Junction voltage b) Forward voltage
c) Reverse breakdown voltage d) Recovery voltage
Answer: Reverse breakdown voltage
Explanation: Reverse breakdown voltage is the maximum allowable value of reverse voltage that can be applied before the surge in current.
Question 7: At what temperature the semiconductor behaves like an insulator.
a) 100 K b) 0 K
c) 1 K d) 5 K
Answer: 0 K
Explanation: At a normal room temperature, a semiconductor contains sufficient free electrons to conduct current. But at absolute zero, free electrons in the valence band do not possess enough thermal energy to overcome the energy gap. It acts as an insulator at absolute zero temperature.
Question 8: When the number of free electrons is increased in the doped semiconductor, it transforms into ____________ semiconductor.
a) p type b) n type
c) np type d) pn type
Answer: n type
Explanation: In n type semiconductor, free electrons are the carri
Question 9: Which of the following impurities should be added to pure semiconductor to make a N-type semiconductor?
a) Aluminium b) Phosphorus
c) Indium d) None of these
Explanation: When pentavalent compound is added to pure semiconductor, N-type semiconductor is formed. Here, only phosphorus is pentavalent compound.
Question 10: ___________ and __________ are the parameters over which a diode characteristic is made.
a) Current, time b) Voltage, time
c) Current, frequency d) Voltage, current
Answer: Voltage, current
Explanation: Voltage versus current graph in which current is represented on Y-axis and voltage is denoted on X-axis.