Semiconductor Electronics Practice Questions
JEE · Physics · 1488 free MCQs with instant results and detailed explanations.
1488
Total
322
Easy
679
Medium
487
Hard
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Topics in Semiconductor Electronics
Semiconductor Basics
201
p-n Junction Diode
200
Zener Diode
168
Transistor
183
Logic Gates
188
Photodiode
187
Solar Cell
172
LED
189
Sample Questions from Semiconductor Electronics
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What is the primary difference between intrinsic and extrinsic semiconductors?
A.
Intrinsic semiconductors are pure materials, while extrinsic semiconductors contain dopants.
B.
Intrinsic semiconductors have high conductivity, while extrinsic do not.
C.
Intrinsic semiconductors can only be found at room temperature, whereas extrinsic can be found at any temperature.
D.
Intrinsic semiconductors are metals, while extrinsic are non-metals.
Show Answer & Explanation
Correct Answer: A
Intrinsic semiconductors are made of pure material without any impurities, while extrinsic semiconductors are those that have been doped with specific impurities to modify their electrical properties.
Q2
Easy
Which of the following statements about the conduction band and valence band in semiconductors is true?
A.
The conduction band is always empty at absolute zero temperature.
B.
Electrons can jump from the valence band to the conduction band when energy is supplied.
C.
The valence band is located above the conduction band.
D.
Both bands are fully occupied at all temperatures.
Show Answer & Explanation
Correct Answer: B
Electrons can occupy the valence band and, when energy is supplied, can jump to the conduction band where they can contribute to electrical conduction.
Q3
Easy
If the energy band gap of a semiconductor is 1.1 eV, which of the following types of light can it absorb?
A.
Infrared light (longer wavelength than visible)
B.
Ultraviolet light (shorter wavelength than visible)
C.
Visible light with any wavelength
D.
Radio waves (longer wavelength than infrared)
Show Answer & Explanation
Correct Answer: B
A semiconductor with an energy band gap of 1.1 eV can absorb light with energy greater than or equal to that band gap, which corresponds to ultraviolet light.
Q4
Medium
What type of charge carriers are found in p-type semiconductors?
A.
Electrons
B.
Holes
C.
Both electrons and holes
D.
Neither electrons nor holes
Show Answer & Explanation
Correct Answer: B
In p-type semiconductors, holes, which are the absence of electrons, act as the majority charge carriers.
Q5
Medium
Which of the following is a common method used to produce intrinsic semiconductors?
A.
Doping with group V elements
B.
Cooling to very low temperatures
C.
Thermal agitation at high temperatures
D.
Irradiation with gamma rays
Show Answer & Explanation
Correct Answer: C
Intrinsic semiconductors are produced by heating pure materials, allowing thermal energy to create electron-hole pairs.
Q6
Medium
In a diode, when is it considered to be in a forward bias condition?
A.
When the p-side is connected to the battery's positive terminal
B.
When the n-side is connected to the battery's negative terminal
C.
When the current flows from n to p
D.
When both terminals are at the same potential
Show Answer & Explanation
Correct Answer: A
In forward bias, the p-side is connected to the positive terminal, allowing current to flow easily through the diode.
Q7
Medium
What is the effect of temperature on the conductivity of intrinsic semiconductors?
A.
Conductivity increases with temperature
B.
Conductivity decreases with temperature
C.
Conductivity remains constant with temperature
D.
Conductivity shows no relation with temperature
Show Answer & Explanation
Correct Answer: A
As temperature increases, more electrons gain energy, resulting in increased conductivity in intrinsic semiconductors.
Q8
Hard
What is the intrinsic carrier concentration of a semiconductor at absolute zero temperature?
A.
Zero
B.
A finite positive value
C.
Infinity
D.
Depends on the material
Show Answer & Explanation
Correct Answer: A
At absolute zero, all carriers are in the ground state, leading to zero intrinsic carriers.
Q9
Hard
In a p-n junction, which of the following statements regarding the depletion region is true?
A.
It contains free electrons and holes.
B.
It has a constant width.
C.
It is formed due to the diffusion of holes and electrons.
D.
It is neutral overall.
Show Answer & Explanation
Correct Answer: C
The depletion region is formed due to the diffusion of charge carriers, leading to an electric field.
Q10
Hard
What is the effect of increasing temperature on the conductivity of intrinsic semiconductors?
A.
It decreases.
B.
It remains constant.
C.
It increases.
D.
It becomes zero.
Show Answer & Explanation
Correct Answer: C
Increasing temperature gives more energy to electrons, leading to increased conductivity in intrinsic semiconductors.
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Semiconductor Electronics — JEE Physics Practice Questions Online
This page contains 1488 practice MCQs for the chapter Semiconductor Electronics in JEE Physics. The questions are organized by difficulty — 322 easy, 679 medium, 487 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 8 topics, giving you comprehensive coverage of the entire chapter.