Mastering semiconductors is crucial for success in the RRB JE Electronics exams. In this blog post, we've compiled 20 multiple-choice questions (MCQs) on semiconductors to enhance your exam preparation. Semiconductors are fundamental to modern electronics, serving as the backbone for devices like diodes, transistors, and integrated circuits. These MCQs cover key concepts such as semiconductor types, properties, and applications, helping you test your knowledge and identify areas for improvement. Each question includes an answer to facilitate instant learning. Whether you're revising or looking for fresh practice, these MCQs will build your confidence and ensure you're well-prepared for the exam. Start practicing now to boost your chances of success in the RRB JE exam!
Semiconductor kya hote hay ?
Semiconductor aise materials hote hain jinki electrical conductivity conductor aur insulator ke beech hoti hai. RRB JE Electronics examination me semiconductor se related questions basic definition, properties, temperature effect aur doping par regularly puche jate hain. Isliye ye topic Electronics Engineering ka foundation mana jata hai.
Semiconductor ki sabse important property ye hai ki iski conductivity temperature ke saath change hoti hai. Jaise-jaise temperature badhta hai, semiconductor me free charge carriers ki sankhya badh jati hai, jisse conductivity increase hoti hai aur resistance kam ho jata hai. Isi wajah se semiconductor ko negative temperature coefficient wala material kaha jata hai. Ye concept RRB JE exam me direct aur indirect dono tarah se pucha jata hai.
Sabse commonly used semiconductors Silicon (Si) aur Germanium (Ge) hain. In dono elements ke outermost shell me 4 valence electrons hote hain. Pure semiconductor ki electrical conductivity kam hoti hai, isliye practical electronic devices me use karne ke liye inme controlled amount me impurity milai jati hai. Is process ko doping kehte hain. Doping semiconductor ki conductivity ko kaafi had tak improve kar deti hai.
Doping ke aadhar par semiconductor ko do main types me divide kiya jata hai — N-type semiconductor aur P-type semiconductor.
N-type semiconductor me pentavalent impurities jaise phosphorus ya arsenic milai jati hain, jisse electrons majority charge carriers ban jate hain.
P-type semiconductor me trivalent impurities jaise boron ya aluminium use ki jati hain, jisme holes majority charge carriers hote hain.
RRB JE Electronics exam me N-type aur P-type semiconductor ke charge carriers aur impurity type par bahut baar questions puche gaye hain.
Semiconductor electronics ka base material hai. Isi se PN junction diode, Zener diode, transistor, rectifier aur integrated circuits (ICs) banaye jate hain. Agar semiconductor ka concept clear nahi hota, to diode aur transistor jaise topics automatically weak ho jate hain, jo RRB JE exam me scoring hote hain.
20 MCQs on Semiconductors for RRB JE Exam
1. What is a semiconductor?
a) A material that conducts electricity perfectly
b) A material with conductivity between conductors and insulators
c) A material that does not conduct electricity
d) None of the above
Answer: b) A material with conductivity between conductors and insulators
2. Which of the following is a common semiconductor material?
a) Copper
b) Silicon
c) Iron
d) Aluminum
Answer: b) Silicon
3. What is the primary charge carrier in n-type semiconductors?
a) Holes
b) Electrons
c) Protons
d) Neutrons
Answer: b) Electrons
4. In p-type semiconductors, which charge carriers are predominant?
a) Electrons
b) Holes
c) Ions
d) Photons
Answer: b) Holes
5. Which of the following is a characteristic of intrinsic semiconductors?
a) Doped with impurities
b) Pure and undoped
c) High conductivity
d) Contains free electrons
Answer: b) Pure and undoped
6. What effect does temperature have on semiconductor conductivity?
a) Conductivity decreases with temperature
b) Conductivity remains constant
c) Conductivity increases with temperature
d) Conductivity is independent of temperature
Answer: c) Conductivity increases with temperature
7. What type of semiconductor is created by adding impurities that have fewer valence electrons than the semiconductor material?
a) p-type
b) n-type
c) Intrinsic
d) Superconducting
Answer: a) p-type
8. Which of the following devices is made using semiconductors?
a) Capacitor
b) Resistor
c) Diode
d) Inductor
Answer: c) Diode
9. What is the band gap energy of silicon at room temperature?
a) 1.1 eV
b) 0.7 eV
c) 2.0 eV
d) 0.3 eV
Answer: a) 1.1 eV
10. Which semiconductor device is used for switching and amplification?
a) Resistor
b) Capacitor
c) Transistor
d) Inductor
Answer: c) Transistor
11. Which of the following is NOT a characteristic of semiconductors?
a) Temperature-dependent conductivity
b) Ability to be doped
c) High melting point
d) Metallic luster
Answer: d) Metallic luster
12. Which type of semiconductor has an excess of electrons?
a) p-type
b) n-type
c) Insulator
d) Conductor
Answer: b) n-type
13. What is the primary use of silicon in electronics?
a) Conductive wiring
b) Semiconductor devices
c) Thermal insulation
d) Magnetic shielding
Answer: b) Semiconductor devices
14. What happens to the resistance of a semiconductor as it is heated?
a) It increases
b) It decreases
c) It remains the same
d) It fluctuates
Answer: b) It decreases
15. Which of the following is an example of a p-n junction?
a) Resistor
b) Capacitor
c) Diode
d) Inductor
Answer: c) Diode
16. In semiconductor theory, what is a "hole"?
a) A free electron
b) A vacant position in the crystal lattice
c) A charged particle
d) None of the above
Answer: b) A vacant position in the crystal lattice
17. Which of the following materials is often used for doping silicon to create n-type semiconductors?
a) Boron
b) Phosphorus
c) Gallium
d) Arsenic
Answer: b) Phosphorus
18. What is the function of a diode?
a) Store energy
b) Amplify signals
c) Allow current to flow in one direction only
d) Increase voltage
Answer: c) Allow current to flow in one direction only
19. What is the primary application of photodiodes?
a) Power amplification
b) Light detection
c) Voltage regulation
d) Current limiting
Answer: b) Light detection
20. What occurs when a p-type and n-type semiconductor are joined together?
a) Insulation
b) Resistance increases
c) A p-n junction is formed
d) No change occurs
Answer: c) A p-n junction is formed
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