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Semiconductor Electronics Materials Devices and Simple Circuits — NEET & JEE Physics MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

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Sample questions from this chapter

Which pair consists of elemental semiconductors commonly used in electronic devices?
  1. Silicon and germanium ✓
  2. Copper and aluminium
  3. Diamond and graphite
  4. Sodium chloride and mica
Answer: A. Silicon and germanium are group-IV elemental semiconductors whose conductivity can be controlled through temperature and doping.
Why not B: Copper and aluminium are metallic conductors with abundant mobile electrons rather than elemental semiconductors.
Why not C: These are carbon allotropes; diamond is insulating and graphite conducts by a different band structure.
Why not D: Sodium chloride and mica are ordinarily classified as insulators, not elemental semiconductor materials.
Carbon, silicon, and germanium have energy gaps Eg(C), Eg(Si), and Eg(Ge). Which order is correct?
  1. Eg(Ge) > Eg(Si) > Eg(C)
  2. Eg(Si) > Eg(C) > Eg(Ge)
  3. Eg(C) > Eg(Si) > Eg(Ge) ✓
  4. Eg(C) = Eg(Si) = Eg(Ge)
Answer: C. The approximate gaps are 5.4 eV for diamond, 1.1 eV for silicon, and 0.7 eV for germanium, giving the stated descending order.
Why not A: Germanium has the smallest of the three gaps, so placing it first reverses the observed trend.
Why not B: Carbon's approximately 5.4 eV gap is much larger than silicon's approximately 1.1 eV gap.
Why not D: A common valency does not force equal gaps because lattice spacing and bonding energies differ.
Pure silicon has 5.0 × 10^28 atoms m^-3 and is doped with 1 ppm pentavalent impurity. If ni = 1.5 × 10^16 m^-3 and donors are ionised, what is the approximate hole concentration?
  1. 4.5 × 10^9 m^-3 ✓
  2. 1.5 × 10^16 m^-3
  3. 5.0 × 10^22 m^-3
  4. 2.5 × 10^31 m^-3
Answer: A. One ppm gives ne ≈ 5.0 × 10^22 m^-3. From ne nh = ni², nh = 2.25 × 10^32/(5.0 × 10^22) = 4.5 × 10^9 m^-3.
Why not B: This repeats the intrinsic concentration even though donor doping greatly raises electron concentration and lowers holes.
Why not C: This is approximately the donor-supplied electron concentration, which is the majority rather than minority population.
Why not D: This resembles multiplying large concentrations and has neither the mass-action quotient nor a plausible carrier density.

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Questions

How many NEET and JEE questions are there on Semiconductor Electronics Materials Devices and Simple Circuits?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 12 chapter.

Is this NEET and JEE Physics chapter test free?

Yes. Every chapter test is free with no login, and you get your all-India rank on every one. Nothing on the site is on sale right now.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.