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Rajasthan Board Class 12 (RBSE) Semiconductors — practice questions

Explore 29 free Semiconductors questions in Rajasthan Board Class 12 (RBSE) Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Semiconductors questions and exercises with answers

Showing questions 1–29 of 29.

A p-n junction diode is forward biased when:Read the answer and worked solution →The output of an AND gate is HIGH only when:Read the answer and worked solution →At absolute zero ($T = 0\,\text{K}$), a pure intrinsic semiconductor behaves like a(n)Read the answer and worked solution →The barrier (built-in) potential of an unbiased silicon p-n junction at room temperature is approximatelyRead the answer and worked solution →Metal, semiconductor, or insulator?Read the answer and worked solution →Complete what decides the class of a materialRead the answer and worked solution →True or false: intrinsic semiconductorsRead the answer and worked solution →Tap every semiconductor the chapter namesRead the answer and worked solution →Elemental or compound semiconductor?Read the answer and worked solution →Semiconductors in devicesRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Flip and pair: material with its classRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Order the reasoning: why a pure semiconductor conductsRead the answer and worked solution →True or false: classifying materialsRead the answer and worked solution →Resistivity rangesRead the answer and worked solution →True or false: carriers in a semiconductorRead the answer and worked solution →Device or material?Read the answer and worked solution →Tap every factor deciding a material's classRead the answer and worked solution →Assertion and reason: semiconductorsRead the answer and worked solution →Flip and pair: term with meaningRead the answer and worked solution →Two true, one falseRead the answer and worked solution →Spot the odd one outRead the answer and worked solution →Complete the resistivity comparisonRead the answer and worked solution →True or false: devicesRead the answer and worked solution →Pure and impureRead the answer and worked solution →Order the classification of a materialRead the answer and worked solution →

Worked practice questions

A p-n junction diode is forward biased when:

  1. The p-side is at higher potential than the n-side of the chip
  2. The n-side is at higher potential than the p-side strongly
  3. Both p and n are kept at the same potential always here
  4. No external voltage is applied to the diode at any point
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Correct answer: A. The p-side is at higher potential than the n-side of the chip

Forward bias: p-side connected to the positive terminal (higher potential than n-side); current flows.

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The output of an AND gate is HIGH only when:

  1. Either of the two inputs is HIGH on the chip, by definition
  2. Both inputs are LOW on the chip, regardless of any other state
  3. Exactly one input is HIGH at a time, never both together
  4. Both inputs are HIGH at the same time on the silicon
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Correct answer: D. Both inputs are HIGH at the same time on the silicon

AND gate: output = 1 only if all inputs = 1.

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At absolute zero ($T = 0\,\text{K}$), a pure intrinsic semiconductor behaves like a(n)

  1. perfect metal
  2. superconductor
  3. insulator
  4. p-type semiconductor
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Correct answer: C. insulator

1. In a pure (intrinsic) semiconductor, at $T = 0\,\text{K}$ all valence electrons are in the valence band and the conduction band is COMPLETELY EMPTY. 2. With NO carriers available, the semiconductor cannot conduct — it behaves like an INSULATOR. 3. Conduction in intrinsic semiconductors at non-zero $T$ relies on thermal excitation across the small band gap. At $T = 0$ this excitation is impossible. 4. Option A and B require carriers (or paired states) which don't exist at $T = 0$. Option D would require a deliberate trivalent dopant — but the sample is INTRINSIC (pure). _Source: syllabus Physics Part 2, Ch 14, §14.3 (Intrinsic Semiconductor — temperature dependence), p. 4–5._

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