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Indian Navy Pilot Semiconductor Devices — practice questions

Explore 5 free Semiconductor Devices questions in Indian Navy Pilot Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Semiconductor Devices questions and exercises with answers

Showing questions 1–5 of 5.

In an intrinsic (pure) semiconductor at T > 0:Read the answer and worked solution →Solar cell converts:Read the answer and worked solution →For NPN transistor in active mode, base-emitter junction is ___ and base-collector is ___:Read the answer and worked solution →n-type or p-type?Read the answer and worked solution →True or false: semiconductorsRead the answer and worked solution →

Worked practice questions

In an intrinsic (pure) semiconductor at T > 0:

  1. Only electrons
  2. No charge carriers
  3. Only holes
  4. Equal number of electrons (in CB) and holes (in VB)
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Correct answer: D. Equal number of electrons (in CB) and holes (in VB)

Thermal excitation promotes electrons from valence band to conduction band, leaving holes. n_e = n_h = n_i (intrinsic carrier concentration). Both contribute to conductivity.

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Solar cell converts:

  1. Mechanical
  2. Chemical
  3. Light to ELECTRICAL energy via photovoltaic effect
  4. Heat to electric
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Correct answer: C. Light to ELECTRICAL energy via photovoltaic effect

**Solar cell:** large-area p-n junction with anti-reflective coating. Photon energy > E_g creates carriers built-in field separates them, producing voltage ~0.5 V per cell. **Efficiency:** ~15–25% typical Si up to 40%+ for advanced multi-junction designs.

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For NPN transistor in active mode, base-emitter junction is ___ and base-collector is ___:

  1. Both off
  2. Both forward
  3. Both reverse
  4. Forward and reverse — BE forward, BC reverse (active region)
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Correct answer: D. Forward and reverse — BE forward, BC reverse (active region)

**Active mode:** BE forward bias (inject electrons into base), BC reverse bias (collect electrons that diffuse across thin base region). Both forward = saturation; both reverse = cutoff.

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