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Intrinsic and Extrinsic Semiconductors for GUJCET: 13 solved questions

Real GUJCET paper questions on intrinsic and extrinsic semiconductors, part of semiconductor electronics. Each opens with the options, the correct answer and a step-by-step solution. Papers run from 2007 to 2026. No sign-in needed to read them.

What this topic asks

• Doping and carrier concentration — 12 questions
• Conductivity and mobility — 1 question

All 13 questions with solutions

• N-type semiconductor is obtained on doping intrinsic germanium by GUJCET 2007
• A hole in a p-type semiconductor is in a covalent bond. GUJCET 2007
• A pure Ge specimen is doped with Al. The number density of acceptor atoms is approximately 10²¹ m⁻³. If the d… GUJCET 2008
• Electrically, an isolated p-type semiconductor is . GUJCET 2009
• A pure Si crystal has 5×10²⁸ atoms m⁻³. It is doped by 1 ppm concentration of pentavalent As. Calculate the n… GUJCET 2020
• Suppose a pure Si crystal has 5×10²⁸ atoms m⁻³. It is doped by 1 ppm concentration of pentavalent As. Calcula… GUJCET 2022
• Which impurity is used to convert pure semiconductor into p-type semiconductor? GUJCET 2024
• Out of the following impurities, which impurity is not a trivalent? GUJCET 2026
• In p-type semiconductor . GSEB Board March 2016
• When will the conductivity of a Ge semiconductor decrease? GSEB Board March 2019
• In an n-type silicon, which of the following statement is true: GSEB Board March 2020
• In an intrinsic semiconductor the number density of free electrons is nₑ and the number density of holes is n… GSEB Board July 2021
• What is the type of the semiconductor, for the energy band diagram shown in the figure? RS Academy GUJCET booklet