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Saturday, 31 October

JEE Main 2021 · PhysicsMultiple choiceSingle correctMediumConceptual

JEE Main 25 February 2021, Shift 2, Physics Q18

Question 18 of 90 in this shift, Physics question 18 of 30, Section A.

For extrinsic semiconductors; when doping level is increased;
  1. (1)Fermi-level of p-type semiconductor will go upward and Fermi-level of n-type semiconductors will go downward.
  2. (2)Fermi-level of p-type semiconductors will go downward and Fermi-level of n-type semiconductor will go upward.Official answer
  3. (3)Fermi-level of p and n-type semiconductors will not be affected.
  4. (4)Fermi-level of both p-type and n-type semiconductors will go upward for T>TFT > T_F K and downward for T<TFT < T_F K, where TFT_F is Fermi temperature.

Official answer

Option 2

NTA final key.

Chapter
Semiconductor Electronics: Materials, Devices and Simple Circuits
Topic
No close match in our taxonomy
Idea tested
No close match in our taxonomy

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.