PHYSICS

JAMB 2015 - Question 8

Physics 2015 JAMB Past Questions - Question 8: A silicon material is dopped with an element of a certain group and an n-type semi-conductor is formed. The most likely group of the element is

Choose the correct answers from the options given.
A silicon material is dopped with an element of a certain group and an n-type semi-conductor is formed. The most likely group of the element is
A:
B:
C:
D:
Examkits App

Examkit's JAMB CBT App

Practice JAMB offline with our Online, PC and Mobile App

  • ✅ 25+ years of past questions (2000 to 2025)
  • ✅ Video solutions and explanation to questions
  • ✅ E-library
  • ✅ Study by topic
  • ✅ And more.

Correct Answer

C

Explanation

If a silicon material is doped with an element to create an n-type semiconductor, the most likely group of elements the dopant belongs to is Group V of the periodic table. Group V elements have five valence electrons, and when they are used as dopants in silicon, they introduce extra electrons into the crystal lattice, creating an excess of negative charge carriers (electrons). This results in the formation of an n-type semiconductor, where electrons are the majority charge carriers.

Common elements from Group V that are used as dopants in silicon to create n-type semiconductors include phosphorus (P), arsenic (As), and antimony (Sb). Phosphorus is one of the most commonly used dopants for this purpose due to its prevalence and effectiveness in introducing extra electrons into the silicon lattice. These extra electrons are mobile charge carriers, which significantly enhance the conductivity of the material.

Frequently Asked Questions

Examkits is a JAMB CBT practice platform that provides over 20 years of past questions, Post UTME questions, and detailed video solutions to help students prepare for their exams.

You can practice JAMB past questions online, on Android, or on a desktop using the Examkits app. Just register on our website and choose your preferred device.

Yes. Our Android and Windows versions support offline usage. Once downloaded and activated, no internet is required to use most of the features.

Yes, Examkits provides detailed video explanations for all JAMB past questions from 2000 to 2024, helping students understand how to solve each problem.

Examkits offers free practice for some subjects. However, full access requires a one-time affordable activation fee for each version of the app.