Which from the following is not a conductor?
A. Aluminum
B. Silicon
C. Graphite
D. All are conductor
Answer
Correct Answer: B. Silicon
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The correct answer is:
B. Silicon
Explanation:
Aluminum is a good conductor of electricity due to the presence of free electrons.
Graphite (a form of carbon) is also a conductor because it has free-moving electrons within its structure.
Silicon is a semiconductor, meaning it does not conduct electricity well under normal conditions but can do so under certain circumstances (e.g., when doped with other elements). Since silicon is not a good conductor like aluminum or graphite, it is the correct answer.