AIIMS 2018 Physics Intrinsic Semiconductors MCQ Question
Assertion : A pure semiconductor has negative temperature coefficient of resistance.
Reason : In a semiconductor on raising the temperature, more charge carriers are released, conductance increase and resistance decrease.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
In semiconductors, increasing temperature provides thermal energy that can break covalent bonds between atoms, leading to the generation of free electrons and holes. This process enhances electrical conductivity, as the number of charge carriers increases, allowing for better current flow. The other options are not applicable in this context, as they do not provide relevant information or alternatives regarding the behavior of semiconductors with temperature changes. Understanding this concept is crucial for grasping the fundamentals of semiconductor physics and their applications in electronic devices.
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