Question

With increase in temperature, the resistivity of a semiconductor?

• A. Increases
• B. Decreases
• C. Remains constant
• D. Becomes zero

Answer 1

The correct option is B Decreases

A semiconductor starts conducting more as the temperature increases. This happens only when its resistance decreases. Clearly since the dimensions of the semiconductor aren’t changing, its resistivity is what decreases.
Note: Resistivity depends on lot of factors like number of free charges per unit volume. Thus adding an impurity can alter resistivity.