Question

When a small amount of impurity atoms are added to a semiconductor then generally its resistivity

• A. decreases.
• B. increases.
• C. does not change.
• D. may increase or decrease depending upon the percentage of doping.

Hint:

Remember, doping a semiconductor introduces charge carriers and reduces its resistivity, improving its conductivity.

Answer 1

The Correct Option is A

Step 1: Effect of impurities on semiconductor.
When impurities are added to a semiconductor (a process known as doping), they introduce free charge carriers which increase the conductivity, thereby decreasing the resistivity.
Step 2: Conclusion.
Thus, the correct answer is (A) decreases.