When a small amount of impurity atoms are added to a semiconductor then generally its resistivity (a) increases (b) decreases (c) does not change (d) may increase or decrease depending upon the percentage of doping

Answer: (b). Doping adds a large number of extra carriers (electrons or holes). Conductivity σ = e(neμe + nhμh) increases, so resistivity decreases. So the answer is (b) decreases.

When a small amount of impurity atoms are added to a semiconductor… | MHT CET 2026 (16 Apr, Shift 1)

Q8MHT CET 2026 · 16 APR · SHIFT 1Easy

Intrinsic & Extrinsic Semiconductors

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

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Answer: (b)

Doping adds a large number of extra carriers (electrons or holes).
Conductivity $\sigma = e(n_e\mu_e + n_h\mu_h)$ increases, so resistivity decreases.
So the answer is (b) decreases.

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