MHT CET 2026 Physics question

Not in JEE Advanced syllabus

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

(A)increases
(B)decreasesCorrect
(C)does not change
(D)may increase or decrease depending upon the percentage of doping

Answer: (B)

Solution

Doping an intrinsic semiconductor with trivalent (acceptor) or pentavalent (donor) impurity atoms greatly increases the number of charge carriers: free electrons in n-type, holes in p-type. Conductivity is , so more carriers mean higher conductivity and therefore lower resistivity

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Question ID VK-099322