CUET · PHYSICS · PYQ PAPER 2025
C, Si and Ge have the same lattice structure but C is an insulator while Si and Ge are intrinsic semiconductors because
(A) ionisation energy will be least for C, followed by Si and highest for Ge
(B) ionisation energy will be least for Ge, followed by Si and highest for C
(C) number of free electrons for conduction in Ge and Si are negligibly small but significant for C
(D) number of free electrons for conduction in Ge and Si are significant but negligibly small for C
Choose the correct answer from the options given below:
- A (A), (B) and (C) only
- B (B) and (D) only
- C (A), (B), (C) and (D)
- D (B), (C) and (D) only
Answer & Solution
Correct Answer
(B) (B) and (D) only
Step-by-step Solution
Detailed explanation
Statements (B) and (D) correctly explain the difference in electrical properties. (B) Ionization energy decreases down the group (C > Si > Ge). Higher ionization energy for C implies electrons are more tightly bound, leading to a larger band gap and insulating properties. Lower…
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