CUET · PHYSICS · PYQ PAPER 2025

Arrange the following in the increasing order of their energy gap between their conduction and valence bands:
(A) Si
(B) C (diamond)
(C) Ge
(D) Sn
choose the correct answer from the options given below:

A (D), (C), (A), (B)
B (A), (C), (B), (D)
C (B), (A), (D), (C)
D (C), (B), (D), (A)

Verified Solution

Answer & Solution

Correct Answer

(A) (D), (C), (A), (B)

Step-by-step Solution

Detailed explanation

(D), (C), (A), (B) (D) Sn, (C) Ge, (A) Si, (B) C (diamond).

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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Match List-I with List-II

List – I (Name of Reaction)	List – II (Reagents)
(A) Stephens reaction	(I) \(CrO _2 Cl _2 / CS _2\)
(B) Rosenmund reduction	(II) Acyl chloride and anhyd. \(AlCl _3\)
(C) Etard reaction	(III) \(SnCl _2, HCl\)
(D) Friedel Craft acylation	(IV) \(H _2 / Pd - BaSO _4\)

Choose the correct answer from the options given below:

CUET 2025 Easy