CUET · PHYSICS · PYQ PAPER 2025

The materials and devices do not obey Ohm's law when
(A) The relation between V and I is not unique, i.e., there is more than one value of V for the same current I
(B) The relation between V and I depends on the sign of V
(C) V ceases to be proportional to I
(D) The relation between V and I is linear
Choose the correct answer from the options given below:

A (B), (C) and (D) only
B (A), (B) and (C) only
C (A), (B), (C) and (D)
D (A), (C) and (D) only

Verified Solution

Answer & Solution

Correct Answer

(B) (A), (B) and (C) only

Step-by-step Solution

Detailed explanation

The conditions under which materials and devices do not obey Ohm's law are: (A) The relation between V and I is not unique. (B) The relation between V and I depends on the sign of V. (C) V ceases to be proportional to I. Therefore, the correct choice is (A), (B) and (C) only.

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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