CUET · PHYSICS · PYQ PAPER 2025

Given is the graph of potential difference (V) across combination of three identical cells in series versus current (I). The emf of each cell would be

A 2 V
B 3 V
C 5 V
D 6 V

Verified Solution

Answer & Solution

Correct Answer

(A) 2 V

Step-by-step Solution

Detailed explanation

From the graph, when \( I = 0 \), total potential difference \( V = 6 \, V \). For three identical cells in series, total EMF \( E_{total} = 3E_{cell} \). \( 6 \, V = 3E_{cell} \) \( E_{cell} = 2 \, V \)

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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From CUET

Match List - l with List - ll

List - I (Terms)	List - II (Features)
(A) Allele	(I) The position on the chromosome where a gene occurs
(B) Locus	(II) Testing a suspected heterozygote by crossing it with a known homozygous recessive
(C) Gene	(III) One of two or more alternative nucleotide sequences at a single gene locus
(D) Test Cross	(IV) A length of DNA that codes for a particular polypeptide or protein

Choose the correct answer from the options given below:

CUET 2023 Easy

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