CUET · PHYSICS · PYQ PAPER 2025

A voltmeter of resistance \( 600 \text{ } \Omega \) is used to measure the potential drop across \( 300 \text{ } \Omega \) resistor. The measured value of potential drop will be

A 50 V
B 100 V
C 60 V
D 10 V

Verified Solution

Answer & Solution

Correct Answer

(A) 50 V

Step-by-step Solution

Detailed explanation

\(\frac{1}{R_p}=\frac{1}{300}+\frac{1}{600}=\frac{2+1}{600}=\frac{3}{600}\) \(R_p=200 \Omega\) \(R_{\text {total }}=200 \Omega+200 \Omega=400 \Omega\) \(I=\frac{V}{R_{\text {total }}}=\frac{100 V}{400 \Omega}=0.25 A\) \(V_{\text {measured }}=I \times R_p\)…

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.

Same subject

Match List-I with List-II

List-I	List-II
(A) Intrinsic semiconductor	(I) Number of conduction electrons >> number of holes
(B) n-type semiconductor	(II) Number of conduction electrons << number of holes
(C) p-type semiconductor	(III) Net current is zero
(D) p-n junction under equilibrium	(IV) Number of conduction electrons = number of holes

Choose the correct answer from the options given below:

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List-I (Physical quantity)	List-II (Unit)
(A) Threshold frequency	(I) J
(B) Planck's constant	(II) V
(C) Work function	(III) 1/s
(D) Stopping potential	(IV) J s