CUET · PHYSICS · PYQ PAPER 2025

Read the following features of the Photoelectric effect.
(A) The maximum kinetic energy of the photoelectrons varies linearly with the frequency of incident radiation
(B) The maximum kinetic energy of the photoelectrons is dependent on its intensity.
(C) For a frequency of incident radiation, lower than the cut-off frequency, photoelectric emission is possible even if the intensity is not large.
(D) Ultraviolet light can eject photoelectrons from copper even if visible light does not eject
Choose the correct answer from the options given below:

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

Verified Solution

Answer & Solution

Correct Answer

(B) (A) and (D) only

Step-by-step Solution

Detailed explanation

Statement (A) is correct: According to Einstein's photoelectric equation, \(K_{\max }=h \nu-\phi_0\), the maximum kinetic energy increases linearly with the frequency \((\nu)\) of the incident light. Statement (D) is correct: Ultraviolet light has a higher frequency than visible…

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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(C) Eddy current loss	(III) Using thick wires
(D) Hysteresis	(IV) By using soft iron core

Choose the correct answer from the options given below :

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Match List-I with List-II

List-I (AC circuit)	List-II (Features)
(A) Only resistor in a circuit	(I) Current leads or lag the voltage
(B) Only capacitor in a circuit	(II) Voltage and Current are in phase
(C) Only inductor in a circuit	(III) The current lags the voltage by \(\frac{\pi}{2}\)
(D) Series LCR circuit \(X_C \neq X_L\) and \(R \neq 0\)	(IV) The current leads the voltage by \(\frac{\pi}{2}\)

Choose the correct answer from the options given below :

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