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Saturday, 10 October

JEE Main 2025 · ChemistryMultiple choiceOtherMediumApplication

JEE Main 7 April 2025, Shift 1, Chemistry Q52

Question 52 of 75 in this shift, Chemistry question 2 of 25, Section A.

Which of the following statements are correct, if the threshold frequency of caesium is 5.16×10145.16 \times 10^{14} Hz? A. When Cs is placed inside a vacuum chamber with an ammeter connected to it and yellow light is focused on Cs, the ammeter shows the presence of current. B. When the brightness of the yellow light is dimmed, the value of the current in the ammeter is reduced. C. When a red light is used instead of the yellow light, the current produced is higher with respect to the yellow light. D. When a blue light is used, the ammeter shows the formation of current. E. When a white light is used. the ammeter shows formation of current. Choose the correct answer from the options given below:

The figure, in words

Image of the visible spectrum (colour band from violet to red) with a wavelength axis in nanometers marked 400, 500, 600, 700, 750.
  1. (1)B, C and D Only
  2. (2)A, C, D and E Only
  3. (3)A, D and E Only
  4. (4)A, B, D and E OnlyOfficial answer

Official answer

Option 4

NTA final key.

Chapter
Structure of Atom
Topic
Photoelectric Effect
Idea tested
Work Function and Threshold

Same idea in other shifts

Asked 4× in all
  1. 3 Apr 2025, Shift 1 · Q43The work function of a metal is 3 eV. The color of the visible light that is required to cause emission of photoelectrons isEasySingle correct
  2. 31 Jan 2024, Shift 2 · Q46In a photoelectric effect experiment a light of frequency 1.5 times the threshold frequency is made to fall on the surface of…EasySingle correct
  3. 29 Jun 2022, Shift 1 · Q37Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : The photoelectric…EasyAssertion–reason

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.