CBSE 2024-25 Competency-Based Questions With Answers: The Central Baord of Secondary Education has officially released the practice question paper for the academic year 2024-25, for the classes 10th and 12th. Competency-focused questions can be helpful for students to secure good marks while referring and practicing them. It will help students to get familiar with the style and format of questions which are expected to appear in the final examinations.
The questions are designied chapter-wise for all the major subject of class 12th. In this article you will find specifically for Class 12 Physics Chapter 6 Dual Nature of Radiation and Matter, the CBSE Board has given the practice question paper for students to understand and up skill there preparation for 2025 examination. At the end of this article free PDF has been attached for the students to access and download.
CBSE Class 12 Physics Chapter 6 Competency-Based Questions
Question 1: Select the correct statement regarding photoelectric emission.
- The number of photoelectrons is proportional to the frequency of the light.
- The work function of the metal varies as a function of the depth from the surface.
- Photoelectrons are ejected from the metals only if the incident radiation has a certain minimum wavelength.
- The photoelectrons produced by a monochromatic incident light incident on the metal surface have a spread of kinetic energies.
Question 2: ASSERTION: A photon is different from a normal particle.
REASON 1: Energy of the photon in motion is purely kinetic as it has no rest energy. REASON 2: A photon travels with the speed of light in vacuum.
REASON 3: Energy of the photon at rest becomes purely potential as its rest mass is zero. Select the correct option.
- Assertion is correct. Only reason 3 is correct.
- Assertion is incorrect. Only Reason 2 is correct.
- Assertion is correct. Only reasons 1 and 2 are correct.
- Assertion is incorrect. Only Reasons 1 & 3 are correct.
Question 3: Light from a source of frequency f > fo (threshold frequency) is incident on a metal surface. If the intensity of incident radiations from the light source is increased keeping the frequency f of light constant, which of the following quantities associated with emitted photoelectrons DOESNOT remain the same?
- only photoelectric current
- only de Broglie wavelength
- both momentum and maximum KE
- both de Broglie wavelength and the photo current
Question 4: Given are the maximum speeds of the photoelectrons corresponding to a
wavelength of incident light on a certain metal surface.
Wave length Maximum speed of the emitted electrons
λ1 v1
λ2 v2
If v2 < v1, then, which of the following is/are CORRECT?
- Wavelength λ1 > Wavelength λ2
- Frequency f1 < Frequency f2
III. Maximum KE due to wavelength λ1 > Maximum KE due to wavelength λ2
- All are correct
- Only III is correct
- Only I and II are correct
- Only II and III are correct
Question 5: Given are the work functions of two materials.
| Material | Work function (eV) |
| Sodium | 2.4 |
| Zinc | 4.3 |
A radiation of wavelength 400 nm is made to fall on each of the above materials. In which of the two materials is the photoelectric emission observed? Take h = 4.1 × 10‐15 eV‐s
Question 6: A light of wavelength 330 nm causes photoelectric emission from a metal of work function 1 eV. What value of collector potential would stop the photoemission? Take hc = 1240 eV‐ nm
Question 7: A light of wavelength 3000 Angstrom emits photoelectrons of maximum KE of 0.5 eV. 2 What will be the maximum KE of photoelectrons if the wavelength is changed to 2000 Angstrom? Take hc = 12400 eV‐Å
Question 8: A powerful UV laser emits radiation of wavelength 300 nm with a power of 5 mW. Determine the number of photons of this beam that strikes a metal surface every second. Take hc ~ 2 x 10‐16 J‐nm
To access all the practice question of Physics Chapter 6 Dual Nature of Radiation and Matter, the complete FREE PDFs are attached here. Click on the 'Download PDF' to get the PDF.
CBSE Class 12 Physics Competency-Based Questions With Answer Key 2024-25 | Download PDF |
Why Comptency Based Questions are Important ?
Competency based questions are important because they help students to understandhow well they can prepare for the examinations. By practicing these question, students gain confidence and strength for the exam they are preparing. It encourages students to reflect on their achievements and understand their strength and weaknesses and also the area of improvements.
Tips To Prepare For Board Exam
Here are some tips which will help you to prepare for board exams:
- Create a Study Plan: Make a study plan before exam will definitely help students. They can break the syllabus into sections and prepare for examinations.
- Understand the Syllabus: Make sure you are familiar with the syllabus and topics which will be asked in your examinations.
- Use Quality Study Materials: With NCERT or prescribed textbooks use additional reference books and guides for ore and better understanding.
- Practice Past Papers: Practice previous year sample papers just to get familiar withhow the questions will be asked and what will be the exam pattern.
- Focus on Conceptual Understanding: Understand the concepts thoroughly rather than just memorising facts.
- Regular Revision: Regularly revise what you've studied to brushup your memory and make shorts notes for quick revision
By following these tips, you can improve your preparation for board exams and increase your chances of achieving your desired results.
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