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CSS Physics Paper II Past Paper 2025

CSS Physics Paper II 2025 carries 100 marks over 3 hours. It has 7 questions.

Marks
100
Time
3 hours
Questions
7

Years

How to attempt: Attempt ONLY FOUR questions from PART-II. ALL questions carry EQUAL marks.

Questions

Question 1 (Part I) is the paper's MCQs, which are not reproduced here.

  1. Q. 2
    (20)
    • (a)
      Discuss the spectral properties of perfect black body radiation. Explain the ultra violet catastrophe.
      (10)
    • (b)
      Find the fifth & seventh member of Balmer spectral series. If the third member is 1200 A.
      (10)
  2. Q. 3
    (20)
    • (a)
      In quantum mechanics explain the term commutation between the observables.
      (10)
    • (b)
      Explain how De Broglie wave particle duality laid down the fundamentals of uncertainty principle.
      (10)
  3. Q. 4
    (20)
    • (a)
      In the context of nuclear physics explain the magic numbers.
      (10)
    • (b)
      Explain nuclear Quadruple moment and explain its significance.
      (10)
  4. Q. 5
    (20)
    • (a)
      Derive the expression for electric dipole moment. Discuss two uses in modern science.
      (10)
    • (b)
      Discuss Biot and Savart law and derive its expression, using suitable schematic figure.
      (10)
  5. Q. 6
    (20)
    • (a)
      Explain how Hall’s effect could be used to find the sign of charge carriers.
      (10)
    • (b)
      Explain the Hall’s effect. How it could calculate the number of charge carriers in material.
      (10)
  6. Q. 7
    (20)
    • (a)
      Explain the construction and working of photo multiplier tube (PMT).
      (10)
    • (b)
      Compare the energies of a proton and electron having same De Broglie wave length of 1A.
      (10)
  7. Q. 8
    Write short notes any TWO of the following: (10 each)
    (20)
    • (a)
      Reduced mass correction in spectroscopy
    • (b)
      Electron microscope
    • (c)
      Heisenberg uncertainty principal
  1. Part-II is to be attempted on the separate Answer Book.
  2. Attempt ONLY FOUR questions from PART-II. ALL questions carry EQUAL marks.
  3. All the parts (if any) of each Question must be attempted at one place instead of at different places.
  4. Write Q. No. in the Answer Book in accordance with Q. No. in the Q.Paper.
  5. No Page/Space be left blank between the answers. All the blank pages of Answer Book must be crossed.
  6. Extra attempt of any question or any part of the question will not be considered.
  7. Use of calculator is allowed.