CSS Physics Past Paper 2021

Instructions specific to this paper

• Attempt ONLY FOUR questions from PART-II. ALL questions carry EQUAL marks.
• Use of Calculator is allowed.
• Attempt ONLY FOUR questions from PART-II. ALL questions carry EQUAL marks.

Questions

1. Q. 220 marks

   (a) Describe Einstein postulates of special theory of Relativity. Express the (10) difference between the special and the general theories of Relativity. (b) Establish the energy-mass relationship and give its significance. (10)

2. Q. 320 marks

   (a) Differentiate between Fermi-Dirac, Bose-Einstein and Maxwell Statistics. Give (10) application of each. (b) Draw a labelled diagram of a nuclear reactor and give significance of each part. (10)

3. Q. 420 marks

   (a) Distinguish between the linear and angular momentum. Express Newton’s (10) second law in terms of the linear and angular motion. (b) Discuss the acceptor and rejecter electronic circuits. (10)

4. Q. 520 marks

   (a) Describe and explain the Miller indices. Recognize the symbols <111>, [010], (10) (111). (b) Discuss the closest packed crystal structures. (10)

5. Q. 620 marks

   (a) Can you imagine a three dimensional diffraction grating? Describe in detail. (10) (b) Justify the dual nature of light with elaborative examples. (10)

6. Q. 710 marks

   (a) State and explain the three laws of Thermodynamics. (b) What is a heat engine? Determine the efficiency of the engine if it takes 10,000 J (10) (20) of heat and delivers 2000 J of work per cycle.

7. Q. 820 marks

   Write notes on any TWO of the following: (10 each) (a) Mickelson-Morley experiment and its latest usage in a recent Nobel award. (b) Unification of forces and Abdus Salam contribution. (c) An essay on Large Hadron Partical Accelerator.

Standard FPSC instructions

Printed on this and every CSS paper.

• Part-II is to be attempted on the separate Answer Book.
• All the parts (if any) of each question must be attempted at one place instead of at different places.
• Write Q. No. in the Answer Book in accordance with Q. No. in the question paper.
• No page/space be left blank between the answers. All the blank pages of the Answer Book must be crossed.
• Extra attempt of any question or any part of the attempted question will not be considered.