CSS 2021 Physics Combined Papers Past Paper

Paper details

Examination

CSS

Year

2021

Subject

Physics

Paper

Combined Papers

Subject type

Optional

Mode

Subjective

Questions recorded from this paper

These 12 question wordings are transcribed from CSS Vista’s structured Physics past-paper record for CSS 2021.

1. Q4 · conservation of linear and angular momentum(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) (20)
2. Q2 · Special theory of relativity: Michelson-Morley experiment and Einstein’s postulates(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) (20)
3. Q8 · Special theory of relativity: Michelson-Morley experiment and Einstein’s postulatesWrite notes on any TWO of the following: (10 each) (20) (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.
4. Q6 · Waves and Oscillations, Optics(a) Can you imagine a three dimensional diffraction grating? Describe in detail. (10) (b) Justify the dual nature of light with elaborative examples. (10) (20)
5. Q7 · Three Laws of Thermodynamics(a) State and explain the three laws of Thermodynamics. (10) (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.
6. Q3 · Bose-Einstein and Fermi-Dirac Statistics(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) (20)
7. Q2 · Electric field due to point charges(a) Consider an infinitely long cylindrical insulating shell of inner radius (8) a, and outer radius b, and has a uniform volume charge density ρ. If a line of charge density λ is placed along the axis of the shell then determine the electric field intensity at a point r such that (i) a < r < b and (ii) r > b. (b) Determine the energy density for a capacitor. (6) (c) Discuss the Lorentz force. (6) (20)
8. Q8 · Poynting theorem and Poynting VectorWrite notes on any TWO of the following: (10 marks each) (20) (a) Poynting Vector (b) Fusion in stars (c) MOSFET
9. Q4 · Waves and particles and De Broglie’s Hypothesis(a) Describe the properties of each of, an electron and the light, that show (8) their dual nature. (6) (b) State and explain the de Broglie hypothesis? (c) Metals A, B and C have work functions 2.2eV, 3.6eV and 4.8eV. If a (6) (20) light of wavelength 320nm is incident on these, then find (i) Which metals exhibit photoelectric effect? (ii) Maximum kinetic energy of photoelectron in each case?
10. Q5 · Modern and Quantum Physics(a) Determine the transmission co-efficient for a particle having energy E (14) incident on a rectangular barrier, so that E < V0, the barrier is given by +V for − a < x < a V(x) = { 0 0 for |x | > a (b) For an operator  , we know [Ĥ, Â] = 0, where H ̂ is the Hamiltonian (4) operator, what can we conclude about the eigen states of  and the 〈 Â〉? (c) Give two examples for the operator Â, given in part (b) above. (2) (20)
11. Q3 · spin-1/2 particle in a magnetic field(a) Find the magnetic energy density for the magnetic field of the inductor. (10) (b) Sate and explain the Lenz’s law. (6) (c) Why is the work done by a magnetic field on a charged particle always (4) (20) zero?
12. Q6 · Crystal lattice and structure(a) Describe the electrical conduction in different types of solids in terms of (8) band theory. (b) Explain the crystal structure of diamond. (6) (c) Find the carrier concentration of electrons in Silicon at a temperature (6) (20) of 25 oC.

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