Physics KP PMS Paper II 2018

KHYBER PAKHTUNKHWA PUBLIC SERVICE COMMISSION
SUBJECT:COMPETITIVE EXAMINATION FOR THE POSTS OF PROVINCIAL MANAGEMENT 2018 SERVICE(BPS-17)
PHYSICS PAPER-II
Time allowed: 03 hours Max. Marks:100
Note: Attempt any FIVE complete questions.
Q.1 (a) Calculate the Electric Field of a uniformly moving electron. (10)
(b) Derive Maxwell’s Equations which is based on Faraday’s law of electromagnetic Induction (5)
(c) Write down the expression of Aand @ and give the interpretation of the retarded magnetic vector and scalar potentials, also retarted time. (5)
Q.2
(a) Define the Poynting vector and write expression for it. (5)
(b) Calculate the magnetic induction by Ampere’s circuital law at point r due to a long wire which carries current I. (5)
(c) Calculate the magnetic Induction due to a circular coil. (10)
Q.3 (a) What is the zero-point energy of harmonic oscillator? How is it explained. (12)
(b) Construct time independent Schrödinger equation. (8)
Q.4 (a) The Zeeman component of 500nm spectral line are 0.0116nm when the magnetic field is 1.00 T, Find the ratio e/m for electron from these data? (6)
(b) What is particle exchange operator? What are its eigenvalues? (4)
(c) Explain in detail Pauli Exclusion principle. (10)
Q.5 (a) Name different parts of accelerators. (6)
(b) By how much the atomic mass of the parent exceeds the atomic mass of a daughter when an electron is emitted during beta decay? (2)
(c) Explain theory of Alpha decay in detail. (12)
Q.6 (a) Where do stars get their energy from? (2)
(b) What is the difference between fission and spontaneous fission? (4)
(c) Are there any quark-antiquark combinations that result in non integral electric charge? (4)
(d) What are the similarities among quarks and leptons? (10)
Q.7 (a) What does it mean to say that on-junction is biased in forward direction? (5)
(b) Why is Silicon often preferred to Germanium for making semiconductor devices? (5)
(c) A Silicon crystal is doped with phosphorous to concentration of 1022 phosphorous atoms per cubic meter. On average how far apart are these atoms. (10)
Q.8 (a) If we increase the temperature of a reversed-biased pn junction, what happens to the current? (4)
(b) Would you expect doping to change the resistivity of Silicon by very much? (4)
(c) What are transistors? Explain its different types.