BE Computer Engineering (IOE, TU) Engineering Physics (IOE, SH 452) Question Paper 2079
This is the official BE Computer Engineering (IOE, TU) Engineering Physics (IOE, SH 452) question paper for 2079, as set in the regular annual examination. It carries 80 full marks and a time allowance of 180 minutes, across 14 questions. On Kekkei you can attempt this Engineering Physics (IOE, SH 452) past paper online with a timer, get instant AI feedback and step-by-step solutions, and track the topics where you lose marks — completely free. Whether you are revising for your BE Computer Engineering (IOE, TU) Engineering Physics (IOE, SH 452) exam or solving previous years' question papers, this 2079 paper is a great way to practise under real exam conditions.
Section A: Long Answer Questions
Attempt all / any as specified.
(a) Set up the differential equation of a damped harmonic oscillator and solve it for the case of light (under) damping. Hence explain the terms relaxation time and quality factor. [6]
(b) A vibrating system of natural frequency 500 Hz has a quality factor of 200. Calculate the relaxation time and the time taken for the amplitude of the freely decaying oscillation to fall to 1/e of its initial value. [4]
(a) State Maxwell's equations in integral form and explain the physical significance of each. Show how Ampere's circuital law is modified by the introduction of the concept of displacement current. [7]
(b) In a region of free space the conduction current is negligible and the electric field is given by E = 50 sin(10^9 t) V/m. Calculate the displacement current density. [3]
(a) Derive the time-independent Schrodinger wave equation for a particle of mass m moving in a one-dimensional potential. [5]
(b) Solve the Schrodinger equation for a particle confined in a one-dimensional infinite potential well of width L and obtain the expressions for the normalized wave functions and the quantized energy eigenvalues. [5]
(a) Explain the formation of Newton's rings in reflected monochromatic light. Show that the diameters of the dark rings are proportional to the square root of natural numbers. [7]
(b) In a Newton's rings experiment the diameter of the 10th dark ring changes from 1.40 cm to 1.27 cm when a liquid is introduced between the lens and the glass plate. Calculate the refractive index of the liquid. [3]
Section B: Short Answer Questions
Attempt all / any as specified.
What is meant by a plane diffraction grating? Derive the grating equation for normal incidence and define the resolving power of a grating.
State and explain Brewster's law. Distinguish between an ordinary ray and an extraordinary ray in a doubly refracting crystal.
Define acceptance angle and numerical aperture of an optical fibre. A step-index fibre has a core of refractive index 1.50 and a cladding of refractive index 1.47. Calculate its numerical aperture and acceptance angle in air.
What is population inversion? Explain why it is essential for laser action, and describe the role of metastable states and optical pumping in achieving it.
State Gauss's law in electrostatics. Using it, derive an expression for the electric field intensity at a point near an infinite uniformly charged plane sheet of charge density sigma.
Derive an expression for the capacitance of a parallel plate capacitor partially filled with a dielectric slab of thickness t and dielectric constant K, the plate separation being d.
State Heisenberg's uncertainty principle. An electron is confined within a region of width 1 x 10^-10 m. Estimate the minimum uncertainty in its momentum and the corresponding minimum kinetic energy.
Explain the Hall effect in a semiconductor. Derive an expression for the Hall coefficient and state two of its practical applications.
What is superconductivity? Explain the Meissner effect and distinguish between Type I and Type II superconductors.
Establish the one-dimensional differential equation of a progressive wave travelling along a stretched string and show that the velocity of the wave depends on the tension and the linear mass density of the string.