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Thursday, 17 July 2014

Engineering Physics-Model question paper for B.E/B.Tech Visvesvaraya technological university

1(a) Explain Planck's theory of blackbody radiation. Derive Rayleigh-Jeans law and Wien's law of it. (8 Marks)
(b) What is the significance of Heisenberg's uncertainty principle. (4 Marks)
(c) Write a note on Compton effect. (4 Marks)
(d) Find the energy values of an electron in its ground state and first excited state when it is moving in a potential well of width 1nm. (4 Marks)
2(a) Derive Schrödinger's time independent wave equation. (6 Marks)
(b) Derive a relation between group velocity and phase velocity. (6 Marks)
(c) What do you mean by normalization of wavefunction? Explain. (4 Marks)
(d) Determine the energy of an electron of wavelength 0.14 nm. (4 Marks)
3(a) Explain drift velocity and relaxation time. (4 Marks)
(b) Explain law of mass action. (4 Marks)
(c) What is Meissner effect? Distinguish between Type I and Type II superconductors. (8 Marks)
(d) The probability of finding an electron in an energy level 0.12 eV is 0.3 at 300 K. Determine the Fermi energy. (4 Marks)
4 (a) What are the failures of classical free electron theory. (6 Marks)
(b) Write a note on Maglev vehicle. (4 Marks)
(c) What is Hall effect? How can you determine the type of semiconductor using Hall effect. (6 Marks)
(d) Write a note on Richardson-Dushmann equation on thermionic emission(4 Marks)
5(a)Derive an expression for energy density of radiation in terms of Einstein co-efficients. (6 Marks)
(b) Explain the recording of a hologram using a neat figure. (6 Marks)
(c) Mention some advantages of optical fibers. (4 Marks)
(d) Determine the numerical aperture and acceptance angle of optical fiber with the following data: fractional index change=0.042 refractive index of cladding=1.43 (4 Marks)
6(a) What is attenuation? Explain different mechanisms of attenuation. (6 Marks)
(b) Explain the working of carbon dioxide laser. (6 Marks)
(c) Write a note on measurement of atmospheric pollutants using laser. (4 Marks)
(d) The transition between two energy levels of energy difference 2 eV results in laser emission. Determine the wavelength of radiation. (4 Marks)
7(a) What are primitive and non-primitive cells? (4 Marks)
(b) What is packing fraction? Determine the packing fraction for sc, fcc and bcc systems. (6 Marks)
(c) Explain perovskite crystal structure. (6 Marks)
(d) X-ray are diffracted from a crystal with interplanar spacing of 0.62 nm. Find the Bragg angle for first order diffraction if the wavelength of X-ray is 0.14 nm. (4 Marks)
8(a) Explain the working of Bragg's X-ray spectrometer. (6 Marks)
(b) Draw and explain the crystal structure of diamond. (6 Marks)
(c) Explain the working of Liquid crystal display. (4 Marks)
(d) Write a note on polymorphism. (4 Marks)
9(a) Write a note on principle, working and applications of scanning electron microscope. (8 Marks)
(b) Explain how ultrafine particles are produced by ball milling method. (4 Marks)
(c)  Distinguish between ultrasonic and supersonic waves. (4 Marks)
(d) Explain what is a shock wave. (4 Marks)
10(a) Explain the method of synthesis of carbon nanotube by pyrolysis method. (6 Marks)
(b) Write a note on experimental analysis of the performance characteristics of Reddy shock tube. (6 Marks)
(c) Define Mach number.(4 Marks)
(d) Write a note on precautions to be taken during sol gel method of nanoparticle synthesis. (4 Marks)