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# Examination Question of physics for information science , material science , physics for civil engineering - Anna university - 2018

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Reg.No 12. (a) Explain extrinsic semiconductor with a neat energy band diagram and also explain how the carrier concentration varies with temperature in a semiconductor. (16) (OR) GANESH COLLEGE OF ENGINEERING, SALEM – 111. MODEL EXAM Subject: PH8252 – PHYSICS FOR INFORMATION SCIENCE B.E ., COMPUTER SCIENCE AND ENGINEERING Date: 28.04.2018 Duration: 3 hours Max. Marks: 100 Answer All Questions PART A – (10 x 2 =20 Marks) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Differentiate electrical conductivity and thermal conductivity. What are degenerate and non-degenerate states? What are the differences between elemental and compound semiconductors? Give examples. Why compound semiconductors are called direct band gap semiconductors? Give its application. Distinguish between Ohmic and Schottky contacts. What is Bohr Magnetron? Write its value. Define Giant Magneto Resistance. Define luminescence and write the different types of luminescence? Mention any two merits and demerits of Solar cell. How band gap of a bulk material is different from nano materials? Answer All Questions PART – B (5 x 16 = 80 Marks) 11. (a) Deduce mathematical expressions for electrical conductivity and thermal conductivity of a conducting material and hence obtain Weidemann-Franz law. (16) (OR) (b) (i) Explain effective mass of an electron and deduce an expression for the effective mass.(8) (ii) Derive an expression for the effective mass of an electron moving in energy bands of a solid .Show that it varies with the wave vector.(8) (b) (i) Obtain an expression for the density of electrons in the conduction band of an N-type semiconductor.(13) (ii) (ii) Derive an expression for drift transport and diffusion transport. (3) 13. a.(i) Explain ferromagnetic domain theory. Explain different types of energy involved in domain growth. (13) (ii) Write the difference between hard and soft magnetic materials with examples. (3) (OR) b.(i) Discuss the Weiss theory of ferromagnetism .Write the merits and demerits. (13) (ii) (ii)Write notes on any two magnetic storage devices. (3) 14. a (i) Explain absorption and emission of light in metals, insulators and semiconductors. (13) (ii) List any four applications of photodiode. (3) (OR) b (i) Explain with suitable diagram how laser action is achieved in homo junction and hetro junction diode laser. (13) (ii) Explain the terms luminescence, phosphorescence, and fluorescence. (3) 15. a. (i) Derive an expression for density of states in quantum well, quantum wire and quantum dot structures.(13) (iiWrite a note on Band gap of nano materials. (3) (OR) b. (i) Describe carbon nano tubes with their properties and applications. (13) (ii) Define quantum well. (3) STAFF INCHARGE QPSC HOD PRINCIPAL

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Reg.No (OR) (b) i) Describe the methods of sound absorption in buildings. (8) ii) How will you estimate absorption coefficient of the hall? (8) GANESH COLLEGE OF ENGINEERING, SALEM – 111. MODEL EXAM Subject: PH8252 – PHYSICS FOR CIVIL ENGINEERING B.E ., CIVIL ENGINEERING Date: 28.04.2018 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Duration: 3 hours Max. Marks: 100 Answer All Questions PART A – (10 x 2 =20 Marks) List few factors which affect performance of the building. What are the types of water piping? State Weber-Fechner law. What are the acoustical factors to be considered while construct any building? Define Radiant intensity. State Cosines law. What are Photopic, mesopic and scotopic?. What are the types of composites based on matrix materials? Distinguish between crystalline and Non crystalline ceramics. Explain P - waves and S-waves. 13. a State Cosines law and derive the expression for intensity of illumination. (16) (OR) b. Explain colour – luminous efficiency function. (16) 14. a. What are shape memory alloys? How are they prepared? Explain with neat diagram their characteristics. List out any four applications of shape memory alloys. (16) (OR) b . Explain thermal, mechanical, electrical and chemical properties of Ceramic materials.(16) 15. a. Discuss earthquake ground motion with types, intensity and magnitude. (16) (OR) b. Discuss the Deterministic seismic hazard analysis. (16) Answer All Questions PART – B (5 x 16 = 80 Marks) 11. a (i) What is meant by fenestration and what are the advantages? (8) ii) Describe the benefits of thermal insulation. (8) (OR) (b) (i) Write short note on (i) Fan coil system with its block diagram.(8) (ii) Designing o f natural ventilation. (8) 12. (a) Derive Sabine’s formula for the reverberation time of a Hall. Explain the growth and decay of sound energy. (16) STAFF INCHARGE QPSC HOD PRINCIPAL

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Reg.No 12. (a) Draw TTT diagram for eutectoid steel and explain biantic and martenstic transformation.(16) (OR) GANESH COLLEGE OF ENGINEERING, SALEM – 111. MODEL EXAM 13. (a). Explain the various properties obtained from tensile test using stress-strain curve. (16) Subject: PH8251 MATERIALS SCIENCE B.E ., MECHANICAL ENGINEERING Date: 28.04.2018 Duration: 3 hours (b). What is diffusion? Derive Fick’s First and second law of diffusion equation. (16) Max. Marks: 100 (OR) (b). Discuss in detail about Vickers microhardness test with its advantages and disadvantages. (16) Answer All Questions PART A – (10 x 2 =20 Marks) 1. Differentiate substitutional and interstitial solid solutions with examples. . 2. What is tie-line rule for phase diagrams? 3. What feature in the iron-carbide diagram is used to distinguish between steels and cast irons? 4. State Fick’s law of diffusion. 5. Define creep and creep resistance. 6. Define hardness. 7. List the properties of ferroelectric materials. 8. Define superconductivity. 14. ( a). Explain ferromagnetic domain theory. Briefly explain different types of energy involved in domain growth. (16) (OR) (b) . Discuss about electronic, ionic, orientational and space-charge polarizations with examples in detail.(16) 15.( a). How are composites classified based on the matrix phase. Compare them based on their properties and applications. (16) (OR) (b). What are shape memory alloys (SMA)? Describe the characteristics of SMA and its applications? (16) 9. State the advantages of fibre reinforced composites. 10. What is meant by shape memory effect? Answer All Questions PART – B (5 x 16 = 80 Marks) 11. (a) Explain in detail about the changes in microstructure during cooling with a neat diagram. (16) (OR) (b) (i) What is solid solution? Discuss the Hume Rothery’s rule for forming solid solution. (16) STAFF INCHARGE QPSC HOD PRINCIPAL