JNTU
JNTU B.Tech I Year ENGINEERING PHYSICS Previous Question Paper (August - 2018 - R15)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.
Part A
What is Covalent Bond?
Answer
A covalent bond is a chemical bond formed by the sharing of one or more pairs of electrons between two atoms, allowing each atom to achieve a stable electronic configuration.
What is Vander-Waal’s Bond?
Answer
A Van der Waals bond is a weak, short-range attractive force between neutral atoms or molecules. It arises due to temporary fluctuations in electron distribution, creating instantaneous dipoles that induce dipoles in neighboring particles.
Define an Ensemble.
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What is the importance of Density of States?
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Define the Dipole Moment.
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What is the importance of Dielectric Constant? Explain.
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Define Acceptance Cone.
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What is the importance of Step Index fiber?
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Explain about bottom-up approach for synthesis of nanomaterials.
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Define the Reverberation Time.
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Part B
Describe in detail powder method to determine the crystal parameter.
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Deduce the expression for the inter planar distance in terms of Miller indices for a cubic structure.
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Give an account of Ionic Bond, Metallic Bond, Hydrogen Bond and explain with suitable examples.
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Write notes on structure of NaCl crystal.
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On the basis of band theory how the crystalline solids can be classified into conductors, semiconductors and insulators?
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Write an essay on Davisson and Germer’s Experiment.
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Write short notes on Bloch Theorem and Kronig-Penny Model (Qualitatively)
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Write the Physical Significance of the Wave Function in detail.
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Derive an expression for calculation of internal field for a cubic dielectric crystal
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Derive and establish the importance of Clausius - Mossotti Equation.
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Explain in detail the characteristics of B-H curve of ferromagnetic material and What are hysteresis losses? Explain.
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Write short notes on Piezo -electricity and Ferro- electricity.
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Describe principle of Newton rings experiment and derive an expression for radius of curvature of plane convex lens.
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Write a note on Application of Optical Fiber in communication systems with the help of block diagram.
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Write characteristics of Lasers.
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Write notes on Spontaneous and Stimulated Emission of Radiation.
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Derive an expression for carrier concentration in Intrinsic Semiconductors.
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Write notes on Quantum Confinement.
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Write short note on I-V Characteristics of PN Junction diode.
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Write a note on Direct and Indirect Band gap semiconductors.
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