JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech I Year ENGINEERING PHYSICS Previous Question Paper (March/April - 2023 - R13)
Note: i) Question paper consists of Part A, Part B.
ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions.
iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
PART - A
What is meant by crystal structure?
Answer
A crystal structure is formed by the periodic and ordered arrangement of atoms, ions, or molecules in a three-dimensional space, described by the combination of a lattice and a basis (the motif attached to each lattice point).
Draw the following planes of cubic structure (112), (101), (200).
Answer
To draw these planes in a cubic unit cell, identify the intercepts by taking the reciprocals of the Miller indices (hkl):
- (112): Intercepts are at x=1, y=1, z=1/2.
- (101): Intercepts are at x=1, y=∞, z=1.
- (200): Intercepts are at x=1/2, y=∞, z=∞.
These planes represent the orientation of atom layers within the cubic lattice framework.
What is the physical significance of wave function?
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What explains E- K curve?
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Define piezoelectricity and pyroelectricity.
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Explain the Permeability in magnetism.
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What are the characteristics of laser radiation?
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Mention the different types of losses in optical fiber.
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Mention the applications of Hall Effect.
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Why nonmaterial’s exhibiting different properties?
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PART - B
Derive an expression for the cohesive energy of an ionic crystal.
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Explain the Laue method of crystal structure analysis.
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Explain the formation of an ionic bond. Calculate the cohesive energy of Nacl molecule.
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Mention the different kinds of crystal imperfections.
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Show that the energies of a particle in a potential box are quantized.
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Discuss the Kronig-Penny model for the motion of an electron in a periodic potential.
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What are the matter waves? Explain in detail Thomson experiment to prove the existence of matter waves.
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Explain the origin of energy bands in solids.
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Explain electronic polarization. Derive an expression for electronic polarizability.
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Explain in detail domain theory of ferromagnetism.
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Distinguish between piezo and ferroelectric effects.
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Explain how ferrites are superior to ferromagnetic materials. Discuss hard and soft magnetic materials.
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Discuss about the Newton rings experiment and deduce the equations for the diameters of dark and bright fringes.
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Sketch the ray propagation in different types of optical fibers.
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Distinguish between the spontaneous and stimulated emission processes of light.
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With necessary energy level diagram, explain the working of a Ruby laser.
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Drive an expression for the density of holes in intrinsic semiconductors.
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Explain how the PN junction diode is formed and the rectifying action of PN diode.
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Explain what are the factors are affecting the architectural acoustics, and mention the difficulties are overcome.
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Explain the chemical vapor deposition method to synthesis the nonmaterials.
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