JNTUH R13 1st year Physics Important Questions

13 Apr 2015    03:06 pm

ENGINEERING PHYSICS IMPOTRANT QUESTIONS 

UNIT-I 

  1. Explain bonding in solids and explain the types of bonding in solid?
  2. Define cohesive energy. Derive an equation for cohesive energy for a diatomic molecule?
  3. Define the following a) Unit cell b) Space lattice c) Lattice parameter d) Atomic radius e) Co-ordinate number f) Packing factor g) Define and explain bravias lattices with crystal systems.
  4. Explain the following structure a) Simple cubic b) Body centered cubic c) Face centered cubic d) Diamond e) Nacl
  5. a) Explain the crystal planes and directions with miller indices? b) Derive an equation for interplanar spacing or orthogonal crystal system?
  6. Derive Bragg’s law. Explain lave method and powder method?
  7. Explain the defects in crystals. Explain Berger vector?

UNIT -2 

  1. Explain dual nature ,deg-broglie hypothesis &matter waves
  2. Explain construction of davission's and germer experiment. Explain Heisenberg Uncertainty principle
  3.  Derive the expressions for the following a)Schrodinger wave independent equation b)Physical significance of '?' c)Particle in 1-D BOx d)Density of energy states
  4.  Define the following: a)Phase space b)Ensembles
  5.  Distuingish between 3 Distribution functions
  6.  Derive the eq'ns for the following a)Fermi energy level at different temp's b)Bloch theorem c)Kronig penny model d)Effective mass of electron with E (v/s) K Diagrams
  7.  Classification of materials into 3 types &explian with BRILLIAN ZONES. 

UNIT-III 

  1. Define the following a) Electric dipole b) Dipole movement c) Dielectric constant d) Polarisability e) Susceptibility f) Displacement vector
  2. Derive the following equations a) Internal fields in solids (or) Lorentz method (or) Local fields in solids (or) clasius-mosotti equation. b) Expression for four polarization process.
  3. Explain the following a) Permeability b) Field intensity c) Magnetic induction (B) d) Magnetization e) Susceptibility
  4. Explain piezo and Ferro electricity?
  5. Explain origin of magnetic movement with Bohr magneton?
  6. Explain the classification of Dia, para, Ferro, Ferri, antiferro on the basis of magnetic movement?
  7. Explain the following a) Domain of ferro magnetism b) Hysterisis curve c) Hard and soft materials d) Superconductivity e) Meissner effect f) Type-I and Type-II superconductors g) Applications of superconductors.

UNIT-4

  1. Derive the following: (a) Interference in thin films. (b) Newton's rings experiment.
  2. Give an expression for Fraunhoffer Diffraction due to single slit and 'n' slits.
  3. Diffraction grating experiment.
  4. Explain the construction and working of Nicol's prism.
  5. Explain the following: (a) characteristics of LASERS. (b) Distinguish b/w Spontaneous and stimulated emission. (c) Population Inversion. (d) Lasing action. (e) Applications of LASERS.
  6. Give an expression for Einstein coefficients and their relations.
  7. Explain the construction and working of the following: (a) Ruby LASER. (b) He-Ne LASER. (c) Hetero and Homo semiconductor LASERS.
  8. What is FIBRE? Explain principle in optical fibre and their applications.
  9. Explain construction of a fibre. Give an expression for Acceptance angle, cone and Numerical aperture.
  10. Explain the types of fibres and optical fibres in Communication systems. 

UNIT-5

  1. Distinguish between intrinsic and extrinsic semiconductors.
  2. Derive an expression for the density of holes in the valence band of an intrinsic Semiconductor
  3. Derive an expression for density of electrons in intrinsic semiconductors.
  4. Derive an expression for carrier concentration of p-type semiconductors.
  5. Explain Hall effect and its importance
  6. Explain the variation of Fermi level with temperature in the case of p-type semiconductors.
  7. Explain the variation of Fermi level with i. Donor concentration ii. Acceptor concentration, in the case of extrinsic semiconductors.
  8. What is Hall effect? Derive an expression for Hall coefficient for p-type semi-conductor.
  9. Derive an expression for density of holes in intrinsic semiconductors
  10. What is Hall effect? Derive an expression for Hall coefficient for n-type semiconductor.
  11. Derive an expression for carrier concentration of n-type semiconductors.
  12. Explain the variation of Fermi level with temperature in the case of n-type semiconductors.
  13. Derive an expression for density of electrons in intrinsic semiconductors.
  14. Explain the variation of Fermi level with temperature in the case of p-type semiconductors
  15. Derive an expression for carrier concentration of n-type semiconductors. Explain Hall effect and its importance. Derive an expression for density of holes in intrinsic semiconductors[7+8]

 

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