PHYSICS MODEL TEST PAPER OFGIMT ,KANIPLA

GEETA INSTITUTE OF MGMT & TECHNOLOGY, KANIPLA, KURUKSHETRA

PHYSICS MODEL TEST PAPER

UNIT_I

Q1       What are Miller indices? How are the Miller indices of a plane determined? Draw sketches illustrating (2 3 1), (0 1 1), (1 0 0) & (1 1 1) planes in a cubic cell.

Q2       Describe diamond structure and find its packing efficiency.

Q3       Describe powder method to study crystal structures in detail.

Q4       Describe point defects in crystals. Derive expression for Frenkel & Schottky defects.

Q5       Explain X- Ray Diffraction methods.

Q6       What are various types of bonding in crystals. Give characteristics of covalent bonding.

UNIT-II

 

Q7       Derive time independent Schrodinger wave equation. Also explain the physical significance of ψ.

Q8       Derive time dependent Schrodinger wave equation.

Q9       Differentiate between Bose-Einstein and Fermi-Dirac statistics.

Q10     Explain the concept of wave packet in detail.

Q11     Define group velocity and phase velocity. Show that the de-Broglie group velocity associated with the wave packet is equal to the velocity of the particle.

Q12     Prove that the group velocity is less than the phase velocity in a dispersive medium.

Q13     What is the free electron theory of metals? What are its limitations. Derive the expression for conductivity of metals on the basis of Drude-Lorentz theory.

Q14     Obtain expressions for the wave function and energy eigen values for electron confined to a three dimensional box of each side L. Also explain Fermi energy.

Q15     Discuss the phenomenon of thermionic emission in metals. Obtain Richardson-Dushman equation for the current density in thermionic emission.

Q16     What is Fermi function? Derive an expression for density of states.

UNIT-III

Q17     Discuss the origin of energy bands in the solids on the basis of Kronig Penney model. Distinguish between insulators, semiconductors and conductors on the basis of this model.

Q18     Write short notes on the following

(i)            E vs K diagram.

(ii)          Brillouin zones.

Q19     What is Hall effect? Derive expressions for Hall coefficient, Hall angle and mobility for a conducting slab. Also explain the applications of Hall effect.               

Q20     The Hall coefficient of a silicon specimen was found to be -7.35x10^-5 m³C^-1 at 400 K. Determine the nature of the semiconductor. If electrical conductivity was found to be 200 ohm^-1m^-1, calculate density and mobility of charge carriers

                                                                                                                        P.T.O.

UNIT-IV

Q21     What is photoconductivity? Explain simple model to explain the effect of illumination on photoconductivity and photoconductive gain.

Q22     Explain photovoltaic effect. Discuss principle, construction, working and characteristics of photovoltaic cell.

Q23 a) How are atomic magnetic moments produced in atoms.

        b) Differentiate between diamagnetic, paramagnetic and ferromagnetic substances. Explain Langevin’s theory of paramagnetism.

Q24     Give an account of Weiss theory of domains to explain ferromagnetism and derive Curie-Weiss law.

Q25     Discuss Meissner effect in detail.

Q26 a) Give important properties of superconductors.

        b) Derive London’s equations and explain how it accounts for Meissner’s effect and magnetic flux penetration.

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