JNTU
JNTU B.Tech I Year ENGINEERING PHYSICS Previous Question Paper (December – 2019/January - 2020 - R13)
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.
Part A
Define Ionic bond.
Answer
An ionic bond is a type of chemical bond formed through the electrostatic force of attraction between oppositely charged ions. It typically occurs when one or more electrons are transferred from a metal atom to a non-metal atom, resulting in the formation of a positively charged cation and a negatively charged anion.
Explain Burger’s vector.
Answer
A Burgers vector is a fundamental vector used in crystallography to define the magnitude and direction of the lattice distortion caused by a dislocation. It represents the closure failure of a Burgers circuit, which is a closed loop drawn around the dislocation line in a perfect crystal lattice.
To determine the Burgers vector, one performs the following steps:
- Construct a circuit of equal number of atomic steps in all directions around the dislocation in the real crystal.
- Repeat the exact same sequence of steps in a perfect, defect-free crystal.
- The additional vector required to close the loop in the perfect crystal is the Burgers vector, denoted by b.
The orientation of the Burgers vector relative to the dislocation line determines the nature of the defect: it is perpendicular for an edge dislocation and parallel for a screw dislocation.
Name the experiments which supports concept of the dual nature of the light?
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Draw E-K diagram.
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Define Electric Susceptibility.
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Explain Meissner Effect.
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What is Interference?
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Explain Lasing Action.
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Explain the term Nano Scale.
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Distinguish between Direct and Indirect Band gap semiconductors.
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Part B
Write a note on Hydrogen Bond.
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Calculate packing factor of BCC.
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Derive an expression of Bragg’s Law.
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Define Vander-Waal’s Bond.
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Estimate Cohesive Energy of diatomic molecule.
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With a diagram explain Powder method.
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Drive an expression of de-Broglie’s hypothesis.
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Discuss Density of States.
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What are Matter Waves?
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Derive Schrödinger’s Time independent wave equation.
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Discuss Kronig-Penny Model.
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Derive an expression of concept of effective mass of an electron.
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Derive an equation for Ionic polarizability.
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What is Hysteresis curve? Explain it using domain theory of ferro magnetism.
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Distinguish between Anti-Ferro and Ferri magnetic materials.
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Derive an expression of Clausius - Mossotti equation.
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Distinguish between Soft and Hard Magnetic Materials.
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What is Ferro- electricity? Explain in details.
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In detail discuss Newton rings experiment.
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With neat diagram explain working principle and construction of He-Ne Laser.
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Explain construction and working of Nicol’s Prism.
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Write a note on Semiconductor diode laser.
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Explain working principle and construction of LED.
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What are the factors affecting the architectural acoustics.
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Explain the term surface to volume ratio.
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Define Reverberation of Time.
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Explain working principle of Photo Diode.
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Write a note on Quantum Confinement.
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