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 and may have a, b, c as sub questions.
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, typically resulting from the complete transfer of electrons from a metal atom to a non-metal atom.
Explain Burger’s vector.
Answer
A Burger's vector (denoted by b) is a vector that represents the magnitude and direction of the lattice distortion caused by a dislocation in a crystal. It is determined by constructing a closed circuit around the dislocation line in a perfect crystal and comparing it to the same circuit path in the dislocated crystal; the vector required to close the loop is the Burger's vector.
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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