JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech I Year APPLIED PHYSICS Previous Question Paper (January/February - 2024 - R16)
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
Define elasticity.
Answer
Elasticity is the property of a material by virtue of which it regains its original shape and size after the removal of the deforming force applied to it. A perfectly elastic body is one that recovers its original configuration completely and instantaneously upon the removal of the deforming force.
Explain the terms in the rigidity modulus of a torsional pendulum.
Answer
The rigidity modulus (G) of a material can be determined using a torsional pendulum, where the relationship is given by the formula:
The terms in this expression are defined as follows:
- I: The moment of inertia of the suspended disc or body about the axis of rotation.
- L: The length of the suspension wire or rod.
- T: The time period of one complete torsional oscillation of the pendulum.
- r: The radius of the suspension wire.
Give the factors affecting the elasticity.
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How the term acoustically good wall is explained.
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Distinguish between ultrasonics and infra sonics.
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Write the detection of ultrasonics.
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Define the terms Electric dipole and dipole moment.
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Discuss the phenomenon of pyroelectricity and piezoelectricity.
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Define field intensity and magnetic susceptibility.
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Explain Meissner effect in super conductors.
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Part B
Write the elastic behavior of a material.
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Obtain the relation between three modulii of elasticity.
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Define stress, strain, Hook’s law and Young’s modulus.
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Derive the expression for work done per unit volume in deforming a body.
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Derive Sabine’s mathematical relation for reverberation time.
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Discuss the construction of acoustically good movie theater.
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Write a note on acoustic quieting.
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Write the measures to be taken to built a acoustically good stadium.
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Describe the Piezoelectric method in production of ultrasonic wave.
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Write the properties of ultrasonic waves.
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Write the production of ultrasonic waves by magnetostriction method.
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Write the use of ultrasonics for non-destructive testing.
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Write in detail electronic, ionic and orientation polarizations.
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Explain local field. Derive the expression for internal field for solids.
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Obtain Clausius – Mosotti equation.
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Explain the phenomenon of ferroelectricity and discuss the ferroelectric behaviour of barium titanate.
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Distinguish between dia, para and ferro magnetic materials.
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Describe the hysteresis curve based on domain theory.
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Write the properties of ferrites.
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Discuss the applications of superconductors.
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