JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech I APPLIED PHYSICS Previous Question Paper (August - 2018 - R16)
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
What is shear modulus?
Answer
Shear modulus, or modulus of rigidity (G), is the ratio of shearing stress to shearing strain within the elastic limit of a material. It measures a material's resistance to shape deformation under shear force.
Derive an expression for work done in stretching a wire.
Answer
When a wire of length L and cross-sectional area A is stretched by a force F, the work done dw for a small extension dl is dw = F dl. Since Young's modulus Y = (F/A) / (dl/L), we have F = (Y A l) / L. Integrating from 0 to extension x:
Substituting F = (Y A x) / L, the work done is W = (1/2) * F * x, which represents the elastic potential energy stored in the wire.
How to control reverberation in a hall?
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What is Echelon effect?
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What is inverse piezoelectric effect?
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What are the advantages of Non-Destructive Testing method?
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What is electronic polarization?
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What is an internal field in dielectrics? Explain.
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Explain Meissner effect.
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Distinguish soft and hard magnetic materials.
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PART - B
State Hooke’s law of elasticity. Draw stress-strain diagram and discuss the behavior of the ductile material under loading.
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Describe in detail factors affecting the elasticity of a materials
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Describe the method of measurement of sound absorption coefficient.
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Explain the Sabine formula of reverberation time
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What are the basic requirements of acoustically good hall?
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Explain the construction and production of ultrasonic waves using Magnetostriction method
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How ultrasonic waves are used in Non-destructive testing for materials.
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What is Orientational polarization? Derive an expression for Electronic Polarizability of dielectric materials?
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Derive an expression for Clausius-Mossotti relation
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Write a short note on piezoelectricity
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Explain in detail the classification of magnetic materials.
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The magnetic susceptibility of Aluminium is 2.3 × 10-5. Find its permeability and relative permeability.
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Explain in detail the type-I and type-II superconductors.
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A superconducting tin has a critical temperature of 3.7K at zero magnetic field and a critical field of 0.0306 Tesla at 0K. Find the critical field at 2K.
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