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DR. BABASAHEB AMBEDKAR TECHNOLOGICAL UNIVERSITY, LONERE — RAIGAD - 402103
End Semester Examination, May 2018
Branch: F.Y. B.Tech. Semester: IT
Subject: Engineering Physics (PHY 203) Marks: 60
Date: 18/ 05/2018 Time: 3 Hrs
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Instructions to the Students:
- Each question carry 12 marks
- Attempt any five questions of the following
- Illustrate your answers with neat sketches, diagrams etc wherever necessary
- If some part or parameter is noticed to be missing, you may appropriately assume it and should mention it clearly
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Q. No.1 Attempt the following.
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Which are the forces involved in Forced Oscillations? Obtain the differential equation of forced oscillations.
06
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What are ultrasonic waves? Describe magnetostriction method for generating ultrasonic waves.
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06
Q. No. 2 Attempt any two of the following.
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In case of Newton's rings in reflected light show that diameter of bright rings is proportional to the square root of odd natural numbers.
In Newton's rings the diameter of a certain bright ring is 0.65 cm and that of tenth ring is 0.95 cm If ?= 6000 Å, calculate the radius of curvature of a convex lens.
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06
-
Give the diagrammatic representation of polarized and unpolarized light.
Explain the method of producing plane polarized light by reflection.
06
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-
Explain the construction and working of He-Ne laser with neat diagram.
06
Q No 3 Attempt the following
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-
What is Q-value of nuclear reaction? Calculate the Q-value of given reaction and state whether reaction is exothermic or endothermic.
3Li7 +1H! - oHe4 + 2He4 + Q
Given Mass of Li = 7.01822
Mass of H=1.00814
Mass of He = 4.00387
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06
Firstranker's choice
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nucleus.
Q. No. 4 Attempt the following.
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Discuss the different types of magnetic materials.
06
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Explain the terms
- Dielectric constant
- Polarizability
06
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Q. No. 5 Attempt the following.
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Prove Bohr magneton µB = eh/ 2m.
06
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What is displacement current? Write Maxwell's equations in differential and integral form.
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06
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