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S H 1045
DR. BABASAHEB AMBEDKAR TECHNOLOGICAL UNIVERSITY, LONERE
First Year B. Tech (Mechanical, Chemical, Civil and Petrochemical)
End Semester Examination -2017°3.
Subject: Engineering Physics
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3 hour Maximum Marks: 60
Instructions to the students:
- All questions are compulsory and each question carries 10 marks
- Illustrate your answers with neat sketches, diagrams etc. wherever necessary.
- Necessary data is given in the respective questions. If such data is not given, it means that the knowledge of the part is part of examination.
- 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.1 Attempt the following.
- a) Obtain the differential equation of damped oscillation and find its general solution. 7
- b) Calculate the natural frequency of the ultrasonic waves generated by a quartz crystal having thickness of 5.5 mm.
Given Y= 80 GPa, p = 2650 kg/m3 3
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Q.2 Attempt the following
- a) Explain theory of Newton’s rings for reflected light. 7
- b) Light of wavelength 5500 A falls normally on a thin wedge shaped film of R.I. 1.4 forming fringes that are 2.5 mm apart. Find the angle of wedge. 3
OR
Q.2 Attempt the following
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- a) Explain the principle and working of He-Ne gas laser 7
- b) The numerical aperture of an optical fiber is 0.5 and Core refractive index is 1.54. Find the refractive index of the cladding. 3
Q.3 Attempt the following.
- a) Explain the principle and working of Bainbridge mass spectrograph. 7
- b) What is Uncertainty principle? Using this principle prove that electron cannot exist in the nucleus. 3
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Q.4 Attempt the following.
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- a) State and prove Mosley’s law. What is its importance? 7
- b) Silver has FCC structure and its atomic radius is 1.414 A. Find the interplaner spacing for (200) planes. 3
Q.5 Attempt the following.
- a) What is Hysteresis Curve? Explain retentivity, coercivity. Explain B-H curve on the basis of domain theory. 4
- b) What is Meissner effect and effect of external magnetic field on superconducting state of material? 6
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At 6 K, critical field is 5 x 10° A/m. Calculate transition temperature when critical field is 2 x 10" A/m at 0 K.
Q.6 Attempt any two of the following.
- a) What is Hall effect? Derive an expression for Hall Coefficient and mobility of charge carriers. 5
- b) What is electric polarization? Explain with diagrams different types of polarizations in dielectric 5
- c) Derive an expression for electromagnetic wave in free space. Find the value of velocity of light in free space. 5
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This download link is referred from the post: DBATU B.Tech Last 10 Years 2010-2020 Question Papers || Dr. Babasaheb Ambedkar Technological University
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