Download DBATU B.Tech 2019 March 2nd Sem Engineering Physics Question Paper

Download DBATU (Dr. Babasaheb Ambedkar Technological University) B Tech (Bachelor of Technology) 2019 March 2nd Sem Engineering Physics Question Paper

DR. BABASAHEB AMBEDKAR TECHNOLOGICAL UNIVERSITY, LONERE
RAIGAD- 402103
Mid semester Examination- March-2019
Branch: Group B ( CSE, ECT, EEP,IT) ? Sem.:- II
Subject: Engineering Physics (BTBSZOZ) . Marks :20
Date: 12/03/2019 Time:1 Hrs
Instructions:-
1. Do not write anything on question paper.
2. ' Neat and labeled diagram must be drawn wherever necessary.
3. Use of non- programmable calculator' IS allowed.
4. F lgures to the right indicatefull marks.
5. Assume suitable data If required
' Q l. Attempt following questions ? (6 Marks)
a) in dielectric, the polarization 1s [C01]
i. linear flinetion of applied ?eld 1 ii. Square function of applied ?eld
iii. exponential function of applied ?eld iv. Logarithmic function of applied ?eld. 1 '
b) In free vibrations, the property that remains constant? 1s '- [C01]
i. Amplitude ? ? ii. Total energy iii. Both iv. None of above ,
c) The substances that rotate plane of polarization are said to be [C02]
1. Optically active . ii. Optically inactive iii. opaque iv. Polaroids.
d) Which of thefollowing can be used to produce ultrasonic wave? [C01]
i. Ni-rod ' ii. Co-rod . iii. Fe?rod iv. All
e) In the structure of optical ?bre cable, the refractive index of core is always... ............... than
the refractive index of cladding._ ~ [C02]
i. less than ii. Equal to iii. greater than iv. none of above.
i) The unit of dipole moment/unit volume is . , [C01]
1. coulomb/meter ii. coulomb/meter2 iii. coulomb/meter3 iv. coulomb
Q. 2. Attempt any TWO of the following (6 Marks)
1) Discuss important applications of ultrasonic waves [.COI]
.11) Explain the structure of optical ?ber and mechanism of light propagation in to the ?ber. [C02]
iii) In Newton? 3 ring experiment, the diameter of the 15?11 ring was found to be 0.59cm and of the 5th
ring was 0.336cm. If the radius of the plano-convex lens is 100cm, compute the wavelength of light
used. I [C02]
Q. 3. Attempt any ONE of the following (8 Marks)
1. ) What IS damped oscillation? Obtain a differential equation for damped vibration and ?nd its solution.
[C01]
ii.)Explair'1 the principle, construction and working of Ruby laser. [CV02]