Download DBATU B.Tech 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)

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Subject: Engineering Physics (BTBS202)

Sem.:- II

Date: 12/03/2019

Marks:20

Time:1 Hrs

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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. Figures to the right indicate full marks.

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5. Assume suitable data if required.

Q.1. Attempt following questions (6 Marks)

1. In dielectric, the polarization is [CO1]
   1. linear function of applied field
   2. Square function of applied field
   3. exponential function of applied field

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   4. Logarithmic function of applied field.
2. In free vibrations, the property that remains constant is [CO1]
   1. Amplitude
   2. Total energy
   3. Both

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   4. None of above
3. The substances that rotate plane of polarization are said to be [CO2]
   1. Optically active
   2. Optically inactive
   3. opaque

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   4. Polaroids.
4. Which of the following can be used to produce ultrasonic wave? [CO1]
   1. Ni-rod
   2. Co-rod
   3. Fe-rod

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   4. All
5. In the structure of optical fibre cable, the refractive index of core is always.......... than the refractive index of cladding. [CO2]
   1. less than
   2. Equal to
   3. greater than

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   4. none of above.
6. The unit of dipole moment/unit volume is [CO1]
   1. coulomb/meter
   2. coulomb/meter²
   3. coulomb/meter³

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   4. coulomb

Q. 2. Attempt any TWO of the following (8 Marks)

1. Discuss important applications of ultrasonic waves [CO1]
2. Explain the structure of optical fiber and mechanism of light propagation in to the fiber.[CO2] FirstRanker.com

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3. Explain the principle, construction and working of Ruby laser.
4. In Newton's ring experiment, the diameter of the 15th 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. [CO2]

Q.3. Attempt any ONE of the following (6 Marks)

1. What is damped oscillation? Obtain a differential equation for damped vibration and find its solution. [CO1]

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