Download DBATU B-Tech 1st Year 2019 Mid Semester PHY1202 Engineering Physics Question Paper

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DR. BABASAHEB AMBEDKAR TECHNOLOGICAL UNIVERSITY, LONERE

Mid Semester Examination — October 2019

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Course: B. Tech in Civil/Mechanical Sem.: I

Subject Name: Engineering Physics Subject Code: PHY1202

Max Marks: 20 Date: 04/10/2019 Duration:- 1 Hr.

Instructions to the Students:

1. Illustrate your answers with neat sketches, diagrams etc. wherever necessary.

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2. Use of non-programmable calculator is allowed.
3. If some part or parameter is noticed to be missing, you may appropriately assume it.

(Level/CO) Marks

Q.1 Attempt following Questions 6

1. If the damping is smaller then the resonance will be, CO-1
   

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   a) flatter b) sharper c) none of these d) both a and b
2. Length of Nickel rod needed to produced ultrasonic wave of frequency 40 CO-1 KHz is, (Given: Density = 9.99 Kg/m?, Y= 8 X 10¹⁰ N/m?).
   a)1.2 cm b) 1.58 m
   c)1.1m d) 1.4 cm
3. Depth of sea calculated by using formula, CO-1
   

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   a) D= b) D=2
   c) D = d) D=0
4. In doubly refracting crystal along optical axis CO-1
   A p_o>p_e b) p_o=p_e c) p_o

   e d) p_o=p_e?

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5. The active material in He-Ne laser is, CO-1
   a) Ne b) He c) Cr d) All of these
6. The diameter of the n^th dark Newton’s ring is given by formula, CO-1
   a) D_n²=(2n+1)?R b) D_n² = (3n+1)?R c) D_n²=2n?R d) D_n² = 4n?R

Q.2 Solve Any Two of the following. 3X2

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1. (A) State Piezoelectric, Inverse Piezoelectric and Magnetostriction effect. CO-1
2. (B) Explain spontaneous and stimulated emission of radiation. CO-1
3. (C) Describe the structure of optical fiber. CO-1

Q.3 Solve Any One of the following. 8

1. (A) Explain Piezo electric effect for the production of ultrasonic wave. CO-1

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2. (B) Explain Ruby laser with neat labeled diagram. CO-1

*kek End *kk

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