# ENGINEERING PHYSICS KTU 2016 PREVIOUS QUESTION PAPER WITH ANSWERS FOR S1,S2 FIRST YEAR STUDENTS

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__Engineering Physics KTU 2016 Previous Question Paper with Answers __

**10001 B**

**Reg.No:_______________ Name:________________**

**FIRST SEMESTER B.TECH DEGREE EXAMINATION, JANUARY 2016**

**Course Code:PH101**

**Course Name: ENGINEERING PHYSICS**

Max.Marks:100 Duration: 3 Hours

*Answer ALL questions each carries 2 marks*- What do you mean by quality factor of an oscillator?
- What is the relation between path difference and phase difference in wave motion?
- Two independent source of light can not produce interference fringes. Why?
- Define dispersive power of a grating.
- Distinguish between plane polarized light and unpolarized light.
- What is Miessner effect?
- What is phase space?
- What is the probability interpretation of wave function?
- What is the relation connecting reverberation time and total absorption?
- What is magnetostriction effect?
- Write any two advantage of Hologram over photographic images.
- Distinguish between step index fiber and Graded index fiber.

**PART B**

*Answer any 10 questions. Each question carries 4 marks*
13. Compare an electrical and mechanical oscillator.

14. A transverse wave on a stretched string is described by y(x,t)=4 sin(25t+0.016+Ï€/3) where x and y are in cm and t in second. Obtain the

14. A transverse wave on a stretched string is described by y(x,t)=4 sin(25t+0.016+Ï€/3) where x and y are in cm and t in second. Obtain the

**(i)**speed**(ii)**amplitude**(iii)**frequency and**(iv)**Initial phase at the origin.
15. Newton’s ring arrangement nth dark ring formed by light of wavelength 6000 A0 coincides with (n+1)th dark ring for light of wavelength 4500 A0. If the radius of curvature of convex surface is 90cm, find the diameter of the nth ring for light of wavelength 6000 A0.

16. A plane transmission grating has 6000 lines/cm. Find the angular separation between two wavelengths 500nm and 510nm in the 3rd order.

17. The refractive index of a calcite is 1.658 for ordinary ray and it is 1.486 for extraordinary ray. A slice having thickness 0.9×10-4cm is cut from the crystal. For what wavelength the slice will acts as a

**(i)**Quarter wave plate.**(ii)**Half wave plate.
18. Distinguish between Type I and Type II superconductors with examples.

19. Calculate the De Broglie wavelength of electron whose kinetic energy is 10Kev.

20. Distinguish between Macrostate and Microstate of a system.

21. The volume of a hall is 3000 m3 . It has a total absorption of 100m2 sabine. If the hall is filled with audience who add another 80m2 sabine, then find the difference in reverberation time.

22. What is NDT? and how ultrasonic wave used for NDT?

23. What is the difference between spontaneous emission and stimulated emission?

24. What is LED? Give its working principle?

**PART C**

**Answer any 3 Questions each carries 6 marks.**
25. Considering the transverse vibration in a stretched string, derive the differential equation of one dimensional wave.

26. Light from a monochromatic source is allowed to fall on a single slit. Two lenses are given. With the help of neat diagram write the experimental set up for obtaining the diffraction pattern. Deduce the condition for getting bright and dark regions on the screen. Also obtain the width of central maximum.

27. How a Nicol prism can be constructed from a calcite crystal? How can be it be used as polarizer and as a analyzer?

28. Formulate a Schrodinger’s time dependent equation starting from a plane wave equation by using a de Broglie’s formula and Einstein’s relation for photon Energy.

**PART D**

**Answer any 3 Questions. Each Question carries 6 marks**
29. With a neat diagram explain how ultrasonic waves are produced by piezoelectric oscillator.

30. What are the factors affecting acoustics of a building?

31. Outline the principle and working of Ruby Laser.

32. Define numerical aperture of an optical fiber and derive an expression for NA of step index fibre.

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