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ENGINEERING PHYSICS, collection of exams, Study notes of Engineering Physics

Jamia Millia IslamiaEngineering Physics

B.Tech Semester Supplimentary Examinations, June 2009 ENGINEERING PHYSICS wavelength, cavity resonator, Ruby laser, Thomson effect, Porcelain, Interference and Diffraction, B-H curve for a ferromagnetic material, refractive index, Polarization, Peltier effect, dielectric materials, (a) High temperature materials (b) Thermal Protection (c) Structural materials Newton’s rings, Fraunhofer diffraction

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Code No: RR10103 Set No. 1
I B.Tech Semester Supplimentary Examinations, June 2009
ENGINEERING PHYSICS
( Common to Civil Engineering, Mechanical Engineering, Chemical
Engineering, Mechatronics, Metallurgy & Material Technology, Production
Engineering, Aeronautical Engineering and Automobile Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
⋆⋆⋆⋆⋆
1. (a) Derive an expression for fringe width in interference pattern and show that
the fringes are uniformly spaced, with relevant ray diagram.
(b) Light of wavelength 500 nm forms interference pattern on a screen at a distance
of 2 m from the slit. If 100 fringes are formed within a distance of 5 cm on
the screen, find the distance between the slits. [12+4]
2. (a) What is meant by diffraction of light? Explain it on the basis of Huygen’s
wave theory.
(b) What are the types of diffraction and give the difference between them.
(c) What is the difference between Interference and Diffraction? [6+6+4]
3. (a) Explain the following:
i. Polarized light
ii. Double refraction
iii. Non-destructive testing
(b) Calculate the thickness of a quarter wave plate for a monochromatic light of
wavelength 600 nm if the refractive indices of ordinary and extra-ordinary rays
in the medium are 1.5442 and 1.5533 respectively. [12+4]
4. (a) Explain the need of a cavity resonator in a laser.
(b) With the help of suitable diagrams, explain the principle, construction and
working of a Ruby laser. [6+10]
5. (a) Explain Thomson effect.
(b) State and explain
i. law of intermediate metals and
ii. law of intermediate temperatures.
(c) For a thermo-couple, the neutral temperature is 320 ◦C. If the cold junction
is at 20 ◦C , calculate the temperature of inversion. [4+8+4]
6. (a) How are the dielectric materials classified?
(b) Write short notes on “Porcelain”. [10+6]
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Download ENGINEERING PHYSICS, collection of exams and more Study notes Engineering Physics in PDF only on Docsity!

I B.Tech Semester Supplimentary Examinations, June 2009 ENGINEERING PHYSICS ( Common to Civil Engineering, Mechanical Engineering, Chemical Engineering, Mechatronics, Metallurgy & Material Technology, Production Engineering, Aeronautical Engineering and Automobile Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆ ⋆ ⋆ ⋆ ⋆

  1. (a) Derive an expression for fringe width in interference pattern and show that the fringes are uniformly spaced, with relevant ray diagram. (b) Light of wavelength 500 nm forms interference pattern on a screen at a distance of 2 m from the slit. If 100 fringes are formed within a distance of 5 cm on the screen, find the distance between the slits. [12+4]
  2. (a) What is meant by diffraction of light? Explain it on the basis of Huygen’s wave theory. (b) What are the types of diffraction and give the difference between them. (c) What is the difference between Interference and Diffraction? [6+6+4]
  3. (a) Explain the following: i. Polarized light ii. Double refraction iii. Non-destructive testing (b) Calculate the thickness of a quarter wave plate for a monochromatic light of wavelength 600 nm if the refractive indices of ordinary and extra-ordinary rays in the medium are 1.5442 and 1.5533 respectively. [12+4]
  4. (a) Explain the need of a cavity resonator in a laser. (b) With the help of suitable diagrams, explain the principle, construction and working of a Ruby laser. [6+10]
  5. (a) Explain Thomson effect. (b) State and explain i. law of intermediate metals and ii. law of intermediate temperatures. (c) For a thermo-couple, the neutral temperature is 320 ◦C. If the cold junction is at 20 ◦C , calculate the temperature of inversion. [4+8+4]
  6. (a) How are the dielectric materials classified? (b) Write short notes on “Porcelain”. [10+6]
  1. (a) Draw and explain B-H curve for a ferromagnetic material placed in a magnetic field. (b) Discuss the theory of paramagnetism. (c) State the properties of diamagnetic materials. [6+6+4]
  2. (a) What are the general requirements for spacecraft materials?

(b) What are the different classifications of the spacecraft materials? Explain how they are classified? [6+10]

(b) Write short notes on “Porcelain”. [10+6]

  1. (a) Describe the hysteresis of a ferro-magnetic material.

(b) Explain the properties and applications of ferrites. (c) Calculate the paramagnetic susceptibility at room temperature for iron oxide, when the material density is 5 × 1028 atoms / m^3. [6+6+4]

  1. Write notes on the following:

(a) High temperature materials (b) Thermal Protection (c) Structural materials [6+5+5]

I B.Tech Semester Supplimentary Examinations, June 2009 ENGINEERING PHYSICS ( Common to Civil Engineering, Mechanical Engineering, Chemical Engineering, Mechatronics, Metallurgy & Material Technology, Production Engineering, Aeronautical Engineering and Automobile Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆ ⋆ ⋆ ⋆ ⋆

  1. (a) State and explain conditions for interference of light. (b) Compare the formation of Newton’s rings by reflected light with rings formed by transmitted light. (c) Two coherent light sources whose intensity ratio is 8:1 produce interference fringes. Find the ratio of maximum to minimum intensity. [6+6+4]
  2. (a) Describe Fraunhofer diffraction due to N parallel slits. (b) Describe the action of plane transmission grating in producing diffraction spec- trum. (c) Show that the grating with 500 lines per cm cannot give a spectrum in the fourth order for a light of wavelength 5890 A.U. [6+6+4]
  3. (a) Distinguish between polarized and unpolarized lights. (b) What is Brewster’s law? Explain how this can be used to find the polarizing angles of various crystals. (c) Find the Brewster angle for a glass slab (μ =1.5) immersed in water (μ =4/3). [6+6+4]
  4. (a) Explain the need of a cavity resonator in a laser. (b) With the help of suitable diagrams, explain the principle, construction and working of a Ruby laser. [6+10]
  5. (a) What is specific heat of a solid? Discuss its variation with temperature. (b) Obtain an expression for the lattice specific of a solid on the basis of Einstein’s model. [6+10]
  6. (a) How are the dielectric materials classified? (b) Write short notes on “Glass”. [10+6]
  7. Write notes on the following:

(a) Soft magnetic materials (b) Hard magnetic materials (c) Hysteresis curve. [5+5+6]

I B.Tech Semester Supplimentary Examinations, June 2009 ENGINEERING PHYSICS ( Common to Civil Engineering, Mechanical Engineering, Chemical Engineering, Mechatronics, Metallurgy & Material Technology, Production Engineering, Aeronautical Engineering and Automobile Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆ ⋆ ⋆ ⋆ ⋆

  1. (a) Derive an expression for fringe width in interference pattern and show that the fringes are uniformly spaced, with relevant ray diagram. (b) Light of wavelength 500 nm forms interference pattern on a screen at a distance of 2 m from the slit. If 100 fringes are formed within a distance of 5 cm on the screen, find the distance between the slits. [12+4]
  2. (a) What is meant by diffraction of light? Explain it on the basis of Huygen’s wave theory. (b) What are the types of diffraction and give the difference between them. (c) What is the difference between Interference and Diffraction? [6+6+4]
  3. (a) Explain the following: i. Polarization by selective absorption ii. Polarization by scattering. (b) Prove that if the angle of incidence corresponds to the Brewster’s angle, then the angle between reflected and refracted beams is 90o. [10+6]
  4. (a) Describe the construction of a typical optical fiber and give the dimensions of the various parts. (b) Define the acceptance angle and numerical aperture. Obtain an expression for the numerical aperture of an optical fiber. (c) Calculate the numerical aperture and acceptance angle for an optical fiber with core and cladding refractive indices being 1.48 and 1.45 respectively. [6+6+4]
  5. (a) What is specific heat of a solid? Discuss its variation with temperature. (b) Obtain an expression for the lattice specific of a solid on the basis of Einstein’s model. [6+10]
  6. (a) Explain the terms: i. dielectric displacement, and ii. relative dielectric constant. (b) Obtain an expression for the dielectric loss in a dielectric. [6+10]
  7. (a) Explain the terms:

i. Magnetic flux density ii. Magnetic field strength iii. Magnetization iv. Magnetic susceptibility. How they are related to each other? (b) What are hard and soft magnetic materials? Write their characteristic prop- erties and applications. (c) The magnetic field strength in silicon is 1000 amp / m. If the magnetic field susceptibility is − 0. 3 × 10 −^5 ; calculate the magnetization and flux density in silicon. [6+6+4]

  1. (a) What are the general requirements for spacecraft materials?

(b) What are the different classifications of the spacecraft materials? Explain how they are classified? [6+10]