May2006 Engineering Physics Rr10103

Set No. 1

Code No: RR10103

I B.Tech Supplementary Examinations, Apr/May 2006 ENGINEERING PHYSICS ( Common to Civil Engineering, Mechanical Engineering, Chemical Engineering, Mechatronics, Metallurgy & Material Technology and Production Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) What is the principle of superposition? Explain the phenomenon of interference of light. (b) Describe Young’s double slit experiment and derive an expression for the intensity of light on the screen. [8+8] 2. (a) Give the theory of Fraunhofer diffraction due to a single slit and hence obtain the condition for primary and secondary maxima. Using this obtain intensity distribution curve. (b) Find the angular width of the central maximum in the Fraunhofer diffraction using a slit of width 1 mm when the slit is illuminated by light of wavelength 600 nm. [12+4] 3. (a) What is meant by polarization of light? (b) Describe an experiment that shows light is not propagated as longitudinal waves. (c) What is plane of vibration?

[6+6+4]

4. (a) Explain the terms: i. ii. iii. iv. v. vi.

Absorption. Spontaneous emission. Stimulated emission. Pumping mechanism. Population inversion. Optical cavity.

(b) Mention the medical applications of lasers.

[12+4]

5. (a) Write notes on i. Thermo-gravimetric analysis and ii. Thermo-mechanical analysis. (b) The junctions of a thermo-couple are maintained at the ice point and steam point. Calculate i. thermo-e.m.f., ii. thermo-electric power, 1 of 2

Set No. 1

Code No: RR10103 iii. neutral temperature and iv. inversion temperature,

if the variation of the thermo-e.m.f. (E) with temperature difference between the junctions (t), is given by E = (35.6 × 10−6 )t − (0.145 × 10−6 )t2 . [10+6] 6. (a) How are the dielectric materials classified? (b) Write short notes on “Porcelain”.

[10+6]

7. (a) How are the superconductors classified? Explain their properties. (b) What is Meissner effect? (c) Write notes on the applications of superconducting materials.

[6+4+6]

8. (a) State and explain elasticity and plasticity. (b) Compare the elastic and plastic deformation. (c) Explain the significance of toughness and reliance. ⋆⋆⋆⋆⋆

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[6+5+5]

Set No. 2

Code No: RR10103

I B.Tech Supplementary Examinations, Apr/May 2006 ENGINEERING PHYSICS ( Common to Civil Engineering, Mechanical Engineering, Chemical Engineering, Mechatronics, Metallurgy & Material Technology and Production Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Explain the principle of superposition of waves. (b) Explain the phenomenon of interference. (c) With relevant diagram explain Young’s experiment on the basis of wave theory. [5+5+6] 2. (a) Differentiate between interference and diffraction. (b) Explain Rayliegh’s criterion for resolving power of a telescope. (c) A plane transmission grating having 6000 lines/cm is used to obtain a spectrum of light from a sodium lamp in the second order. Calculate the angular separation between two sodium lines D1 and D2 of wavelengths 5890 A.U. and 5896 A.U. [6+6+4] 3. (a) What is meant by double refraction? (b) Explain briefly options axis and its characteristics. (c) Discuss the construction of a nicol prism.

[6+4+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) How are the dielectric materials classified? (b) Write short notes on “Porcelain”.

[10+6]

7. (a) Explain the various properties of paramagnetic materials. (b) Explain why the paramagnetic materials does not show Meissner effect. (c) Mention the salient feature of the ferro-magnetic materials. 1 of 2

[6+4+6]

Set No. 2

Code No: RR10103 8. (a) What is meant by structural materials?

(b) Why the material has to withstand high and low temperature for space application? (c) Discuss some of the materials used for space applications along with their properties. [4+6+6] ⋆⋆⋆⋆⋆

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Set No. 3

Code No: RR10103

I B.Tech Supplementary Examinations, Apr/May 2006 ENGINEERING PHYSICS ( Common to Civil Engineering, Mechanical Engineering, Chemical Engineering, Mechatronics, Metallurgy & Material Technology and Production Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Discuss the theory of Newton’s rings with relevant diagram. (b) Calculate the thickness of air film at 10th dark ring in a Newton’s rings system viewed normally by a reflected light of wavelength 500 nm. The diameter of the 10th dark ring is 2 mm. [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) 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) Derive an expression for thermal conductivity of a metal by applying classical theory. (b) What is thermal analysis? Discuss any two techniques, you know, for thermal analysis. [8+8] 6. (a) What is dielectric polarization? Describe the major types of polarization which occur in dielectrics. (b) An atom of a gas on being polarized produces a dipole moment of 0.8 × 10−22 C − m. If the distance of the centre of negative charge cloud from the nucleus be [12+4] 6x10−15 cm, find the polarizability of the atom. 7. (a) What are the characteristics of soft magnetic materials? (b) What is ferro-magnetic curie temperature? Discuss the behaviour of a ferromagnetic material below the curie temperature. 1 of 2

Set No. 3

Code No: RR10103

(c) The magnetic field in the interior of a certain solenoid has the value of 6.5 × 10−4 T when the solenoid is empty. When it is filled with iron, the field becomes 1.4 T. Find the relative permeability of iron. [6+6+4] 8. (a) What is meant by dislocation? (b) Explain the role of dislocation in the strength of crystals. (c) Explain the mechanism of creep in materials. ⋆⋆⋆⋆⋆

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[4+6+6]

Set No. 4

Code No: RR10103

I B.Tech Supplementary Examinations, Apr/May 2006 ENGINEERING PHYSICS ( Common to Civil Engineering, Mechanical Engineering, Chemical Engineering, Mechatronics, Metallurgy & Material Technology and Production Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Explain the principle of superposition of waves. (b) Explain the phenomenon of interference. (c) With relevant diagram explain Young’s experiment on the basis of wave theory. [5+5+6] 2. (a) Write the expression for resolving power of a telescope. (b) Explain how resolving power can be improved? (c) Calculate the linear separation between two points at a distance of 10 km from a telescope objective of width 0.5 m if the wavelength of light used is 600 nm. [8+4+4] 3. (a) Explain the different methods by which ultrasonics can be generated. (b) Discuss the important physical properties of ultrasonic waves. (c) The velocity of ultrasonic beam in a medium is 350 m/sec. If the frequency is 5 MHz, find wavelength of the beam. [8+4+4] 4. (a) What are the important features of optical fibers? (b) Describe the communication process using optical fibers. (c) Give the uses of fiber optics in different fields.

[6+4+6]

5. (a) Explain thermal expansion of solids using the curve of potential energy versus interatomic distance. (b) Derive an expression for thermal conductivity of a solid by applying classical theory. [8+8] 6. (a) How are the dielectric materials classified? (b) Write short notes on “Porcelain”.

[10+6]

7. (a) Explain superconducting phenomenon. Distinguish Type I and Type II superconductors. (b) Discuss various applications of superconductors. 8. (a) Why is the airborne pressure vessels are required in aerospace?

1 of 2

[10+6]

Set No. 4

Code No: RR10103

(b) Explain the various properties of the materials used for airborne vessels along with their salient feature. (c) Why is the magnesium alloy is not used for the airborne vessels? [6+8+2] ⋆⋆⋆⋆⋆

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