Name of the College : SREE CHAITANYA COLLEGE OF ENGINEERING
University : JNTUH
Subject Name : ENGINEERING PHYSICS
Year : I
Website : scce.ac.in
Document Type : Model Question Paper
Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/scce.ac.in/4896-09A1BS02-ENGINEERINGPHYSICS.pdf
Engineering Physics Question Paper :
I B.Tech Examinations,December-January, 2011-2012
Common to CE, ME, CHEM, BME, IT, MECT, MEP, AE, BT, AME, ICE, E.COMP.E, MMT, ETM, EIE, CSE, ECE, EEE, MIM, MIE
Related : Sree Chaitanya College Of Engineering 09A1BS03 Engineering Chemistry B.Tech Question Paper : www.pdfquestion.in/4894.html
Time: 3 hours
Max Marks: 75
Answer any FIVE Questions :
All Questions carry equal marks :
1. (a) What are single mode, multimode and graded index fibres? Explain.
(b) Derive an expression for numerical aperture of an optical fibre.
(c) What is a displacement sensor? Draw its sensitivity curve. [6+5+4]
2. (a) What is space lattice? Calculate the packing fraction for BCC and FCC crystals.
(b) Describe, in detail, the structure of CsCl crystal.
(c) If the cube edge of diamond is 0.36 nm, calculate the number of atoms per unit volume. [6+5+4]
3. (a) Explain the terms:
i. Magnetic induction,
ii. Magnetic susceptibility,
iii. Permeability and
iv. Intensity of magnetization.
(b) Explain the domain theory of ferromagnetism.
(c) For a paramagnetic material the susceptibility at 340 K is 1.76 10.4. Calculate its susceptibility at 310 K. [6+6+3]
4. (a) What is Bloch theorem? Explain.
(b) On the basis of band theory how the crystalline solids are classified into conductors, semiconductors and insulators?
(c) For an electron under motion in a periodic potential, plot the curve between the effective mass of the electron and wave number, and explain. [5+5+5]
5. (a) Explain the concept of dual nature of the light.
(b) What are the important conclusions of G.P.Thomson experiment?
(c) Derive the Schrodinger’s wave equation for the motion of an electron.[4+4+7]
6. (a) What is Bragg’s law of X-ray diraction? Explain.
(b) Describe, in detail, powder method to determine the crystal structure.
(c) When a monochromatic X-ray beam of X-rays of wavelength 0.1542 nm is used, the first order reflection from (1 1 1) planes occurs at . If the lattice parameter is 0.433 nm, find the value [4+7+4]
7. (a) Derive an expression for carrier concentration of p-type semiconductors.
(b) Explain the variation of Fermi level with
i. Donor concentration and
ii. Acceptor concentration, in the case of extrinsic semiconductors.
(c) Calculate the intrinsic carrier concentration for Ge at 270C. [for Ge, Atomic weight = 72.6, Density = 5400 kg/m3, Band gap = 0.7 eV]. [7+4+4]
8. (a) Define the term `reverberation’? What is reverberation time?
(b) Describe any two methods by which the sound absorption coeffcient of a material can be determined.
(c) A hall of volume 85000 m3 is found to have a reverberation time of 2.2 sec. If the area of the sound absorbing surface is 7500 m2, calculate the average sound absorption coecient. [4+7+4]
Code No: 09A1BS02
R09 Set No. 4
1. (a) Derive the Schrodinger’s wave equation for the motion of an electron.
(b) Write the physical significance of wave function.
(c) A body has a mass of 0.55 gm and moves with a velocity 3.50 105 cm/s. What is the de Broglie wavelength associated with it. [7+4+4]
2. (a) Define the terms:
i. Magnetizing field,
ii. Intensity of magnetization,
iii. Magnetic susceptibility and
iv. Magnetic induction.
(b) Explain the origin of spontaneous magnetization in ferro-magnets on the basis of spin-spin interaction. Explain magnetization curve on the basis of domain movement. [6+9]
3. (a) Derive Bragg’s law of crystal diraction.
(b) Describe, in detail, Debye-Scherrer method for the determination of crystal parameter.
(c) A certain crystal reflects monochromatic X-rays strongly when Bragg’s angle is 210 for the second order diffraction. Calculate the glancing angle for third order spectrum. [4+7+4]
4. (a) Show that the Kronig-Penney model leads to energy band structure in solids.
(b) For an electron under motion in a periodic potential, plot the curve between the effective mass of the electron and wave number, and explain. [9+6]
5. (a) Draw the energy band diagram of
i. An intrinsic,
ii. n-type and
iii. p-type semiconductors. Indicate Fermi, donor and acceptor levels, wher- ever present.
(b) What is Hall eect and its importance? Derive a relation between Hall voltage and Hall coecient.