B.TechSemester 12021-22Engineering PhysicsKAS-101T
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Engineering Physics (KAS-101T) - AKTU Question Paper 2021-22

B.Tech · Semester 1 · Free PDF Download

This is the official AKTU Engineering Physics Previous Year Question Paper for B.Tech Semester 1, academic session 2021-22. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.

Course:B.Tech
Semester:Semester 1
Session:2021-22
University:AKTU / UPTU

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Questions Asked in 2021-22

Engineering Physics (KAS-101T) — complete question paper

Section AAttempt all questions in brief.
  • a
    State Einstein’s postulates of Special Theory of Relativity. 2 1
  • b
    Find the momentum of a photon having energy 1.00 × 10-17 J. 2 1
  • c
    What is Displacement Current? 2 2
  • d
    Show that magnetic mon opoles do not exist. 2 2
  • e
    State Wien’s displacement law and Rayleigh-Jeans law. 2 3
  • f
    Why are matter waves associated w ith a particle generated only when it is in motion?
  • g
    Two independent sources of light cannot produce interference, why? 2 4
  • h
    State Rayleigh criterion of Res olution. Also define resolving power. 2 4 i. Differentiate between spontan eous and stimulated emission. 2 5 j. With the help of a well-labelled diagram, name the components of an optical fibre
Section BAttempt any three o f t h e f o l l o w i n g :
  • a
    Show that space-time interval between two events remains inv ariant under Lorentz transformations
  • b
    Find the conduction current de nsity and displacement current density for
  • a
    solid with conductivity, σ = 10 -3 S / m a n d εr = 2.5. Electric field intensity, E = 4.5×10-6 sin (109t)
  • c
    Find the two lowest permissible energy states for an electro n which is confined in a one dimensional infinite potential box of width 3.5×10-9m
  • d
    Calculate the thickness of a soap bubble thin film that will result in constructive interference in reflected light. The film is illuminated with light of wavelength 5000 Å and the refractive index of the film is 1.45
  • e
    What do you understand by attenuation and dispersion in an o ptical fibre. A communication system u ses a 25 km long fibre having a loss of 2.5 dB/km. The input power is 2500 µW, compute the output power
Section CAttempt any one p a r t o f t h e f o l l o w i n g :
  • a
    What do you mean by time dila tion? Explain with the help of a mathematical proof. Justify with an experimental evidence to sh ow that time dilation is a real effect. 10 1 AKTU_ AKTU_
  • b
    Derive Einstein’s mass-energy relation and show that relati vistic kinetic energy of a particle is given by: vcmcmmk
  • a
    Write Maxwell’s equations in free space. Also show that the electric and magnetic vectors are normal to the direction of propagation of the electromagnetic wave
  • b
    State and deduce Poynting theorem for the flow of energy in an electromagnetic field. Discuss the physical significance of Poy nting theorem
  • a
    What is wave function? Derive time independent Schrodinger w ave equation
  • b
    What is Compton effect? Derive an expression for Compton shift. 10 3
  • a
    Describe the formation of Newton’s rings in monochromatic li ght. Show that in reflected light, the diam eters of dark rings are propor tional to the square roots of natural numbers
  • b
    What is a diffraction grating? Discuss the phenomenon of diffraction due to plane diffraction grating
  • a
    Illustrate the construction and working of He-Ne laser? Disc uss important applications of laser
  • b
    Derive expressions for acceptance angle and numerical apertu re. 10 5

Question text is extracted from the official AKTU question paper PDF above. Hindi translations are omitted — every question is printed in English in the original paper. Last verified: 2026-08-23.

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