Engineering Physics (KAS201T) - AKTU Question Paper 2021-22
B.Tech · Semester 2 · Free PDF Download
This is the official AKTU Engineering Physics Previous Year Question Paper for B.Tech Semester 2, 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 2
Session:2021-22
University:AKTU / UPTU
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Questions Asked in 2021-22
Engineering Physics (KAS201T) — complete question paper
Section AAttempt All of the following Questions in brief Marks(10X2=20) CO
- aWhat is frame of reference in motion? 1
- bShow that massless particles can exist only if the they move with the speed of light and their energy E and momentum p must have the relation E= pc
- cIn an electromagnetic wave, the electric and magnetic fields are 100V/m and 0.265A/m. What is the maximum energy flow
- dDefine the concept of Skin depth for high and low frequency waveforms. 2
- eWhat is Compton effect and Compton shift? 3
- fWhy is black the best emitter? 3
- gWhy the center of Newton’s ring in reflected system is dark? 4
- hExplain Rayleigh’s criterion of resolution. 4 Q1(i) What do you mean by acceptance angle and cone for an optical fiber? 5 Q1(j) Differentiate spontaneous emission and stimulated emission. 5
Section BAttempt ANY THREE of the following Questions Marks(3X10=30) CO
- aWhat is special theory of relativity? Derive Lorentz transformation equation. 1
- bAssuming that all the energy from a 1000 watt lamp is radiated uniformly; calculate the average values of the intensities of electric and magnetic fields of radiation at a distance of 2m from lamp
- cCalculate the energy difference between the ground state and the first excited state for an electron in a one-dimensional rigid box of length 25Å
- dNewton’s rings are observed in reflected light of wavelength 5900A0. The diameter of 10th dark ring is 0.50cm. Find the radius of curvature of the lens
- eA step index fibre has μ1 =1.466 and μ2 = 1.46 where μ1 and μ2 are refractive indices of core and cladding respectively. If the operating wavelength of the rays is 0.85 μm and the diameter of the core = 50 μm, calculate the cut-off parameter and the number of modes which the fibre will support
Section CAttempt ANY ONE following Question Marks (1X10=10) CO
- aWhat was the object of conducting Michelson-Morley experiment? Illustrate the experiment with proper diagram and necessary mathematical deriv ations. Also state the outcomes
- bDeduce Einstein’s mass –energy relation E= mc2. Give some evidence showing its validity
Section CAttempt ANY ONE following Question Marks (1X10=10) CO
- aDeduce the Maxwell’s equations for free space and prove that el ectromagnetic waves are transverse in nature
- bDefine radiation pressure and momentum of electromagnetic wave. Also determine an expression for radiation pressure and momentum
Section CAttempt ANY ONE following Question Marks (1X10=10) CO
- aWhat is the physical significance of a wave function? Derive Sc hrodinger time independent wave equation
- bWhat is Compton effect? Deduce an expression for Compton shift. 3
Section CAttempt ANY ONE following Question Marks (1X10=10) CO
- aWhat is Rayleigh criterion of resolution how one can increase the resolving power of
- adiffraction grating? Using Rayl eigh criterion for just resolu tion show that the resolving power of grating is equ al to nN, where n is the order of the spectrum, and N is total no of lines on the grating
- bDiscuss the phenomena of Fraunhofer diffraction at a single sli t and show that the relative intensities of the succes sive maximum are nearly 1: 4/ 9π2: 4/25π2: 4/49π2
Section CAttempt ANY ONE following Question Marks (1X10=10) CO
- aA silicon optical fibre with a core diameter large enough has a core refractive index of 1.50 and a cladding refractive index 1.47. Determine (i) the critical angle at the core cladding interface, (ii) the numerical aperture for the fibre (iii) the acceptance angle in air for the fibre
- bWhat do you mean by population inversion? Describe the pr inciple and working of Ruby laser system with the help of neat diagram
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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