Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU)) B-Tech 1st Semester (First Semester) 2015-2016 EAS 101 Engineering Physics I Question Paper
(Following Paper ID and Roll N o. to be ?lled in your
Answer Book)
Roll No.
B. Tech.
(SEM. 1) TH EORY EXAMINATION,2015-16
. ENGINEERING PHYSICS-I
[Time : 3 hours] ?. [Total Marks : 100]
SECTION-A
1. Attempt all parts . All parts carry equal marks. Write
answer of each part in short . (2x10=20)
(a) Is earth an inertial frame ? Explain.
(b) What is signi?cance ofmass energy relation ?
(0) Two independent sources cannot produce
interference. Why ?
(d) What happen when young doubel slit experiment
immersed in water ?
(e) What will be the effect on the intensity of principal
maxima of diffraction pattern when single slit is
replaced by double slit ?
4500 ( 1) P.T.O.
Attempt any ?ve questions from this section.
2.
4500
(f) What is the difference between plan polarized and
partially plane polarized light?
(g) What is optical pumping ?
(b) What is principle oflaser 7
(i) What is acceptance cone in optical ?bre ?
0) Give at least two applications of holography in
medical ?eld.
SECTION-B
(10x5=50)
Derive the exPression for time dilation. Show that it is a
real effect.
Deduce an expression for variation of mass with
velocity. At what speed the mass of an object becomes
? 2.25 times its rest mass.
Discuss the formation of interference fringes due to a
wedge shape thin ?lm seen by normally re?ected sodium
light. In Newton?s ring experiment the diameter of 4??
and 12?" dark ring are 0.400 cm and 0.700 cm
respectively. Deduce the diameter of 20"I ring.
Obtain intensity expression for single slit Fraunhofer
diffraction pattem.Light of wavelength 5500A falls
normally on a slit of width 22.0>< 10'5 cm. Calculate the
(2) Euss-lol
Attempt any two questions from this section.
10.
11.
4500 .
angular position of two minima on either side of central
maxima. ?
Discuss construction and working of half shade
polarimeter.
Discuss Einstein?s cof?cient. Find the relation between
them.
What do you mean by attenuation in optical ?bre.
Discuss different types of losses in optical ?bre.
Describe the process of construction and reconstruction
of image on hologram. Also describe application of
holography.
SECTION?C
(1 5x2=3 0)
(a) Show that space time or interval between two
events remains invariant under Lorentz
transformation.
(b) Show the effect of introducing thin mica sheet in
' the path of one of interfering beam in young?s
double slit experiment.
(0) Find the mass and speed of election with energy
of 2 MeV.
(a) Explain the formation of spectrum by plane
diffraction grating.
(3) P.T.O.
12.
4500
(b)
(C)
(b)
(C)
Explain how wavelength of sodium light can be
calculated from Fresnel biprisim experiment.
If- the population ratio between two energy states
in Ruby laser is 2><10'4?, emitting a light beam of
wavelength 6943A. Find the temperature of energy
states.
Discuss the difference between single mode ?bre
and multimode ?bre.
Explain construction and working of Nicol prism.
A step index ?bre has core refractive index 1.466,
cladding refractive indes 1.460, compute the
maximum radius allowed; if ?bre support only one
mode by using wavelength of 5000A.
Physical Constants :
Mass of electron, m0 = 9.1 x 10?"1 kg
Mass of proton, m9 = 1.67 x 10?27 kg
Speed of light, c = 3 x 108 m/s
Planck?s constant, h = 6.63 x 10"? J/s
Charge on electron, e = _l .6 x 10?19 C
Boltzmann?s constant = 1.38 x 10?231n2kgs?2K?l
._x__
(4) EAS-lOl
This post was last modified on 29 January 2020