GOVERNMENT ENGINEERING COLLEGE, BHARUCH
B.E. Sem-I (All Branches) Assignment
(PHYSICS)
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Explain the various factors affecting the acoustics of building and give their
remedies.
What is the resultant sound level when a 70dB sound is added to an 85dB sound?
Draw the circuit diagram of piezoelectric oscillator and explain the production of
ultrasonic waves using it.
Draw circuit diagram of oscillator (Pierce’s) and explain magnetostriction
method to produce ultrasonic waves.
Calculate the frequency at which piezoelectric oscillator circuit should be tuned
so that a piezoelectric crystal of thickness 0.1 cm vibrates in its fundamental
mode to generate ultrasonic waves. Given, Young’s modulus = 80GPA and
density of crystal material is 2654 kgm-3.
What is acoustic grating? Explain the acoustic grating method to determine the
velocity of ultrasonic waves in liquids
An ultrasonic source of 0.09 MHz sends down a pulse towards the seabed which
returns after 0.55 sec. The velocity of sound in water is 1800 m/s. Calculate the
depth of the sea and wavelength of pulse.
Describe the construction and working of Nd: YAG Laser with a suitable energy
level diagram.
Explain the characteristics of LASER.
Compare Type-I and Type-II superconductor
What is superconducting material? List the properties of superconducting
materials and explain in detail.
What is magnetic levitation? Explain in details with its applications.
What is noise pollution? Explain how to control noise in machines?
Give difference between antiferromagnetic & diamagnetic materials.
Explain ferrites material & list out its application.
Give difference between soft & hard magnetic material with its hysteresis graph
& give their application.
Explain reading & recording storage for magnetic material, & write a short note
on hard disk
A magnetic material has a magnetization of 1500 Am-1 & flux density 0.00212
Wb m-2 calculate relative permeability of the material.
A magnetic field of 1600 A m-1 produce magnetic flux of 2 × 10-5 weber at cross
sectional area 0.3 cm2 then calculate permeability.
What are dielectric materials? Distinguish between a dielectric material and
an insulator. What are the different types of dielectric materials? Explain
them in detail.
GOVERNMENT ENGINEERING COLLEGE, BHARUCH
B.E. Sem-I (All Branches) Assignment
(PHYSICS)
21 Derive caussis-mosotti equation for dia-electric material.
22 Define and describe ‘surface to volume ratio’ and ‘quantum confinement
effects’. For nano partial.
23 Explain ball milling & sol-gel method for synthesis of nano particles.
24 Explain with neat sketch carbon nanotubes giving its structure, properties
and applications.
25 Give any five applications of nanomaterials.
26 What a r e b io ma t e r i a ls ? Explain t h e di f f e r en t t y p e s o f bio ma t eri als
and thei r applications in the medical field.
27 What are Shape Memory Alloys? Explain pseudo elastic property for SMA.
28 What is shape memory alloy? Explain preparation method for SMA.
29 What is ultra-capacitor & fuel cell Give its application.
30 What is NDT? How ultrasonic waves are useful to detect flaw of material?
Note: you have to write this Assignment once.