Master of Science II (Physics Materials Science)
Examination: Oct Nov 2016 Semester IV (New CGPA)
SLR No. Day
Date Time Subject Name Paper
No. Seat No.
SLR SH
563
Thursday
24/11/2016
02.30 PM
to
05.00 PM
Nano Science
Nanotechnology
C
XVI
Instructions: Answer any five questions.
Q.1 and Q. 2 are compulsory
Attempt any three from Q.3 to Q.7
Use of nonprogrammable calculator is allowed
Total Marks:70
Q.1 Select the alternatives 14
What is bulky ball?
A carbon molecule
Nickname for Mercedes-Benz car
Plastic explosives nanoparticles
Concrete nanoparticles with high compressive strength
Fermi level for P-type semiconductor lies
At middle of the band gap Close to the conduction band
Close to the valence band Below valence band
Who was used the term Nanotechnology and when?
Richard Feynman 1959 Norio Taniguchi 1974
Eric Drexler 1986 Sumio lijima 1991
The wavelength corresponding to the energy 3.02 eV is
4100A0 410A0
41A0 4.1A0
What exactly is a quantum dot?
A semiconductor nanostructure that confines the motion of conduction
band electrons valence band holes, or excitons in all three spatial
directions
The sharpest possible tip of an atomic Force Microscope
A fictional term used in science fiction for the endpoints of wormholes
Unexplained spots that appear in electron microscopy images of
nanostructure smaller than 1 nanometer
Which method detects the surface features of the material?
Scanning electron microscopy Transmission electron microscopy
Atomic force microscopy Optical microscopy
Scanning tunneling microscopy image of atom is based on
Thickness of atom Mass of atom
Friction caused by ribbing the tip
on atom
Amount of tunneling current
Which colloid absorbs the highest energy of light
Red Blue
Black Green
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A microscope in which an image is formed by passing an electron beam
through a specimen and focusing the scattered electrons with magnetic lenses
is called a
Scanning electron microscopy Transmission electron microscopy
Atomic force microscopy Optical microscopy
10) Regions of a specimen with higher electron density scatter electrons
and, therefore appear in the image projected onto the screen of a
transmission electron microscope.
Phase-contrast
More, lighter More, darker
Fewer, lighter Fewer, darker
11) Intrinsic conduction normally occurs at temperature
Room temperature Low but elevated temperature
High but elevated temperature Both a and b
12) The carrier concentration in intrinsic semiconductor with increase
of temperature
Increase Decrease
Remains same None
13) Which of the following statement/s is are true?
Volume of surface ratio is very large of nanomaterials
The cut-off limit of human eye is 10-5m.
Hardness of a SWNT is about 63 x 109 Pa.
Carbon nanotubes are cylindrical fullerenes
14) Bremssstahlung consist of wavelength of radiation
Single Two
Triple Multiple
Q.2 Attempt the following
Write a note on molecular machine 05
What is single electron transistor 05
Write a note on quantum confinement effect and effective mass approximation 04
Q.3 What king of sample can be analyzed by AFM? What are the applications of
AFM?
10
Explain the interaction of electron with sample 04
Q.4 Explain various conduction mechanism in 3D, 2D and low dimensional
systems
10
Explain any two chemical methods for preparation of nanomaterials. 04
Q.5 Explain in detail the working of transmission electron microscope. 10
Write a note on nanobiometrics 04
Q.6 Give Bragg's Law. Sketch of a X-ray diffractometer showing x-ray source,
collimation, slits, system, sample, detector and the scattering angle to explain
the parameters in Bragg's Law.
08
Explain the working of field emission scanning electron microscope and give
its advantages over normal scanning electron microscope.
06
Q.7 Explain in detail principle and working of photoluminescence
spectrophotometer.
08
Give the detail working of single and double beam spectrometer. 06
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