UEET101Introduction UEET101Introduction to Nanotechnology Nanotechnology FINAL EXAM SAMPLE QUESTIONS NANO MECHANICS by Dr. Pradip Majumdar
1.
What is the length length scale used in nanotechnol nanotechnology? ogy?
A. Size of the order of 10
9
B. Size of the order of 10
8
C. Size of the order of 10
7
m m m
2. Under what condition the continuum model breaks down. A. When volume is so small that that mass is not uniformly distributed. distributed. B. When volume is so small small that mass is uniformly distributed. distributed.
C. When volume volume is less than than 1.0
10
3
cm
3
.
3.
Macroscopic view of properties. A. Consider behavior of individual individual molecules. B. Consider behavior of all molecules as identical. identical. C. Consider gross or average behavior behavior of a number of molecules: molecules:
4.
Nanotechnology rests on the technology that involves devices and systems: A less than 200 nm. B. Less than 100 nm. C less than 1000 nm. .
5.
Define Define ene energy rgy carrie carrierr phon phonon. on. A. It is the energy energy carrier for macro-scale mechanism B. It is the quantized lattice vibration energy. C. It is the the quantized electromagnetic energy. energy.
6. What is is the definition definition of of mean free path path length length of a heat heat carrier? carrier? A. Size of the heat carrier B. Characteristic dimension dimension of the the device. C. Average distance traveled by the heat carrier before successive collisions. 7.
What is the the operatin operating g definiti definition on of relaxation relaxation time? A. Average time traveled by particles particles between successive successive collisions with other other particles. Time for the duration of a process. Settling time of a particle
8.
What Wh at is a car carbo bon n nan nanot otub ube? e?
B. C.
A. Circular tube made of graphite B. Nanotubes are hollow cylinders made up of carbon atoms. C.. Nanotubes are made of carbon sheet 9. What is a nanofluid? A. Nanofuids are fluids in nanosize device B. Nanofluids are mixture of different fluids C. Nanofluids are fluids with suspensions of solid nano-particles it. 10
Carbon nanotubes are stronger than steel. A. Carbon nanotubes are 100 times stronger than steel at one-sixth of the weight. B. Carbon nanotubes are 10 times stronger than steel at one-sixth of the weight. C. Carbon nanotubes are 1000 times stronger than steel at one-sixth of the weight.
11. Carbon nanotubes have the ability to sustain temperature as high as: A. 800 C B. 2000 C C. 3000 C 12. Single Walled Carbon Nano-Tubes (SWCNT) are: A. excellent conductors B. Poor conductor C. Poor conductor than MWCNT 13. Nanofluid thermal conductivity is increase by a factor of 20-30% by adding: A. 10-15 % of nanoparticles B. 20-30% of nanoparticles C. (3-4%) of nanoparticles 14. Piezoelectric Effect involves A. Generating electrical voltage B. Generating mechanically stress C. Generating vibration 15. Gravity plays: A. Plays a strong role in nanoscale B. Do not play a strong role in nanoscale C. Is as important as other forces in nanoscale 16. Seebeck Effect involves: A. Generating voltage based on temperature difference B. Generating voltage based on pressure difference C. Generating voltage based on stress difference 17. Human body generates energy of the order of:
A. 1 KW B. 50 W C. 1 mW 18. Zinc Oxide is: A. A good conductor B. has only good piezoelectric property C. has good piezoelectric and semiconductor properties 19. Nanostructured materials are formed by: A. Creating increased surface area per unit volume. B. Creating decreased surface area per unit volume C. Keeping same surface area per unit volume 0.
Nanopartcle properties are: A. May be same as in bulk material B. Little bit different form bulk material properties. C. Significantly different form bulk material properties
21. Elastic Deformation: A. Material do not resumes back to the original dimension
B. Material resumes back to the original dimension C. Material resumes back partially to the original dimension D. None of the above 22. Engineering Strain: A. It is defined as the ratio of the dimensional change to the original dimension. B. It is defined as the ratio to the original dimension to the dimensional change C. It is defined as the ratio of the fraction of the dimensional change to the original dimension. D. None of the above
23. Shear Strain:
A. This is the deformation of a material caused by a normal force. B. This is the deformation of a material caused by a tangential force. C. This is the deformation of a material caused by combined tangential and normal forces. D. This is the deformation of a material caused by the total force on a body. 24. Stress: A: It is the ratio of area and the force that acts on the area. B. It is the force that acts on the area. C. It is the ratio of force and the area over which the force acts D. None of the above 25. Elastic modulus:
A. It is a measure of the stiffness of the engineering material B. It is a measure of the tensile strength of the engineering material C. It is a measure of the compression strength of the engineering material D. None of the above 26. In some applications, we need material of high modulus of elasticity rather than high Strength:
A.
False
B.
True
C.
Partially true
D.
None of the above
27.Higher the modulus of elasticity lower is the deformation:
A.
False
B.
True for same cases
C.
True
D.
None of the above 28. Identify the material that under goes the most deflection:
A. Titanium B. Aluminum C. Steel D. Titanium alloy 29.Thresholds of Micromechanics is given by the scale: A.
10
B.
10
C.
10
D.
10
9
3
8
6
m
m
m
m
30. Tensile Young’s modulus of SWNT
A. Greater than C-fiber P100 by 1.6 times B. Lower than C-fiber P100 by 1.6 times C. Greater than C-fiber P100 by 2.8 times D. Lower than C-fiber P100 by 2,8 times 31. Density of SWNT:
A.Greater than C-fiber by about 1.6 times B. Lower than C-fiber by about 50 % times C. Same as for C-fiber D. Greater than C-fiber by about 2.0 times 32. Conduction Heat Transfer is primarily important in solid and stationary fluid:
A. False B. For some materials C. True D. None of the above
33. Higher thermal conductivity is for :
A. Gold B. Aluminum C. Copper D. Diamond 34. Higher thermal conductivity is for:
A. Solid B. Gases C. Liquid D. Mixture of gasses 35. The dominant mechanism of conduction heat transfer in dielectric crystalline solid is by:
A. Phonon – electron interaction B. Motion of free electrons C. Phonon-phonon interactions D. Electron-electron interactions 36. The dominant mechanism of conduction heat transfer in pure metal:
A. Phonon – electron interaction B. Motion of free electrons C. Phonon-phonon interactions D. Electron-electron interactions 37. Thermal conductivity enhancement for nano-fluid reported to be greater than the base fluid:
A. 20-30% B. 10-20 % C. 30-40% D. 40-50 %
38. Typical composition of nano particles in nano-fluids:
A. 10-20 % B. 3-4% C. 8-10% D. 20-30% 39. Critical heat flux for boiling in nanofluid is increased by:
A. 100% B. 150% C. 200% D. 300% 40. Surface area per unit volume for nanoparticles is:
A. Same as macro-size particles B. Higher than macro-sized particles C. Lower than macro-sized particles D. None of the above
NANO PHYSICS by Dr. Omar Chmaissem
1.
A discrete spectrum is one that a. has continuous wavelengths. b. yields a line spectrum c. only has wavelengths longer than the visible. d. only has wavelengths in the visible.
2.
The Balmer series in hydrogen a. has four lines in the visible. b. has four lines in the ultraviolet. c. includes the Paschen series. d. includes both the Paschen series and the Lyman series.
3.
Bohr's quantum condition was
a. electron orbits are stationary states. b. energy is exchanged when changing state. c. a photon is emitted as a quantum of energy. d. angular momentum is quantized. 4.
The Bohr radius of the hydrogen atom is 0.529 x 10 -10 m. The radius of the n = 2 state is a. also 0.529 x 10 -10 m b. 1.06 x 10-10 m c. 2.12 x 10-10 m d. 0.265 x 10-10 m
5.
The energy of the ground state in the Bohr model is -13.6 eV. The energy of the n = 2 is a. -13.6 eV b. -6.8 eV c. -4.5 eV d. -3.4 eV
6.
The energy of the ground state in the Bohr model is -13.6 eV. In a transition from the n = 2 state to the n = 4 state, a photon of energy a. 3.40 eV is absorbed. b. 0.85 eV is emitted. c. 2.55 eV is absorbed d. 2.55 eV is emitted.
7.
If the hydrogen atom is in the n = 4 state, what is the largest number of photons that can be emitted as the atom goes back to the ground state? a. 1 b. 2 c. 3 d. 4
8.
The more precisely the position of an object is measured, the more the uncertainty in its a. momentum. b. energy. c. speed. d. temperature.
9.
An electron is measured to have a momentum of 2.0 x 10 -24 kg.m/s with an uncertainty of 2.0 x 10-27 kg.m/s. What is the limit of precision in a simultaneous position measurement? a. 3.3 x 10-7 m b. 5.3 x 10-8 m c. 1.7 x 10-9 m d. 1.0 x 10-3 m
10.
Which of the following is not an electromagnetic wave? a. visible light. b. x-rays. c. microwaves. d. sound waves.
11.
Bohr’s principle of complementarity means that physical observables: a. can be simultaneously described in terms of both particles and waves. b. cannot be simultaneously described in terms of both particles and waves. c. are impossible to measure without advanced instruments. d. none of the above.
12.
According to the uncertainty principle, precisely measured energy distrurbs: a. time. b. position. c. momentum. d. acceleration.
13.
Consider the region of space that you are occupying. Which of the following types of electromagnetic waves are present around you? a. radio waves. b. microwaves. c. infrared waves. d. all of the above.
14.
A special camera has been designed that opens and closes its shutter for a very short time. A picture of an illuminated object is taken with this camera. When the film is developed, only tiny, bright dots appear randomly distributed on the picture. What does this experiment tell us about the nature of light? a. The dots are an interference pattern, which proves the wave nature of light. b. The small number of dots indicates that light waves were cut off by the shutter as it closed. c. The camera lens could not focus the light waves at a point on the film with such a short time. d. The random distribution of dots shows the particle nature of light.
15.
In an ideally dark room, a double-slit experiment is carried out using a source that releases one photon at a time at a slow rate. The observation screen in the experiment is replaced with photographic film which provides a recording o f the photons striking it over time. After some time has passed, the film is removed and developed into a photograph. What is observed on the photograph? a. two bright bands that correspond to the two slits. b. an interference pattern. c. a single bright band. d. It’s impossible to guess.
16.
A beam of electrons is directed at two narrow slits and the resulting pattern is observed on a screen that produces a flash whenever an electron strikes it. What is the most surprising observation that is made in this experimental apparatus? a. The electrons do not all strike the screen at the same location. b. The pattern on the screen is an interference pattern. c. The shadow of the two slits is observed on the screen. d. The electrons produce the same pattern on the screen with or without the slits in place.
17.
What is the de Broglie wavelength of a particle, such as an electron, at rest? a. The wavelength would be zero meters. b. The wavelength would be infinitely small and not measurable. c. This has no meaning. The de Broglie wavelength only applies to moving particles. d. Davisson and Germer measured this wavelength in their apparatus and found it to be around 10-10 m.
18.
In the Bohr model, what is the angular momentum of the electron in the ground state of the hydrogen atom? a. zero b. h c. h/π d. ħ
19.
What is the name given to the particle-like entities that compose electromagnetic waves? a. phonons. b. photons. c. mesons. d. electromagnons.
20.
What is the term used for the minimum work needed to eject an electron from a metal surface? a. photoelectric function. b. photon energy. c. work function. d. Fermi energy.
21.
Which one of the following scientists made the suggestion that since light waves can exhibit particle-like properties, that particles should exhibit wave-like properties? a. de Broglie b. Planck c. Heisenberg d. Einstein
22.
What is barrier tunneling? a. This occurs when photons pass through a solid barrier. b. This occurs when particles make a hole through a solid barrier.
c. This occurs when photons make a hole through a energy barrier. d. This occurs when particles pass through an energy barrier. 23.
What is the term used for the lowest energy level of an atom? a. ionization energy b. nucleation energy c. ground state d. work function
24.
Which one of the following choice is an assumption Bohr made in formulating his atomic model? a. The linear momentum of the electron is quantized. b. The angular momentum of the electron is quantized. c. The ground state energy of the hydrogen atom is −13.60 eV. d. Electrons may be found anywhere in the atom.
25.
The Bohr model successfully predicted which one of the following parameters? a. The values of the energy levels of the hydrogen atom. b. The size of an electron. c. The electric potential of an electron. d. The number of neutrons in a given atom.
NANO ENGINEERING by Dr. Michael Haji-Sheikh
1. The American Society of Mechanical Engineering was founded in the 19'th Century to improve what? a) Train brakes. b) Ship propellers. c) Steam boilers. d) Light bulbs. 2. Electrical Engineering changed during World War II due to the advent of what device? a) Light bulb. b) Radar. c) Memristor. d) Walkie talkie. 3. Civil Engineers function by working with? a) Circuits, instrumentation and communication. b) Physical properties of materials and how they interact with systems. c) Bridges, sewage systems, buildings and roads. 4. The cell phone is the combination of what two devices? a) The transistor and the resistor. b) The computer and the modem. c) The Walkie Talkie and the phone.
5. What invention made in 1947 changed our modern world? a) Walkie talkie. b) Steam boiler tables. c) Train brakes. d) Transistor. 6. A system engineer is responsible for a) Circuits, instrumentation and communication. b) Physical properties of materials and how they interact with systems. c) Bridges, sewage systems and roads. d) System efficiency and inventory management along with human factors. 7. The S. Jack Kilby won the Nobel Prize for the invention of what? a) The integrated circuit. b) The transistor. c) Memristor. d) Radar. 8. The screw propeller came from Brunel applying what to the propulsion of a ship. a) Bornoulli's principle. b) Archimedes pump. c) Fermi statistics. 9. Mechanical Engineers specialize in analyzing what. a) Circuits, instrumentation and communication. b) Physical properties of materials and how they interact with systems. c) Bridges, sewage systems and roads. d) System efficiency and inventory management. 10. The dielectric constant is the measure of the ability of a material to store energy. In the nanoporous sensor we tabulated the effect of different materials. Which material has the highest dielectric constant? a) IPA b) H2O c) Xylene 11. A Electrical Engineer is responsible for a) Circuits, instrumentation and communication systems. b) Physical properties of materials and how they interact with systems. c) Bridges, sewage systems and roads. d) System efficiency and inventory management along with human factors. 12. We used the nanoporous capacitor to demonstrate the interaction of what? a) Mechanical, Electrical and Chemical processes. b) Electrical, civil and physics.
c) How fires can be started. 13. In the presentation, why did the capacitance change? a) The film expanded. b) The electrodes shorted out. c) The vapors in the air condensed in the pores. 14. The David Goodsell slide shows what? a) The genome of cats. b) Parts of the cell and what systems they represent. c) Parts of the cell that make up the plant. 15. What image represents a motor? a) The Flagella. b) The inner cell wall. c) Mitochondria. 16. What biostructure represents packaging? a) Actin filiment. b) Myelin. c) Rhinovirus.
ETHICS CODEOF ETHICS FOR ENGINEERS Answer as True or False:1) Engineers shall hold paramount the safety, health, and welfare of the public (True/False) 2) Engineers shall perform services only in the areas of their competence (True/False) 3) Engineers shall issue public statements only in an objective and truthful manner (True/False) 4) Engineers should not disclose all known or potential conflicts of interest that could influence or appear to influence their judgment or the quality of their services. (True/False) 5) Engineers in public service as members, advisors, or employees of a governmental or quasigovernmental body or department shall not participate in decisions with respect to services solicited or provided by them or their organizations in private or public engineering practice. (True/False) 6) Engineers shall not solicit or accept a contract from a governmental body on which a principal or officer of their organization serves as a member (True/False) 7) Engineers shall advise their clients or employers when they believe a project will not be successful (True/False) 8) Engineers shall not be influenced in their professional duties by conflicting interests. (True/False) 9) Engineers in private practice shall not review the work of another engineer for the same client, except with the knowledge of such engineer, or unless the connection of such engineer with the work has been terminated (True/False) 10) Engineers in governmental, industrial, or educational employ are entitled to review and evaluate the work of other engineers when so required by their employment duties. (True/False) 11) Engineers in sales or industrial employ are entitled to make engineering comparisons of represented products with products of other suppliers. (True/False) 12) Engineers shall continue their professional development throughout their careers and should keep current in their specialty fields by engaging in professional practice, participating in
continuing education courses, reading in the technical literature, and attending professional meetings and seminars (True/False)
1.
By definition atleast one of the three dimensions should be in the range of
2.
Nanoparticles behave differently from bulk materials no because of
Decrease in volume,
Increase in surface area
Most of the molecule present in the bulk of nanoparticle.
Surface molecules have very high energy due to imperfect crystal structures.
3.
"There is a plenty of room at the bottom." This was stated by A. Issac Newton B. Albert Einstein C. Richard Feynman D. Eric Drexler
4.
5.
1 nanometre= _______ cm.
A.
10(-9)
B.
10(-8)
C.
10(-7)
D.
10(-6)
The size of E.coli bacteria is ______ nm A.
75000
B.
2000
C.
200
D.
5
6.
7.
The diameter of human hair is _______ m A.
75000
B.
75
C.
7.5 x 10(-5)
D.
7.5 x 10(-9)
The most important property of nanomaterials is A.
force
B.
friction
C.
pressure
D. temperature
8.
9.
The diameter of a bucky ball is about ______
A.
1 Ao
B.
100 Ao
C.
1 nm
D.
10 nm
A bucky ball is a molecule consisting of ___ carbon atoms A.
50
B.
60
C.
75
D.
100
10. The cut-off limit of human eye to see is _____ nm A.
10
B.
100
C.
1000
D.
10000
11. 1 meter = ______ nm.
A.
109
B.
10(-9)
C.
1010
D.
10(-10)
12. The diameter of hydrogen atom is ______ nm. A.
10
B.
1
C.
0.1
D.
0.01
13. The size of a quantum dot is ______ m. A.
5
B.
5 x 10(-9)
C.
5 x 10(-10)
D.
5 x 10(-11)
14. 20 micron = ______ nm
A.
20 x 10(-9)
B.
20 x 109
C.
200
D.
20000
15. The hardest material found in nature is ______. A.
steel
B.
topaz
C.
diamond
D.
quartz
16. ______ are the extentions of bucky balls. A. Geodesic domes B.
Hexagons
C. Carbon nanotubes D.
AFM and STM
17. Nanotechnology, in other words, is A. Carbon engineering B. Atomic engineering C. Small technology D. Microphysics 18. The width of carbon nanotube is ______nm. A.
1
B.
1.3
C.
1.55
D.
10
19. The diameter of fly ash particles is _____ μm A.
5-10
B.
10-20
C.
20-30
D.
100
20. The tensile strength of a carbon nanotube is _____ times that of steel. A.
10
B.
25
C.
100
D.
1000
21. The ratio of thermal conductivity of silver to that of a carbon nanotube is _____. A.
100 : 1
B.
1 : 100
C.
10 : 1
D.
1 : 10
22. In a bucky ball, each carbon atom is bound to _____ adjacent carbon atoms. A.
1
B.
2
C.
3
D.
4
23. The size of red and white blood cells is in the range of _____μm.
A.2-5 B.
5-7
C.
7-10
D.
10-15
A graphene sheet differs from the framework of a fullerene because: the graphene sheet consists of C rings in which =5 the graphene sheet consists of C rings in which 5 n
n
= 5 and 6, but in a fullerene n
n
n
= 6, but in some fullerenes
n
=
the graphene sheet consists of C rings in which 6 the graphene sheet consists of C rings in which n = 6 n
n
= 6, but in fullerenes
n
n
= 5 or 6, but in most fullerenes
n
= 5 and
24.
Nanotubes usually form in bundles. Which is the best description of such a bundle? The tubes are connected together by covalent C-C bonds The tubes are randomly organized, with the axes of the tubes lying in random directions The tubes are aligned, axes parallel, with van der Waals forces operating between adjacent tubes The bundles are of discrete sizes, and dipole-dipole forces hold the tubes together
