end sem materials question

8/3/2019 End Sem Materials Question

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UEET101Introduction to Nanotechnology

FINAL EXAM SAMPLE QUESTIONS

NANO MECHANICS by Dr. Pradip Majumdar

1. What is the length scale used in nanotechnology?

A. Size of the order of m10 9

B. Size of the order of m10 8

C. Size of the order of m10 7

2. Under what condition the continuum model breaks down.

A. When volume is so small that mass is not uniformly distributed.

B. When volume is so small that mass is uniformly distributed.

C. When volume is less than 33cm100.1 .

3. Macroscopic view of properties.

A. Consider behavior of individual molecules.

B. Consider behavior of all molecules as identical.

C. Consider gross or average behavior of a number of 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 energy carrier phonon.

A. It is the energy carrier for macro-scale mechanism

B. Itis thequantized lattice vibration energy.

C. It is the quantized electromagnetic energy.

6. What is the definition of mean free path length of a heat carrier?

A. Size of the heat carrier

B. Characteristic dimension of the device.

C. Average distance traveled by the heat carrier before successive collisions.

7. What is the operating definition of relaxation time?A. Average time traveled by particles between successive collisions with other particles.

B. Time for the duration of a process.

C. Settling time of a particle

8. What is a carbon nanotube?


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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 deviceB. 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 nanoparticlesC. (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:


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A. 1 KW

B. 50 W

C. 1 mW

18. Zinc Oxide is:

A. A good conductorB. 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

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.


23. Shear Strain:


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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


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


26. In some applications, we need material of high modulus of elasticity rather than high

Strength:

A. False

B. True

C. Partially true


27.Higher the modulus of elasticity lower is the deformation:

A. False

B. True for same cases

C. True


28. Identify the material that under goes the most deflection:


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A. Titanium

B. Aluminum

C. Steel

D. Titanium alloy

29.Thresholds of Micromechanics is given by the scale:

A.

B.

C.

D.

30. Tensile Youngs 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


33. Higher thermal conductivity is for :

m109>

m103>

m108>

m106>


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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 %


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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


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 hydrogena. 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


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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 isa. 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. 1b. 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 of2.0 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


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10. Which of the following is not an electromagnetic wave?

a. visible light.

b. x-rays.

c. microwaves.

d. sound waves.

11. Bohrs 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 ofelectromagnetic 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 shorttime.

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 of 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. Its impossible to guess.


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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 surprisingobservation 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 thehydrogen atom?

a. zerob. h

c. h/

d.

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. Heisenbergd. 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.


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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 energyc. 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 toimprove 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.


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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


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.



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 thehighest 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.


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.


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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.

ETHICSCODEOF 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 orappear 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 quasi-governmental body or department shall not participate in decisions with respect to servicessolicited 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 orofficer of their organization serves as a member (True/False)

7) Engineers shall advise their clients or employers when they believe a project will not besuccessful (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 thework has been terminated (True/False)

10) Engineers in governmental, industrial, or educational employ are entitled to review and evaluatethe 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 ofrepresented products with products of other suppliers. (True/False)

12) Engineers shall continue their professional development throughout their careers and shouldkeep current in their specialty fields by engaging in professional practice, participating in


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continuing education courses, reading in the technical literature, and attending professionalmeetings 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. 1 nanometre= _______ cm.

A. 10(-9)

B. 10(-8)

C. 10(-7)

D. 10(-6)

5. The size of E.coli bacteria is ______ nm

A. 75000

B. 2000

C. 200

D. 5


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6. The diameter of human hair is _______ m

A. 75000

B. 75

C. 7.5 x 10(-5)

D. 7.5 x 10(-9)

7. The most important property of nanomaterials is

A. force

B. friction

C. pressure

D. temperature

8. The diameter of a bucky ball is about ______

A. 1 Ao

B. 100 Ao

C. 1 nm

D. 10 nm

9. 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


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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


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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 _____ m

A. 5-10

B. 10-20

C. 20-30

D. 100


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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 _____m.

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 Cn rings in which n = 5 and 6, but in a fullerene n= 5the graphene sheet consists of Cn rings in which n = 6, but in some fullerenes n =5


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the graphene sheet consists of Cn rings in which n = 6, but in fullerenes n = 5 and6the graphene sheet consists of Cn rings in which n = 5 or 6, but in most fullerenesn = 6

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 randomdirectionsThe tubes are aligned, axes parallel, with van der Waals forces operating betweenadjacent tubesThe bundles are of discrete sizes, and dipole-dipole forces hold the tubes together

end sem materials question

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