Question # 1

What exactly is quantum dot

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A semiconductor nanostructure that confines the motion of conduction band electrons, valence band holes or excitation 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 electron microscopy images of nanostructures smaller than 1 nanometer

The diameter of hydrogen atom is.______________nm

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10

1

0.1

0.01

The diameter of a bucky ball is about _____________

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o

1 A

1 nm

o

100 A

10 nm

Chemical and physical properties of metal nano particles of atoms were observed to change periodically depending upon

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Number of atoms in a particle

Shape of particle

type of organization

All of the above

The hardest material found in nature is

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Steel

Topaz

Diamond

Quartz

In confining and growing nano roade CNTs will act as.

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Template

Support

Source of oxidant

Sieve

Attention should be focused on qualitative changes in particle properties as a function of.

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Particle numebrs

Particle mass

Particle size

Particle density

Nano particles may interact with the support to be.

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Partially oxidized

Partically reduced

Both a and b

None

Length of semiconductor nanorods are in the range of.

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1.50 nm

1-50 micro meter

100-500 nm

50-100 nm

__________ are the extensions of bucky balls.

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Goodesic domes

Hexagons

Carbon nanotubes

AFM and STM

The most important problem regarding nano chemistry

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Elucidation of relationship between also and chemical reactivity of particle

Determination of size of particle

Determination of reactivity of particle

Determination of physical properties of nano particles.

When a large block of silicon wafer is reduced to smaller component and hence non material is formed this approach is called.

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Bottom up

Top down

Left to right

Right to left

Which of the following techniques is bulk technique.

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Powder XRD

Single Crystal XRD

SEM

TEM

A diameter of human hair is approximately ________________ m

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75000

75

7.5 x 10^-5

7.5 x 10^-9

The smallest cluster of carbon atoms in Bucky balls known till today consists of ___________ carbon atoms.

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75

20

60

15

The thermal conductivity of an SWNT along length is _____ watt/(m.k)

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35

330

386

3500

Fullerene or bucky ball is made up of ________ carbon atoms.

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100

20

75

60

When fullerencs were discovered they were thought to be

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First example of spherical aromatic molecule

First example of spherical non aromatic molecule

First example of diamond lime molecule

None of the above

Which of these historical works of art contain nanotechnology.

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Lycurgus cup

Medieval stained glass windows in churches

Damascus steel swords

All of the above

Who coined the word nanotechnology.

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Eric Drexler

Richard Feynamann

Sumio tijma

Richard smalley

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