Question 1

What is the advantage of using Surface Mount Technology?

Accepted Answer

D

Question 2

Which of the following is an example of top- down approach for the preparation of nanomaterials?

Accepted Answer

Mechanical grinding is a top-down approach where larger particles are broken down into nanoscale particles.

Question 3

Which of the following is an example of bottom-up approach for the preparation of nanomaterials?

Accepted Answer

Dip pen nano-lithography is a bottom-up approach as it involves building up structures atom by atom or molecule by molecule.

Question 4

The properties like melting point, solubility, color, etc changes on varying the

Accepted Answer

The answer of The properties like melting point, solubility, color,...

Question 5

The properties like dispersibility, conductivity, etc changes on varying the

Accepted Answer

The answer of The properties like dispersibility, conductivity, etc changes...

Question 6

Quantum confinement results in

Accepted Answer

Quantum confinement leads to an increase in the energy gap as the size of the semiconductor decreases, specifically proportional to the inverse of the square of the size.

Question 7

Which of the following is the principal factor which causes the properties of nanomaterials to differ significantly from other materials?

Accepted Answer

The properties of nanomaterials differ significantly from other materials due to a combination of factors including size distribution, specific surface features, and quantum size effects. These factors collectively influence the physical, chemical, and electronic properties of nanomaterials, making them distinct from bulk materials.

Question 8

Select the incorrect statement from the following options.

Accepted Answer

Self-assembly is a bottom-up manufacturing technique, not top-down. It involves components spontaneously organizing into structures without external guidance, relying on the intrinsic properties of the components, which is the opposite of the top-down approach where structures are crafted from larger materials.

Question 9

Which of the following is the application of nanotechnology to food science and technology?

Accepted Answer

Nanotechnology is applied across various aspects of food science and technology, including agriculture (for enhancing crop production and protection), food safety and biosecurity (for detecting contaminants and ensuring food safety), and product development (for improving food quality, texture, and nutritional value).

Question 10

What are the advantages of nano-composite packages?

Accepted Answer

Nano-composite packages offer several advantages, including being lighter and potentially biodegradable, providing enhanced thermal stability, conductivity, and mechanical strength, as well as improved gas barrier properties. These benefits make them suitable for a wide range of applications, particularly in packaging where these properties can significantly extend the shelf life and improve the sustainability of packaged goods.

Question 11

The efficiency of today's best solar cell is about

Accepted Answer

The most efficient solar cells today can reach efficiencies of around 40% under laboratory conditions using multi-junction technology.

Question 12

The configuration of Buckminsterfullerene is

Accepted Answer

Buckminsterfullerene has a configuration of 20 hexagons and 12 pentagons, resembling a soccer ball.

Question 13

C₆₀ is soluble in

Accepted Answer

CS2 (carbon disulfide) is a non-polar molecule, making it soluble in non-polar solvents like benzene. Water, ammonia, and HCl are polar solvents, so CS2 would not be soluble in them.

Question 14

CNTs stands for

Accepted Answer

CNTs stand for carbon nanotubes, which are cylindrical molecules that consist of rolled-up sheets of single-layer carbon atoms (graphene). They have unique properties that make them potentially useful in a wide variety of applications in nanotechnology, electronics, optics, and other fields of materials science.

Question 15

CNTs are capped on both ends with which carbon nanostructure?

Accepted Answer

Carbon nanotubes (CNTs) are capped on both ends with a carbon nanostructure that resembles a buckminsterfullerene, which is represented by the formula C60. This structure is a spherical arrangement of carbon atoms, similar to a soccer ball, and does not directly correspond to graphite, diamond, or benzene. The notation "c₆₀" is a coded representation, but the correct answer is related to the fullerene structure, which is implied here.

Question 16

The metallic tubes have which kind of structure?

Accepted Answer

Metallic tubes have an armchair structure because the carbon atoms are arranged in a hexagonal lattice with the tubes running along the armchair direction.

Question 17

The carbon tubes have high conductivity.

Accepted Answer

Carbon nanotubes have high electrical conductivity due to their unique molecular structure, which allows electrons to flow freely along the tube's length.

Question 18

Carbon nanotubes display magnetoresistance at low temperature.

Accepted Answer

Carbon nanotubes can exhibit magnetoresistance, especially at low temperatures, due to the quantum interference effects and the ballistic transport of electrons within them.

Question 19

Identify the process.

Accepted Answer

The answer of Identify the process.
...

Question 20

The main purpose of CNTs in fuel cells is

Accepted Answer

The answer of The main purpose of CNTs in fuel...

Quiz 4: Nanotechnology and Surface Mount Technology: Properties, Preparation, and Applications