Nanomaterials Quiz

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

• Gas phase agglomeration

• Molecular self-assembly

• Mechanical grinding

• Molecular beam epitaxy

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

• Etching

• Dip pen nano-lithography

• Lithography

• Erosion

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

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

• Size

• Composition

• Surface properties

• None of the mentioned

Quantum confinement results in ___________

• Energy gap in semiconductor is proportional to the inverse of the square root of the size

• Energy gap in semiconductor is proportional to the inverse of the size

• Energy gap in semiconductor is proportional to the square of size

• Energy gap in semiconductor is proportional to the inverse of the square of size

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

• Size distribution

• Specific surface feature

• Quantum size effects

• All of the mentioned

Select the incorrect statement from the following options.

• Self-assembly is a top-down manufacturing technique

• In self-assembly, weak interactions play very important role

• Self-assembling molecules adopt an organised structure which is thermodynamically more stable than the single, unassembled components

• Compared to the isolated components, the self-assembled structure has a higher order

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

• Agriculture

• Food safety and biosecurity

• Product development

• All of the mentioned

What are the advantages of nano-composite packages?

• Lighter and biodegradable

• Enhanced thermal stability, conductivity and mechanical strength

• Gas barrier properties

• All of the mentioned

The efficiency of today's best solar cell is about ___________

• 15-20%

• 40%

• 50%

• 75%