Nanotechnology-Module 1

The first talk about nano-technology was given by ___________

• Marie Curie
• Isaac Newton
• Albert Einstein
• Richard Feynman

Nanomaterials are the materials with at least one dimension measuring less than ___________

• 200 nanometers
• 50 micrometers
• 1 millimeter
• 100 nanometers

Nobel laureate Richard P. Feynman during his well renowned 1959 lecture described Nanotechnology as______________

• There is plenty of Room at the Bottom

• The study of ancient civilization

• The exploration of outer space

When semiconductors are reduced to nanometres they become pure conductors.

• True

• False

Answer explanation

When semiconductors are reduced to the nano form their chemical properties change significantly and they become insulators, as there is no more space for free electrons to move.

The melting point of particles in nano form ___________

• increases
• stays the same
• fluctuates
• decreases

Answer explanation

For the particles in the nano form, the melting point reduces significantly. Other chemical properties are also changed as the dimensions of the object comes in the nano range.

The colour of the nano gold particles is ___________

• blue
• Varies

• yellow
• red

Answer explanation

The colour of the nano gold particle varies with the size of the particles. It shows different colours like orange, red, purple, or greenish.

Nanomaterials exhibit unique color different from bulk material due to_________

• Surface Plasmon Resonance

• Photoelectric effect

Top-down approach refers to successive cutting of a bulk material to get nanoparticles.

• True

• False

   Bottom-up approach is the building up of a material from the bottom that is orderly assembling atom by atom, molecule by molecule or cluster by cluster.

• True

• False

Sol-gel, Precipitation, Hydrothermal synthesis are the examples of

• Top-down Approaches

• Bottom-up Approaches