Nanotechnology Mid - II, November - 2014

1.The first macroscopic quantities of C60 were produced in 1990 by what is now known as the ______
  • Smalley and Harold Kroto
  • Harold Kroto and Ozin
  • Kratschmer-Huffman
  • Klabunde’s and Ozin’s
Answer: D
2.Average C-C distance in C60 & C70 is ___________
  • 0.44 A° and 0.43A°
  • 1.44 A° and 1.43A°
  • 2.44 A° and 2.43A°
  • 3.44 A° and 3.43A°
Answer: B
3.Carbon nanotubes (CNTs) were first discovered by Iijima in ____________
  • 1991
  • 1992
  • 1993
  • 1995
Answer: A
4.The chiral angle θ between the vectors Ch and a , with values of θ in the range
  • 0 < θ <40°
  • 0 < θ < 10°
  • 0 < θ < 20°
  • 0 < θ < 30°
Answer: D
5.In Arc discharge synthesis, an arc is produced across a ___________ gap between two graphite electrodes 5 to 20 mm in diameter.
  • 0.5mm
  • 1mm
  • 1.5mm
  • 2mm
Answer: B
6.Core particles can be coated with a shell to obtain a ______________
  • single nanoshell
  • bulk nanoshell
  • Double nanoshell
  • Core nanoshell
Answer: A
7.An increase in either the core size or shell length results in longer emission.
  • Wavelength
  • Frequency
  • Mobility
  • Velocity
Answer: A
8.Nanoshell particles constitute a special class of ____________ materials.
  • Nano-Tubes
  • Fullerene
  • Nano-Composite
  • Nano Polymer
Answer: C
9.Luminescence (specifically, fluorescence) is commonly used in __________ techniques
  • Optical Physical-Sensing
  • Optical Chemical-Sensing
  • Optical Biological-Sensing
  • None of the above
Answer: B
10.Blood Glucose biosensors launched by Medi- sense Exac Tech. in ______________
  • 1977
  • 1967
  • 1987
  • 1997
Answer: C
11.Fullerene or C60 consist of 20 hexagonal and 12 pentagonal rings as the basis of ______________ closed cage structure.
Answer: Icosahedra symmetry
12.The C60 crystal is ______________, but when doped with an alkali atom it becomes _________________
Answer: An insulator, electrically conducting.
13.When intercalated with ___________________ crystalline graphite becomes super conducting at the extremely low temperature of a few tenths of a Kelvin.
Answer: Potassium atoms
14.A carbon nanotube is a _________________ rolled into a cylinder.
Answer: Honeycomb lattice
15.The energy gap of semiconducting carbon nanotubes can be varied continuously from 1eV to 0eV, by varying the __________________
Answer: Nanotube diameter
16.__________________ carbon nanotubes are metallic
Answer: Armchair
17.The discovery of the nanoshell was made by Professor _________________
Answer: Naomi J. Halas
18.Monolayer-protected gold nanoparticles are particularly of interest because of their _______________ in air.
Answer: Stability
19.Nanosensors deliver sensitivity orders of magnitude better than conventional devices and provide such performance advantages as __________________
Answer: Fast response and portability.
20.The core/shell type nanoparticles can be broadly defined as comprising a core is ________________ and a shell ___________________
Answer: Inner material, outer layer material.