Synthesis of Nano Materials Mid - I, September - 2014

1.Nanostructured materials are classified as
  • Zero dimensionalnanostructures
  • One dimensionalnanostructures
  • Two dimensionalnanostructures
  • All the above
Answer: D
2.Bottom-up approach includes
  • miniaturization of materials components (up to atomic level)
  • Macroscopic initial structures, which can be externally-controlled in the processing of nanostructures
  • All the above
  • None of the above
Answer: A
3.Microemulsions are colloidal nano-dispersions of
  • Water in oil stabilized by a surfactant film
  • Oil in water stabilized by a surfactantfilm
  • All the above
  • None of the above
Answer: C
4.In inert gas condensation synthesis of nanomaterials the factors which contributes to increase in average particle size are
  • Increasing gas pressure
  • Vapour pressure
  • Mass of the inert gas
  • All the above
Answer: D
6.The Nanotubes created using Arc discharge method areusually short tubes with diameters ranging from
  • 0.6 to 1.4 nm for single walled
  • 10nmdiameter multi‐walled nanotube
  • All the above
  • None of the above
Answer: C
7.Photolithographic process uses
  • Light to transfer a geometric pattern from a photomask to a light sensitive material
  • Beams of electrons to generate patterns on a surface
  • All the above
  • None of the above
Answer: A
8.Sputtering is a
  • Physical vapour deposition process
  • Chemical vapour deposition process
  • All the above
  • None of the above
Answer: A
9.Thermal evaporation process uses
  • A filament of high current (10-100 A)
  • A filament of low current (50-100 A)
  • All the above
  • None of the above
Answer: A
10.In Molecular beam epitaxy type of Hrapure elements are used
  • Gallium and Arsenic
  • Gallium and Indium
  • All the above
  • None of the above
Answer: A
11.The chemical reduction method is simple and the most versatile for preparing nano panding ------------------------
Answer: Metal
12.Co-precipitation is a wet chemical method to prepare various nanomaterials such as --------------- and ------------ 
Answer: Semiconductor quantum dots, nanocrystalline oxides
13.----------- and -------------- nanocrystals are obtained by arrested precipitation method.
Answer: CdS and ZnS
14.Mechanical attrition is a typical example of ------------------method of synthesis of
nanomaterials.
Answer: Top down down
15.Lithography process involves -------------- and ---------------
Answer: Masking and exposure
16.The process of co-precipitation deals with precipitation of ------------------in a matrix medium.
Answer: Multi-component or compound system
17.Co precipitation method involves --------------- and --------------- preparation of nanoparticles
Answer: Easy control of particle size and composition
18.An inorganic material is vaporized inside a ---------- chamber into which an inert gas
(typically argon or helium) is periodically admitted.
Answer: Vaccum
19.Mechanical milling is typically achieved using ------------- and ------------ mills.
Answer: High energy shaker, planetary ball, or Tumbler
20.---------------- nanoparticles are obtained by inert gas condensation technique
Answer: Metal nanoparticle