Formation of Nano Structured Materials - 2 MCQ

Test your knowledge with important Formation of Nano Structured Materials - 2 MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30+ more Formation of Nano Structured Materials - 2 MCQs on Bissoy. Bissoy App

• Identify the disadvantage of the combustion method used in producing NSMs.
  ক

  Greater surface area

  খ

  Narrow particle size distribution

  গ

  Inhibits selective precipitation

  ঘ

  Better sinterability
• How can the process of nucleation be facilitated?
  ক

  Removing excess amount of solute from the solution

  খ

  Introducing suitable submicroscopic particles in solution

  গ

  Exceeding the equilibrium solubility without exceeding supersaturation limit

  ঘ

  Increasing the induction period.
• What is the main disadvantage of the microemulsion method used for synthesis of NSMs?
  ক

  Inability to control particle size

  খ

  Lower production yield

  গ

  Requirement of high temperature and pressure

  ঘ

  Thermodynamically unstable dispersion
• Which of these factors is not responsible for influencing the kinetics, hydrolysis, growth and condensation reactions in sol-get growth method?
  ক

  Solvent type

  খ

  pH of solution

  গ

  Temperature

  ঘ

  Reaction path
• Select the correct order of the CVD process used in making NSMs.
  ক

  Carrier gas and precursor sent to reaction chamber ➔ Vacuum and high temperature > 900°C is maintained ➔ Product formation ➔ Heat treatment

  খ

  Heat treatment ➔ Product formation ➔ Carrier gas and precursor sent to reaction chamber ➔ Vacuum and high temperature > 900°C is maintained

  গ

  Vacuum and high temperature > 900°C is maintained ➔ Carrier gas and precursor sent to reaction chamber ➔ Product formation ➔ Heat treatment

  ঘ

  Product formation ➔ Carrier gas and precursor sent to reaction chamber ➔ Vacuum and high temperature > 900°C is maintained ➔ Heat treatment
• Find out the incorrect statement with respect to sol-gel method of NSM synthesis.
  ক

  Method cannot produce inorganic-organic polymers

  খ

  Structure of gel can be altered by varying factors influencing reaction rates of hydrolysis and condensation

  গ

  Inexpensive method for forming nano structured materials

  ঘ

  Only method used to make homogeneous mixtures of NPs in liquid phase
• What is the greatest advantage of using microwave irradiation for NSM production?
  ক

  Longer crystallization time

  খ

  Heterogeneous nucleation

  গ

  Limited absorption of microwaves

  ঘ

  Uniform heating
• Define reverse micelles.
  ক

  Oil in water emulsions

  খ

  Oil in oil emulsions

  গ

  Water in oil emulsions

  ঘ

  Water in water emulsions
• Which method of NSM fabrication involves vaporization onto an organic substrate having ferric salts and reducing agents?
  ক

  Template synthesis

  খ

  Spray pyrolysis

  গ

  Sonochemical method

  ঘ

  Chemical vapour deposition
• Which of the following is not a drawback of the thermal decomposition method of NSM synthesis?
  ক

  Reduced production yield

  খ

  Lower selectivity of process

  গ

  High temperature process

  ঘ

  Requirement of surface treatment