1 MARK QUESTIONS

Contents

Introduction

S/V ratio

Quantum Confinement

Synthesis of nano materials

Ball milling method

Chemical Vapor Depositon

Sol-Gel Method

X-ray diffraction

Scanning Electron Microscope

Transmission Electron Microscope

Applications of Nano materials

1M Previous Years' Questions

  1. List any two differences between SEM and TEM.
  2. Name any two Bottom-up fabrication methods of nanomaterials.
  3. What is quantum confinement effect?
  4. Find the critical angle when a light ray propagates from a medium of refractive index 1.55 to medium of refractive index 1.475
  5. What is the meaning of CVD?
  6. Sol-Gel method belongs to which approach.
  7. Distinguish 1-D, 2-D and 3-D nanomaterials.
  8. Why nanomaterials show different physical and chemical properties than its bulk form?
  9. Mention the importance of quantum confinement at nanoscale.
  10. What are nanomaterials?
  11. Find the condition for Bragg’s law?
    12. a) nλ = 2d cos 2θ      b) nλ = 2d sin2θ      c) nλ = 2d cosθ      d) nλ = 2d sinθ
  12. Write any two advantages of SEM and TEM.
  13. What is X-ray diffraction? Why does it happen?
  14. Does interatomic distance of a material changes upon reduction of size to nano scale?
  15. Which are the two factors changes the properties of materials at nano scale?
  16. Write any four properties of nanomaterials.
  17. What are the two principal factors that cause the properties of nanomaterials to differ from other materials?
  18. Why are X-rays not deflected by electric and magnetic field?