Crossword time!

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Across
  1. 5. ____particles are smaller than 10-7 m in at least one dimension
  2. 6. Piezoelectric materials generate _____type of current
  3. 7. Well-known natural piezoelectric material
  4. 8. Superconductors offer____ resistance to passage of electricity
Down
  1. 1. ______ cell converts the energy of light directly into electricity
  2. 2. An allotrope of carbon having high thermal conductivity, electrical conductivity, elasticity, etc. (Hint: Used in pencil tips)
  3. 3. Name the native property of functional materials which is used in MRI scans in medical field
  4. 4. Repeating polymeric units in DNA and RNA are