1. The lightest known metal is Lithium.
  2. The Atacama Desert is located in North Chile.
  3. The oil used to preserve timber is Creosote oil.
  4. The founder of USA was George Washington.
  5. The first talkie feature film in USA was ‘The Jazz Singer’.
  6. The chemical name of laughing gas is Nitrous oxide.
  7. The US state Mississippi is also known as Tar Heel state.
  8. The US state Indiana is also known as Volunteer state.
  9. The US state Missouri is also known as Hoosier state.
  10. The US state West Virginia is also known as Blue Grass state.