ECEMAS: The Structure of Crystalline Solids - Part 2
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Questions and Answers

How many different possible combinations of a, b, c, α, β, and γ represent distinct crystal systems?

  • 5
  • 7 (correct)
  • 6
  • 8
  • Which crystal system has the greatest degree of symmetry?

  • Cubic (correct)
  • Orthorhombic
  • Triclinic
  • Hexagonal
  • Which crystal system has the least symmetry?

  • Rhombohedral
  • Cubic
  • Triclinic (correct)
  • Tetragonal
  • Which crystal structures belong to the cubic crystal system?

    <p>FCC and BCC</p> Signup and view all the answers

    Which crystal system does the HCP structure fall within?

    <p>Hexagonal</p> Signup and view all the answers

    What is the term used to describe the phenomenon where a material can have more than one crystal structure?

    <p>Polymorphism</p> Signup and view all the answers

    How are the coordinates of a point within a unit cell specified?

    <p>In terms of fractional multiples of the unit cell edge lengths (a, b, and c)</p> Signup and view all the answers

    Which of the following statements about carbon is true?

    <p>Diamond is formed at extremely high pressures.</p> Signup and view all the answers

    What is the crystal structure of pure iron at room temperature?

    <p>Body-centered cubic (BCC)</p> Signup and view all the answers

    Which of the following parameters is NOT used to define the unit cell geometry of a crystal structure?

    <p>Atomic radii</p> Signup and view all the answers

    What is the term used to describe the six parameters that define the unit cell geometry of a crystal structure?

    <p>Lattice parameters</p> Signup and view all the answers

    In the context of crystal structures, what does the term 'parallelepiped' refer to?

    <p>A three-dimensional shape with six parallelogram faces</p> Signup and view all the answers

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