Crystal Physics basic terms

Amorphous solids have _______ structure.

• Dendritic

• Regular

• Irregular

• Linear

What is a crystal?

• Its a solid substance with periodic arrangement of atoms

• its a liquid substance

• its a solid substance with random arrangement of atoms

• its a gas

Define - unit cell

• smallest volume from which the entire crystal is built on by irregular repetition in 3 dimensions.

• volume from which the entire crystal is built on by reverse repetition in 3 dimensions.

• largest volume from which the entire crystal is built on by translational repetition in 3 dimensions.

• smallest volume from which the entire crystal is built on by translational repetition in 3 dimensions.

An amorphous material have

• Short range of order

• Indefinite melting point

• Isotropic nature

• All the above

The total number of crystal system is

• 5

• 8

• 7

• 4

An example of non- crystalline material

• Plastic

• Graphite

• Gold

• NaCl

• None of the above

What is crystallography?

• Study of cells

• Study of earth

• Study of oceans

• Study of crystals

What is a grain boundary?

• Site where 5 crystals meet

• Site where 9 crystals meet

• Site where 2 crystals meet

• Site where 15 crystals meet

what do you understand by term Lattice Parameters?

• three edges of unit cell

• three inter axial angles of unit cell

• three edges and inter-axial angles

• three Dimensional cube

Unit Cell can be represented as parallelopiped in 2D and Parallelogram in 3D

• True

• False

• None of the above

• All of the above