Engineering Physics

Multiple Choice Questions

1. If the atoms or molecules in a solid are periodical at regular intervals of distances in three dimensions, then that solid is known as:     ( )
   1. crystalline solid
   2. amorphous solid
   3. liquid crystals
   4. none
2. Unit cells for most of the crystals are:     ( )
   1. spherical
   2. elliptical
   3. parallelopiped
   4. none
3. Crystallographic axes are obtained by the intersection of _____ non-coplanar faces of the unit cell.     ( )
   1. three
   2. four
   3. five
   4. six
4. The number of crystal systems is:     ( )
   1. 5
   2. 7
   3. 14
   4. 21
5. The number of Bravais lattices is:     ( )
   1. 256
   2. 7
   3. 14
   4. 37
6. A cubic crystal system is represented by:     ( )
   1. a = b = cα = β = γ ≠ 90°
   2. a = b ≠ cα = β = γ = 90°
   3. a = b = cα = β = γ = 90°
   4. a ≠ b ≠ cα = β = γ = 90°
7. Orthorhombic crystal system is represented ...