Crystal Structure - Unit 1

The crystalline solid state has __________________________

• Longrange positional and rotational order
• Short range positional and rotational order
• a much higher symmetry than the liqued state
• the higher possible symmerty consistant with a regular filling of space

Which of the following has the least packing frachon ?

• Scc
• Bcc
• Fcc
• Diamond structure

The volume of the primitive unit cell of fcc structure with lattice constant a is ____________

• aᶟ
• a ᶟ/2
• aᶟ/4
• aᶟ/8

The ideal c/a ratio for the hexagonal close packed structure is ______________

• 1
• √ 8/II
• √ 3
• √ 8/3

The nearest neighbour distance in a bcc structure with lattice constant a is ____________

• a
• a √ 3/2
• a / √ 2
• √ 3 a/4

The two dimensional lattice with the higher rotational symmentry is ___________

• square lattice
• hexagonal lattice
• honeycomb lattice
• triangular lattice

The packing factor of diamond cubic crystal structure is ________

• 0.6
• 0.56
• 0.9
• none

A material having different properties in different direction in known as ____________

• amorphous
• copolymer
• anisotropic
• austenite

The metal which has hexagonal close packed structure is ___________

• silver
• iron
• magnesium
• aluminium

The number of nearest neighbours for a ______ lattice is _________

• Bcc , 8
• Fcc , 10
• HCP , 8
• FCC , 4