physics

________ contain zero number of unpaired electrons

• diamagnetic

• paramagnetic

• ferromagnetic

• ferrimagnetic

Which of the following types of solids is represented by substances like glass, rubber, fused silica, plastics etc.

• polycrystalline

• amorphous

• crystalline

• plasma

Which of the following is not a property of crystalline solid?

• sharp melting point

• isotropy

• definite geometry

• anisotropy

lkhdkjhhdfbvdff

• fdfvff

• ffddffggs

• fdfdfdf

• fdfdf

The lattice site in a pure crystal cannot be occupied by

The packing efficiency in simple, fcc, bcc unit cells will be respectively

• 74% 52.4% 68%

• 52.4% 68% 74%

• 68% 74% 52.4%

• 52.4% 74% 68%

Example for crystalline solid

• Glass

• Quartz

• Plastic

• Rubber

What type of material is this one?

• Crystal

• Amorphous

• Covalent Crystal

• Ionic Crystal

What is the coordination number in the FCC structure?

• 24

• 12

• 8

• 4

The crystal structure of sodium chloride is

• BCC
• FCC
• amorphous
• covalent