Question

Which of the following best describes the motion of the particles in a piece of steel?
None are moving
A few are moving
All are moving
Most are moving

Most solids_____
are dense and difficult to compress
are able to flow
are amorphous
have a disorderly structure

Cyrstals are classified into how many different crystal systems?
4
5
6
7

Answer 1

the first answer is:None are moving , because particules dont move unless there exists electric current passage on the steel.

Most solids are  dense and difficult to compress (obvious answer)

Cyrstals are classified into how many different crystal systems? the  answer is 7, (According to Bravais)

Answer 2

1)

C - All are moving

2)

A - are dense and difficult to compress

3)

D - 7