It will list the contents of /

it will list the contents of home directory

It will show the content of the /home directory

it will show the list of files&directories (say contents) in
the current directory which u r working....

it will shows all users in serversystem

It will show the shell as well as the the path from home
directory to the current directory.
eg: say we are in diretory swaroopa and swaroopa is there in
the home directory here is the o/p
bash: /home/swaroopa/..: is a directory

Swaroopa kalgi

It will list the files and directories of the current user 
parent's login directory

i.e. 
If the current user smith login directory is "/home/smith",
then the parent's login directory is "/home"

In this example, the files and directories in "/home" are 
listed.

It will list the files and directories of the current user 
parent's login directory

i.e. 
If the current user smith login directory is "/home/smith",
then the parent's login directory is "/home"

In this example, the files and directories in "/home" are 
listed.

It prints the directories and file which is in your parent 
directory.
If u are logged in root ..it will show contents of / 
directory. 

If u are logged in /home/sandesh ....it will show contents 
of /home directory . 

~/ means the user login directory.

it display the home directory content.

It will simple list of files and dir.s ( contents ) of the
Root directory i.e., / .

it will display all the files and directories in the parent 
of the current directory.

it will list all the contents of the root directory.
doesn't matter in which section of the file or directory 
you are working in whenever you will give this command it 
will always list the contents of the root directory.