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When I execute a command as below it gives me an output as expected but when I run the same command on remote server it always gives me echo $? as 0.

locally
# <some command>
# echo $?

Remotely
# ssh server " <some command >; echo $? "

Now in case of remote execution I always get 0 as echo $? output.

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The $? is evaluated before the command is sent to the remote machine. Effectively, you are sending the command echo 0. Try 

ssh server ' <some command >; echo $? '

As Michael Hampton points out, single quotes prevent evaluating variables etc. before sending them to the remote command, while double quotes allow that.

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    To be clear, you should use the single quote ' instead of the double quote ".
    – Michael Hampton
    Jan 16, 2013 at 7:40

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