How can I start contributing in linux kernel devlopment?
Being new to open-source should I focus on linux kernel or I should focus on other open-source projects?
Where do I get the recent projects on linux kernel?

For kernel development go here: http://kernelnewbies.org/

I'd gues going for kernel or other software development depends on your intrest and expertise on certain fields. If you don't know anything about driver development it might be hard to help out the kernel developers. Also there sure are other things to be done for the kernel. Maybe take a look at software you are intrested in and check on the bugtracker. See if you can fix some bugs or do other minor adjustments. This way you can explore the code and see if you can help out further. Either developing new features or rewriting old stuff.

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+1 for kernelnewbies.

The kernel is over 15 million lines of code - you can't expect to just learn it. Even a segment (say memory management, or initial boot code, or scheduler, or VFS, or ...) are huge and complex code.
Start with a small bite that you're (most) interested in.

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