If we forgot our gmail or yahoo password we can recover it by answering our security question. But this technique can be used by other persons to hack your password. In the case of gmail there is only one security question but for yahoo there is two questions. To protect our account we should give verity answers for the questions so that it will not easily guess by the hacker. Most people give simple questions because think it is very easy to remember but it is also very easy to answer.(Ex: Most people select the question what is your phone number?- They also give their phone number. So this can easily identified by other person.)
To protect your account you can give any question but the answer should be different(ie not the expected answer).
Also use sms security alert feature of gmail.
If you use others mobile phones to enter into account you should sign out from your account. Don't directly close the browser. If you directly close the browser ,before closing you should clear the cache and cookies.
This article is only for ethical hacking purpose for protecting mail.
