i am fully qualified for the job and will sincerely carry out my duties
yes
Are you asking why you are best qualified for a job? Is it a specific job you consider yourself qualified to do? Or are you wondering if you are qualified for any job at all? The best way to ask the question is to say "Why am I best qualified for THIS job". (your English skills aside - you never want to ask the person with the job if he feels you are qualified, so if this question stems from your concern over how to effectively interview for a job - don't ask them why you are best qualified - TELL them.
you're too qualified for the job.
He's better qualified to do the job.
The job you are qualified for.
Tailor your answer to the job you are applying for. You might say you are qualified based on your education or prior experience. You might also say because you bring the skill set that they are looking for.
A person may feel qualified for a job, because they have previous experience from other jobs. A person may also be qualified because of a college education.
I would say it would be beneficial to complete a national job search so that you can establish your qualifications . Many job recruiters check these websites when they are looking for qualified applicants
http://www.bls.gov/oco/ocos162.htm#outlook The demand is good...according to the government's job outlook website. They do say it is a predominately "part time" job.
Because I am qualified for the job I am applying for.
it usually means they are scared of how you will act when you get that job. if you are qualified to be a supervisor then apply for that job. if you are over qualified for a regular position, then dont tell them about your other qualifications. its scares them.