Hi, A question in an application asks me to fill all previous 'visas' I hold.Should I write there my F1 status there or is it different from my B1 visa which I have in my passport? Kindly reply to my query.thank you

I would definitely mention it, it's better to give them information they don't need than to leave out information they need to know. Besides this if it asks you to list all previous visas you were issued then your F1 does count.