I complete bsc form ignou in physics,math and biology in no honors. may i join msc in physics honors in regular mode or not?

Yes, you can join. There are few institute who do not accept a distance learning degree however all reputed institutes including TIFR, University of mumbai, University of Pune, IITs, IISc etc. accept distance degree. IGNOU is a central university under Ministry of HRD and it degree holds same status

It depends on your earlier performance in IGNOU. Degrees are all the same, but our performance at a stretch counts considerably. So, you can know for yourself and you can know further, if you study the admission rules.You have to qualify for the admission and it is a primary condition.