Do Physics grad schools accept non-physics students with good Physics GRE score? These two questions https://math.stackexchange.com/questions/110303/is-a-good-gre-score-enough-for-a-non-math-graduate-to-be-accepted-in-a-decent-pu?rq=1&amp;fb_source=message and https://math.stackexchange.com/questions/110303/is-a-good-gre-score-enough-for-a-non-math-graduate-to-be-accepted-in-a-decent-pu?rq=1 inspire me to ask this question. 

Unlike Math GRE in Physics GRE, almost everything taught in first 3 years of undergrad is examined with almost equal percentage of total questions (Classical Mechanics 20%, EM 18%, QM 12%, Optics 9%) while in math, 50% can be scored only with good calculus skill. 


Can one expect to be accepted in good physics grad schools if he has good Physics GRE score? 
Another question is, can one go to theoretical physics grad school only with good score in Physics GRE? 


I hope this is appropriate place to ask these questions.
Graduate admissions is based on lots of different factors.  I don't think any one thing will make you in-eligible for acceptance, at even the best institutions---including not being a physics major.  That being said, unless you have physics (or similar) experience, or are in a related field, it will hurt your application.  I know numerous people with math, computer science, engineering and chemistry backgrounds who have joined (and are doing well in) prestigious physics programs (e.g. stanford, chicago, columbia).

If you have experience in a not-too-distant field (e.g. chemistry), one way to make your application more appealing - would be if you are interested in subjects somewhere between physics and chemistry (for example).

If you can demonstrate that you have excelled in your own field, and have an aptitude for physics (e.g. good GRE scores), you shouldn't have a problem!