no. you can't do a double degree in B Psych and B Science
what you can do is B Science and do two majors (eg maths and Psych)
or B Psych with another major in maths then use any spare 'filler' subjects in physics.
Alternately, you could do Liberal Studies which is a 5 year course that results with an arts major and a science major. For your arts component, you could major in Psych and if your marks are good enough, go on and do honours. And for your Science component, major in maths with a minor in physics