...
def doing (event):
  n=sca.get()
  qst=qstn[n]
  r_n=r[n]
  label1.configure(text=qst)
  rad0.configure(text="1 - "+r_n[0])
  rad1.configure(text="2 - "+r_n[1])
def otvet(event):
  n=sca.get()
  i=var.get()
  if i==i_p[n]:
    label2.configure(text="BEPHO")
  else:
    label2.configure(text="HEBEPHO")
...
qst=""
qstn=["vpros1","vopros2","vopros3"]
r0=['v11','v12']
r1=['v21','v22']
r2=['v31','v32
r=[r0,r1,r2]
i_p=[1,0,1]
n=IntVar()
var=IntVar()
var.set(0)
rad0 = Radiobutton(frame,text="",variable=var,value=0)
rad1 = Radiobutton(frame,text="",variable=var,value=1) 
...
but=Button(frame,text="OTBET")
but.bind("<Button-1>",otvet)

label2=Label(frame,text="")
label2.grid(row=4,column=1)

but_nxt=Button(frame,text="NEXT")
but_nxt.bind("<Button-1>",doing)

sca = Scale(root,orient=HORIZONTAL,length=100,from_=0,to=2,tickinterval=1,resolution=1) 
...