Answer:
Option B
Explanation:
Concept Involved Parametric coordinates for y2=4ax are(at2,2at).

Description of Situation As the circle intersects the parabola at P and Q. Thus points P and Q should satisfy the circle.
Sol. p(2t2,4t) sholud lie on
x2+y2−2x−4y=0
⇒ 4t4+16t2−4t2−16T−0
⇒ 4t4+12t2−16t=0
⇒ 4t(t3+3t−4)=0
⇒ 4t(t−1)(t2+t+4)=0
∴ t=0,1⇒P(2,4)
Thus, are of △OPs=12OS×PQ
