1
WB JEE 2018
MCQ (Single Correct Answer)
+1
-0.25
Change Language
Let P(at2, 2at), Q, R(ar2, 2ar) be three points on a parabola y2 = 4ax. If PQ is the focal chord and PK, QR are parallel where the co-ordinates of K is (2a, 0), then the value of r is
A
$${t \over {1 - {t^2}}}$$
B
$${{1 - {t^2}} \over 1}$$
C
$${{{{t^2} + 1} \over t}}$$
D
$${{{{t^2} - 1} \over t}}$$
2
WB JEE 2018
MCQ (Single Correct Answer)
+2
-0.5
Change Language
Consider the parabola y2 = 4x. Let P and Q be points on the parabola where P(4, $$-$$ 4) and Q(9, 6). Let R be a point on the arc of the parabola between P and Q. Then, the area of $$\Delta$$PQR is largest when
A
$$\angle$$PQR = 90$$^\circ$$
B
R(4, 4)
C
R$$\left( {{1 \over 4},1} \right)$$
D
R$$\left( {1,{1 \over 4}} \right)$$
3
WB JEE 2017
MCQ (Single Correct Answer)
+1
-0.25
Change Language
The axis of the parabola $${x^2} + 2xy + {y^2} - 5x + 5y - 5 = 0$$ is
A
$$x + y = 0$$
B
$$x + y - 1 = 0$$
C
$$x - y + 1 = 0$$
D
$$x - y = {1 \over {\sqrt 2 }}$$
WB JEE Subjects
EXAM MAP
Medical
NEET
Graduate Aptitude Test in Engineering
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CBSE
Class 12