1
JEE Main 2018 (Online) 15th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
If a right circular cone, having maximum volume, is inscribed in a sphere of radius 3 cm, then the curved surface area (in cm2) of this cone is :
A
$$6\sqrt 2 \pi$$
B
$$6\sqrt 3 \pi$$
C
$$8\sqrt 2 \pi$$
D
$$8\sqrt 3 \pi$$
2
JEE Main 2018 (Online) 15th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
If $$\beta$$ is one of the angles between the normals to the ellipse, x2 + 3y2 = 9 at the points (3 cos $$\theta$$, $$\sqrt 3 \sin \theta$$) and ($$-$$ 3 sin $$\theta$$, $$\sqrt 3 \,\cos \theta$$); $$\theta \in \left( {0,{\pi \over 2}} \right);$$ then $${{2\,\cot \beta } \over {\sin 2\theta }}$$ is equal to :
A
$${2 \over {\sqrt 3 }}$$
B
$${1 \over {\sqrt 3 }}$$
C
$$\sqrt 2$$
D
$${{\sqrt 3 } \over 4}$$
3
JEE Main 2017 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
A tangent to the curve, y = f(x) at P(x, y) meets x-axis at A and y-axis at B. If AP : BP = 1 : 3 and f(1) = 1, then the curve also passes through the point :
A
$$\left( {{1 \over 3},24} \right)$$
B
$$\left( {{1 \over 2},4} \right)$$
C
$$\left( {2,{1 \over 8}} \right)$$
D
$$\left( {3,{1 \over 28}} \right)$$
4
JEE Main 2017 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
The function f defined by

f(x) = x3 $$-$$ 3x2 + 5x + 7 , is :
A
increasing in R.
B
decreasing in R.
C
decreasing in (0, $$\infty$$) and increasing in ($$-$$ $$\infty$$, 0)
D
increasing in (0, $$\infty$$) and decreasing in ($$-$$ $$\infty$$, 0)
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