1
JEE Main 2021 (Online) 18th March Morning Shift
+4
-1
If the equation $$a|z{|^2} + \overline {\overline \alpha z + \alpha \overline z } + d = 0$$ represents a circle where a, d are real constants then which of the following condition is correct?
A
|$$\alpha$$|2 $$-$$ ad $$\ne$$ 0
B
|$$\alpha$$|2 $$-$$ ad > 0 and a$$\in$$R $$-$$ {0}
C
|$$\alpha$$|2 $$-$$ ad $$\ge$$ 0 and a$$\in$$R
D
$$\alpha$$ = 0, a, d$$\in$$R+
2
JEE Main 2021 (Online) 17th March Evening Shift
+4
-1
Let S1, S2 and S3 be three sets defined as

S1 = {z$$\in$$C : |z $$-$$ 1| $$\le$$ $$\sqrt 2$$}

S2 = {z$$\in$$C : Re((1 $$-$$ i)z) $$\ge$$ 1}

S3 = {z$$\in$$C : Im(z) $$\le$$ 1}

Then the set S1 $$\cap$$ S2 $$\cap$$ S3 :
A
has exactly three elements
B
is a singleton
C
has infinitely many elements
D
has exactly two elements
3
JEE Main 2021 (Online) 17th March Morning Shift
+4
-1
The area of the triangle with vertices A(z), B(iz) and C(z + iz) is :
A
1
B
$${1 \over 2}$$| z |2
C
$${1 \over 2}$$| z + iz |2
D
$${1 \over 2}$$
4
JEE Main 2021 (Online) 16th March Evening Shift
+4
-1
The least value of |z| where z is complex number which satisfies the inequality $$\exp \left( {{{(|z| + 3)(|z| - 1)} \over {||z| + 1|}}{{\log }_e}2} \right) \ge {\log _{\sqrt 2 }}|5\sqrt 7 + 9i|,i = \sqrt { - 1}$$, is equal to :
A
8
B
3
C
2
D
$$\sqrt 5$$
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