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JEE Advanced Level Test: Complex Number- 4 - EmSAT Achieve MCQ


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30 Questions MCQ Test Mathematics for EmSAT Achieve - JEE Advanced Level Test: Complex Number- 4

JEE Advanced Level Test: Complex Number- 4 for EmSAT Achieve 2024 is part of Mathematics for EmSAT Achieve preparation. The JEE Advanced Level Test: Complex Number- 4 questions and answers have been prepared according to the EmSAT Achieve exam syllabus.The JEE Advanced Level Test: Complex Number- 4 MCQs are made for EmSAT Achieve 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for JEE Advanced Level Test: Complex Number- 4 below.
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JEE Advanced Level Test: Complex Number- 4 - Question 1

Let  z(α,β) = cosα + e sinα (α, β ∈ R, i = √-1) then the exhaustive set of values of modulus of z(θ, 2θ), as θ varies, is 

Detailed Solution for JEE Advanced Level Test: Complex Number- 4 - Question 1



JEE Advanced Level Test: Complex Number- 4 - Question 2

If Z1 ≠ - Z2 and  then (Z1, Z2 ∈C)

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JEE Advanced Level Test: Complex Number- 4 - Question 3

If z = x + iy be a non real complex number and a1 , a2 , a3 , b1 , b2 , b3 are all real,then 

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JEE Advanced Level Test: Complex Number- 4 - Question 4

If  then the maximum value of |Z| is equal to

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JEE Advanced Level Test: Complex Number- 4 - Question 5

Let Z1 = 10+ 6i and Z2 = 4+6i . If Z be a complex number such that    Then |Z - 7 -9i| =

Detailed Solution for JEE Advanced Level Test: Complex Number- 4 - Question 5



JEE Advanced Level Test: Complex Number- 4 - Question 6

If a complex number Z satisfy, |2Z + 10 + 10i | < 5√3 - 5  then the least principal argument of Z is

Detailed Solution for JEE Advanced Level Test: Complex Number- 4 - Question 6

Let P(z) be the point of least orgument 



JEE Advanced Level Test: Complex Number- 4 - Question 7

If a,b,c are integers not all equal andw is a cube root of unity (ω ≠ 1) then the minimum value of |a + bω+ cω2| is

Detailed Solution for JEE Advanced Level Test: Complex Number- 4 - Question 7




When a = b = 1, c = 2, it gives minimum value (since a,b,c not all equal)

JEE Advanced Level Test: Complex Number- 4 - Question 8

If 1, w, w2 .....wn-1 are nth roots of 1 then value of   equals to

JEE Advanced Level Test: Complex Number- 4 - Question 9

If 1, α1, α2 ,.......α99 are roots of Z100 = 1 then equal to

Detailed Solution for JEE Advanced Level Test: Complex Number- 4 - Question 9

Correct Answer :- b

Explanation : α12,........,α99

α1, 1α2,........,1α99

α1α2, α2α3, α3α4................α98α99 

Sum of α1α2, α2α3, α3α4................α98α99 = 0

Therefore, x - 1 = 0

x = 1

JEE Advanced Level Test: Complex Number- 4 - Question 10

If cosx + 2cosy + 3cosz = sin x + 2siny + 3sinz = 0 then the value of sin 3x + 8sin 3y+ 27 sin 3z is 

Detailed Solution for JEE Advanced Level Test: Complex Number- 4 - Question 10

α = cisx, β = cisy, γ = cisz
Given α + 2β + 3γ = 0 ⇒ α3 + 8β3 + 27 γ3 = 18αβγ
⇒ sin 3x + 8sin 3y + 27 sin 3z = 18sin(x + y + z)

JEE Advanced Level Test: Complex Number- 4 - Question 11

Let a complex number z, with minimum argument is lying on the cure |z + 4i| = 2 then

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JEE Advanced Level Test: Complex Number- 4 - Question 12

Number of ordered pairs (a,b) of real numbers such that (a + ib)2012 = a - ib holds good is

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JEE Advanced Level Test: Complex Number- 4 - Question 13

If | z - 3i| = 3, (where i = √-1) and arg z ∈ (0, π/2), then cot (arg (z))  is equal to 

Detailed Solution for JEE Advanced Level Test: Complex Number- 4 - Question 13

JEE Advanced Level Test: Complex Number- 4 - Question 14

If α0, α1, α2, ...αn-1 be the nth roots of unity, then value of  is equal to

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Diff. both sides w.r.t Z

JEE Advanced Level Test: Complex Number- 4 - Question 15

Let   then value of the determinant 

Detailed Solution for JEE Advanced Level Test: Complex Number- 4 - Question 15

If z1, z2 , z3 are collinear and az1 + bz2 + cz3 = 0 then a+b+c =0 .Hence  


JEE Advanced Level Test: Complex Number- 4 - Question 16

The least value of P for which the two curves arg z = π/6 and |z - 2 √3i| = P have a solution is ..

Detailed Solution for JEE Advanced Level Test: Complex Number- 4 - Question 16

  represents a circle of radius p having centre at (0, 2 √3) and arg z = π/6 is a line making an angle of 300 with OX and lying in 1st quadrant.  
Let CM be perpendicular from C on OA.  Then, 

Now, the two curves will intersect if CM ≤ P  i.e., 3 ≤ P ⇒ P ≥ 3
Hence, the least value of p is 3 

JEE Advanced Level Test: Complex Number- 4 - Question 17

If |z -i| ≤ 2 and z0 = 5+3i , the maximum value of  |iz + z0| is

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JEE Advanced Level Test: Complex Number- 4 - Question 18

For all complex numbers z1 ,z2 satisfying |z1| = 12 and |z2 - 3 - 4i| = 5 , the minimum value of  |z1 -z2| is 

Detailed Solution for JEE Advanced Level Test: Complex Number- 4 - Question 18

Minimum value of |z1 - z2| = 12 - 10 = 2

JEE Advanced Level Test: Complex Number- 4 - Question 19

If b ≠ 1 be any nth root of unity then 1 + 3β + 5β2 + ........n terms equals 

Detailed Solution for JEE Advanced Level Test: Complex Number- 4 - Question 19

β = (1)1/n ⇒ βn = 1 ........(1)
If S be the sum of the given series which is arithmetic geometric series, then 


JEE Advanced Level Test: Complex Number- 4 - Question 20

The value of 

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Sum of the roots = 0

JEE Advanced Level Test: Complex Number- 4 - Question 21

The number of solutions of the equation is

Detailed Solution for JEE Advanced Level Test: Complex Number- 4 - Question 21

∴ x2 + y2 = 0 ⇒ x = 0, y = 0 ⇒ z = 0 |z| = 1 ⇒ |z|2 

Putting in given equation

Hence there are four solutions z = 0, 1, ω,ω2 .

JEE Advanced Level Test: Complex Number- 4 - Question 22

If a1, a2,--------an  are real numbers and cos α + isin α is a root of zn +a1zn-1 + a2zn-2 +-----+an-1z+an = 0, then the value of a1 cos α + a2 cos 2α + a3 cos 3α + ------ +an cos na is

Detailed Solution for JEE Advanced Level Test: Complex Number- 4 - Question 22

cosα - isinα is root of zn + a1zn-1 + a2zn-2 + ----
an (1/z)n + an-1(1/z)n-1 + -------+ a1(1/z) + 1 = 0.
-----+an-1z+an = 0 i.e of
Equating real and imaginary parts on both sides, 

acos nα + an-1 cos (n-1)α + -----+a2 cos 2α + a1 cos α + 1 = 0

JEE Advanced Level Test: Complex Number- 4 - Question 23

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JEE Advanced Level Test: Complex Number- 4 - Question 24

If |z – 1| + |z + 3| ≤ 8, then the range of values of |z – 4| is,  

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z lies inside or on the ellipse.

Clearly the minimum distance of z from the given point 4 is 1 and maximum distance is 9

JEE Advanced Level Test: Complex Number- 4 - Question 25

If a, b, c, a1 , b1 , c1  are non zero complex numbers satisfying   and  

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JEE Advanced Level Test: Complex Number- 4 - Question 26

Let z and w be complex numbers such that   and arg zω =π, then arg z = 

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JEE Advanced Level Test: Complex Number- 4 - Question 27

Let z = cosθ + isinθ. Then the value of  at θ = 2° is

Detailed Solution for JEE Advanced Level Test: Complex Number- 4 - Question 27


∴ 

= sin θ + sin 3θ + sin 5θ + .....+ sin 29θ



JEE Advanced Level Test: Complex Number- 4 - Question 28

let a be a complex number such that |a| = 1 If the equation az2 + z + 1 =0 has a pure imaginary root, then tan (arg a) =

Detailed Solution for JEE Advanced Level Test: Complex Number- 4 - Question 28

a = cos α + i sin α, z = iy, y ∈ R
-(cos α + i sin α) y2 + iy + 1 = 0
⇒ y2 cos α = 1, sin α = y
y sin α = 1, sin cey ≠ 0
∴ sin2 α =  cos α, cos2 α+ cos α - 1 = 0



JEE Advanced Level Test: Complex Number- 4 - Question 29

 is purely imaginary, then number of values of a in [0, 2π ] is---

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Multiplying numerator and denominator with 1 + 2isinα/2 then real part = 0

JEE Advanced Level Test: Complex Number- 4 - Question 30

If z1z2 ∈ C,  and  = 11 then the value of is

Detailed Solution for JEE Advanced Level Test: Complex Number- 4 - Question 30

       ............. (i)
        ............. (ii)
On multiplying Equation (i) by i and adding it Eq. (i), we get

Again multiplying Eq. (ii) by i and subtracting it from Eq (i) we get
  ............. (iv)

On multiplying Eqs (iii) and (iv) we get

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