Algebra
Sets, Relations and Functions
MCQ (Single Correct Answer)
Quadratic Equations and Inequalities
MCQ (Single Correct Answer)
Sequence And Series
MCQ (Single Correct Answer)
Permutations and Combinations
MCQ (Single Correct Answer)
Three Dimensional Geometry
MCQ (Single Correct Answer)
Trigonometry
Trigonometric Angles and Equations
MCQ (Single Correct Answer)
Inverse Trigonometric Function
MCQ (Single Correct Answer)
Height and Distance
MCQ (Single Correct Answer)
Properties of Triangles
MCQ (Single Correct Answer)
Calculus
Limit, Continuity and Differentiability
MCQ (Single Correct Answer)
Application of Derivatives
MCQ (Single Correct Answer)
Indefinite Integration
MCQ (Single Correct Answer)
Definite Integration
MCQ (Single Correct Answer)
Area Under The Curves
MCQ (Single Correct Answer)
Differential Equations
MCQ (Single Correct Answer)
1
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
If z1 and z2 are complex numbers with $$\left| {{z_1}} \right| = \left| {{z_2}} \right|$$, then which of the following is/are correct?

1. z1 = z2

2. Real part of z1 = Real part of z2

3. Imaginary part of z1 = Imaginary part of z2

Select the correct answer using the code given below.
A
Only 1
B
Only 2
C
Only 3
D
None of these
2
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
If the point z1 = 1 + i, where $$i = \sqrt { - 1} $$ is the reflection of a point z2 = x + iy in the line $$i\overline z - iz = 5$$, then the point z2 is
A
1 + 4i
B
4 + i
C
1 $$-$$ i
D
$$-$$1 $$-$$i
3
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
$$z\overline z + (3 - i)z + (3 + i)\overline z + 1 = 0$$ represents a circle with
A
centre ($$-$$3, $$-$$1) and radius 3
B
centre ($$-$$3, 1) and radius 3
C
centre ($$-$$3, $$-$$1) and radius 4
D
centre ($$-$$3, 1) and radius 4
4
NDA 2016 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
What is $$\sqrt {{{1 + {\omega ^2}} \over {1 + \omega }}} $$ equal to, where $$\omega$$ is the cube root of unity?
A
1
B
$$\omega$$
C
$$\omega$$2
D
i$$\omega$$, where $$i = \sqrt { - 1} $$