## Amplitude (Argument) of Complex Numbers MCQ Basic Level

Compared to other sections, mathematics is considered to be the most scoring section. If prepared thoroughly, mathematics can help students to secure a meritorious position in the exam. These questions are very important in achieving your success in Exams after 12th.

Q1. The amplitude of 0 is

•  0
•  Ï€/2
•  Ï€
•  None of these

None of these

Q2. The argument of the complex number -1+i√3 is

•  – 60o
•  60o
•  120o
•  – 120o

120o

Q3. Argument of -1-i√3 is

•  2Ï€/3
•  Ï€/3
•  - Ï€/3
•  - 2Ï€/3

- 2Ï€/3

Q4. The argument of the complex number (13-5i)/(4-9i) is

•  Ï€/3
•  Ï€/4
•  Ï€/5
•  Ï€/6

Ï€/4

Q5. Argument and modulus of (1+i)/(1-i) are respectively

•  -Ï€/2 and 1
•   Ï€/2 and √2
•  0 and √2
•  Ï€/2 and 1

Ï€/2 and 1

Q6. If argz<0 arg="" equal="" is="" p="" then="" to="" z="">

•  Ï€
•  - Ï€
•  - Ï€/2
•  Ï€/2

Ï€

Q7. Let z and w be the two non-zero complex numbers such that | z | = |w| and arg z + arg w =Ï€. Then z is equal to

•  w
•  -w
•  conj(w)
•  -conj(w)

-conj(w)

Q8. If z is a complex number, then the principal value of arg (z) lies between

•  - Ï€/4 and Ï€/4
•  - Ï€/2 and Ï€/2
•  - Ï€ and Ï€
•  None of these

- Ï€ and Ï€

Q9. The principal value of the argument of the complex number – 3i is

•  0
•  Ï€/2
•  - Ï€/2
•  None of these

- Ï€/2

Q10. If |z1+z2|=|z1-z2|, then the difference in the amplitudes of z1 and z2 is

•  Ï€/4
•  Ï€/3
•  Ï€/2
•  0

Ï€/2

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Amplitude (Argument) of Complex Numbers MCQ Basic Level