1 


2 
The real part of the complex number a + bi is: 

3 
Division of a natural number by another natural number gives: 
 A. always a natural number
 B. always an integer
 C. always a rationalnumber
 D. always an irrational number

4 
If z<sub>1</sub> = 4i and z<sub>2</sub> = 3  9i, then z<sub>1</sub> + z<sub>2</sub> = 
 A. 3  5i
 B. 3i  5
 C. 7  9i
 D. 3 + 5i

5 
π, e are: 
 A. integers
 B. natural numbers
 C. rationalnumbers
 D. irrationalnumbers

6 
The imaginary part of the complex number a + bi is: 
 A. a
 B. b
 C. bi
 D. none of these

7 


8 
If z = x + i y = r (cos Θ + i sin Θ), then arg z is: 
 A. tan Θ
 B. cos<sup>2</sup>Θ + sin<sup>2</sup>Θ
 C. r
 D. Θ

9 

 A. real numbers
 B. complexnumbers
 C. primenumbers
 D. oddnumbers

10 
Product of a complex number and its conjugate is: 
 A. a real number
 B. irrationalnumber
 C. a complexnumber
 D. either real number or complexnumber
