Concepts in complex numbers

 $z\ ,\ z_{1_{ }\ }and\ z_2\$  are complex number , then  $\left|\frac{z_1}{z_2}\right|=\ \frac{\left|z_1\right|}{\left|z_2\right|}$  , $z_2\ne0$  

• False

• True

 $\left|6-8i\right|$  Select the expression equivalent to:

• -2i

• -10i

• 10i

• 10

Find $\alpha$  for
  $z=-1-i$  

•  $-0.7854$  

•  $-0.8$ 

•  $0.7854$  

•  $0.8$  

• 10

• 10i

When a complex number is drawn on the complex plane. The distance from the origin is the value of

• the argument

• The modulus

• The real co-efficient

• The imaginary co-efficient

Find the magnitude of z = - 4 + 2i

• $2\sqrt{5}$

• $-2\sqrt{5}$

• $5\sqrt{2}$

• $-5\sqrt{2}$

What is the Modulus in a complex number $1\ +\ i\sqrt{3}$  

• 2

• 4

• 45 degrees

• 60 degrees 

 $3+3\iota$  

The argument of

• -2

• 1

• 2

• sqrt3