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Math 11 Chapter 1
Number System
Test - 16
1.
The additive identity is the set of complex numbers is?
a) (1,1)
b) (0,1)
c) (1,0)
d) (0,0)
2.
The additive inverse of a complex number (x,y) is?
a) (-x,-y)
b) (-x,y)
c) (x,-y)
d) (-y,-x)
3.
The multiplicative inverse of a complex number (x,y) is?
a) X / x
2
+ y
2
, y / x
2
+ y
2
b) X / x
2
+ y
2
, -y / x
2
+ y
2
c) -X / x
2
+ y
2
, y / x
2
+ y
2
d) -X / x
2
+ y
2
, -y / x
2
+ y
2
4.
Every real number is a?
a) Rational number
b) Natural number
c) Prime number
d) Complex number
5.
The Cartesian Product of two non-empty sets A and B dented by?
a) AB
b) BA
c) AxB
d) None of these
6.
The members of a Cartesian Product, are called?
a) Real numbers
b) Ordered pairs
c) Elements
d) None of these
7.
Conjugate of a complex number x- iy is?
a) -x + iy
b) -x-iy
c) x+y
d) x-iy
8.
The modulus of a complex number?
a)
√
x
2
-y
2
b)
√
x
2
-y
2
c)
√
Sr x
2
+y
2
d) None of these
9.
Polar form of a complex number x + iy is
a) Cos Ø +/sin Ø
b) Rcos Ø-/rsin Ø
c) r cos Ø + /r sin Ø
d) None of these
10.
If Z = x + iy then |
`
Z | is?
a)
√
x
2
-y
2
b)
√
x
2
+y
2
c)
√
x
2
y
2
d) None of these
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