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Math 11 Chapter 1
Number System
Test - 17
1.
If -x - iy is a complex number then modulus of the complex number is?
a)
√
x
2
-y
2
b)
√
x
2
+y
2
c)
√
x
2
y
2
d) None of these
2.
If Z
1
& Z
2
are two complex numbers then
1
+ Z
2
is ?
a) Z
1
+ Z
2
b)
`
Z
1
-
`
Z
2
c)
`
Z
1
+
`
Z
2
d) None of these
3.
If Z
1
& Z
2
are two complex numbers then
1
-Z
2
is?
a) Z
1
+ Z
2
b)
`
Z
1
-
`
Z
2
c)
`
Z
1
+
`
Z
2
d) None of these
4.
If Z
1
& Z
2
are two complex numbers then
Z
1
Z
2
is?
a) Z
1
Z
2
b) Z
1
/Z
2
c)
`
Z
1
.
`
Z
2
d) None of these
5.
If Z
1
& Z
2
are two complex numbers then
(Z1
1
/ Z
2
)
is?
a) [Z1
1
/ Z
2
]
b) Z
1
Z
2
c)
`
Z
1
/
`
Z
2
d) None of these
6.
If Z
1
& Z
2
are two complex numbers then |Z1
1
Z
2
| is?
a) Z
1
/ Z
2
b) |Z
1
| / |Z
2
|
c) |Z
1
| |Z
2
|
d) None of these
7.
If Z is a complex number and
`
Z is a conjugate then Z
`
Z is equal to?
a) |Z| |
`
Z
b) |Z
2
|
c) |Z| / |Z|
d) None of these
8.
(x + iy)
2
= _?
a) x
2
+y
2
+ 2xyi
b) x
2
-y
2
-2xyi
c) x
2
-y
2
+2xyi
d) None of these
9.
(x-iy)
2
?
a) x
2
+y
2
+2xyi
b) x
2
-y
2
+2xyi
c) x
2
+y
2
-2xyi
d) None of these
10.
Z
2
+
`
Z
2
is a?
a) Complex number
b) Real number
c) Both (a) &-(b)
d) None of these
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