9th class Mathematics Online test Unit 2- Real and complex Number

Unit 2 – Real and Complex Numbers

Quiz

 

1. The square root of − 9 −9 is represented as:
   1.   3
   2.   -3
   3.   3i
   4.   -3i
2. What is �� 2 i 2 equal to?
   1.   −1
   2.   1
   3.   0
   4.   i
3. The set of real numbers is denoted by:
   1.   C
   2.   R
   3.   Z
   4.   N
4. Simplify ( 3 + 2 �� ) − ( 1 + 4 �� ) (3+2i)−(1+4i):
   1.   2−2i
   2.   4+6i
   3.   2+6i
   4.   4-6i
5. The product of ( 2 + 3 �� ) (2+3i) and ( 1 − �� ) (1−i) is:
   1.   2−i
   2.   5+i
   3.   5 +5i
   4.   −1+5i
6. Which of the following represents a complex number?
   1.   5
   2.   -3
   3.   2i
   4.   4+3i
7. The additive inverse of 7 + 4 �� 7+4i is:
   1.   −7−4i
   2.   7−4i
   3.   −7+4i
   4.   7+4i
8. If �� = 3 + 4 �� z=3+4i, then the modulus of �� z is:
   1.   3
   2.   4
   3.   5
   4.   7
9. What is the real part of 5 + 6 �� 5+6i?
   1.   6
   2.   5
   3.   11
   4.   0
10. Two complex numbers are equal if and only if:
    1.   Their real parts are equal.
    2.   Their imaginary parts are equal.
    3.   Both real and imaginary parts are equal.
    4.   None of these.