Unit 1: Real And Complex Numbers - Mathematics For Class IX (Science Group) - Multiple Choice Questions (MCQs)

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Unit 1: Real And Complex Numbers
Multiple Choice Questions (MCQs)

Choose the correct answer:
1. Which of the following represents the set of complex numbers?
(a) R
(b) C
(c) N
(d) Z ✔

2. If Z = 3 + 4i, what is the modulus of Z?
(a) 5 ✔
(b) 7
(c) 9
(d) 16

3. The additive identity in R is:
(a) 1
(b) 0 ✔
(c) 2
(d) None of these

4. 5+(6+7)=(5+6)+7
: (a) 5
(b) 6
(c) 7 ✔
(d) 9

5. 3+(-3)=___:
(a) 1
(b) 0 ✔
(c) 2
(d) 3

6. π is a which number:
(a) rational
(b) irrational ✔
(c) whole
(d) None of these

7. ²²/₇ is a which number.
(a) rational ✔
(b) irrational
(c) whole
(d) None of these

8. The conjugate of −3 + 5i is:
(a) -3 - 5i ✔
(b) 3 - 5i
(c) 3 + 5i
(d) None of these

9. In 2i(3-i), the real part is:
(a) 2 ✔
(b) 3
(c) i
(d) None of these

10. The imaginary part of the complex number Z = −5 + 2i is:
(a) -5
(b) 2 ✔
(c) -2
(d) 5

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