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Important Questions

Complex Numbers

ICSE · Class 11 · Mathematics

Most important questions from Complex Numbers for ICSE Class 11 Mathematics board exam 2026. MCQs, short answer, and long answer questions with marks.

100 questions30 flashcards5 concepts

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A diagram illustrating the components of a complex number z = a + ib, clearly labeling the real part 'a', the imaginary part 'b', and the imaginary unit 'i'.
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100 Questions·
multiple choicetrue false

Sample Questions

1multiple choice
1 marks

For z = 5 + 3i, what is Re(z)?

Show answer

5

In z = a+ib, Re(z) = a = 5. The real part is the coefficient without i.

2multiple choice
1 marks

For z = 5 + 3i, what is Im(z)?

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3

In z = a+ib, Im(z) = b = 3 (not 3i). The imaginary part is the coefficient of i, not b times i.

3multiple choice
1 marks

What is the conjugate of z = 4 + 7i?

Show answer

4 − 7i

The conjugate z̄ = a − ib changes only the sign of the imaginary part. So z̄ = 4 − 7i.

4multiple choice
1 marks

What is |3 + 4i|?

Show answer

5

|z| = √(a²+b²) = √(9+16) = √25 = 5.

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Frequently Asked Questions

What are the important topics in Complex Numbers for ICSE Class 11 Mathematics?
Key topics in Complex Numbers include Process for solving equations with complex solutions, Comprehensive overview of complex numbers chapter content, Comprehensive overview of complex numbers chapter content. These are the concepts ICSE Class 11 examiners draw on most — study them first, then practise related questions.
How to score full marks in Complex Numbers — ICSE Class 11 Mathematics?
Understand the core concepts first, then work through the 100 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many important questions are there in Complex Numbers?
There are 100 practice questions available for Complex Numbers. These cover multiple question types including MCQs, short answer, and long answer questions.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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