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Class 11 Mathematics — Chapter 5: Complex Numbers and Quadratic Equations
66 practice questions · 22 Easy · 22 Medium · 22 Hard
Free NCERT-aligned multiple-choice practice for Class 11 Mathematics, Chapter 5 (Complex Numbers and Quadratic Equations). Practise timed Easy, Medium and Hard quizzes with instant explanations — built for CBSE Board exams, JEE Main and NEET UG. Here are a few sample questions; sign in free to practise all 66.
Sample questions
Q1Easy
|3 + 4i| =
A.5✓ correct
B.7
C.√7
D.12
Why
√(9 + 16) = 5.
Q2Medium
i¹⁰⁰ =
A.1✓ correct
B.−1
C.i
D.−i
Why
100 = 4·25 ⇒ i¹⁰⁰ = 1.
Q3Hard
Conjugate of 2−3i:
A.2+3i✓ correct
B.−2+3i
C.−2−3i
D.3−2i
Why
Flip the imaginary sign.
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