This quiz works best with JavaScript enabled. Home > Cbse > Class 11 > Science > Mathematics > Class 11 Mathematics Chapter 5 Complex Numbers And Quadratic Equations – Quiz 3 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Mathematics Chapter 5 Complex Numbers And Quadratic Equations Quiz 3 (6 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. In complex number $z=3-2i$ A) $2$. B) $-3$. C) $3$. D) $-2$. Show Answer Correct Answer: C) $3$. 2. If a + ib = c + id, then A) A$^{2}$ + c$^{2}$ = 0. B) B$^{2}$ + c$^{2}$ = 0. C) B$^{2}$ + d$^{2}$ = 0. D) A$^{2}$ + b$^{2}$ = c$^{2}$ + d$^{2}$. Show Answer Correct Answer: D) A$^{2}$ + b$^{2}$ = c$^{2}$ + d$^{2}$. 3. Solve using the Quadratic Formula:$-20x=4x^2+25$ A) $x=-\frac{5}{2}$. B) $x=\frac{20\pm20\sqrt{2}}{-8}$. C) $x=\frac{-10\pm10\sqrt{2}}{5}$. D) $x=\pm\frac{5}{2}$. Show Answer Correct Answer: A) $x=-\frac{5}{2}$. 4. Multiply. (2+3i)(2+3i) A) 13. B) -5. C) 13 + 12i. D) -5 + 12i. Show Answer Correct Answer: D) -5 + 12i. 5. Solve:2(x-3)$^{2}$-14 = 18 A) -1, 7. B) 1, 7. C) 1, -7. D) -1, -7. Show Answer Correct Answer: A) -1, 7. 6. Which pair of numbers are *complex conjugates*? A) $-2+7i$ $-2-7i$. B) $5+\sqrt{3}$ $5-\sqrt{3}$. C) $2+3i$ $-2-3i$. D) $3+4i$ $-3-4i$. Show Answer Correct Answer: A) $-2+7i$ $-2-7i$. ← PreviousRelated QuizzesScience QuizzesClass 11 QuizzesClass 11 Mathematics Chapter 5 Complex Numbers And Quadratic Equations Quiz 1Class 11 Mathematics Chapter 5 Complex Numbers And Quadratic Equations Quiz 2Class 11 Mathematics Chapter 1 Sets QuizClass 11 Mathematics Chapter 10 Straight Lines QuizClass 11 Mathematics Chapter 11 Conic Sections QuizClass 11 Mathematics Chapter 12 Introduction To Three Dimensional Geometry QuizClass 11 Mathematics Chapter 13 Limits And Derivatives QuizClass 11 Mathematics Chapter 14 Mathematical Reasoning Quiz 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books