In This Post we are providing Chapter-5 COMPLEX NUMBERS AND QUADRATIC EQUATIONS NCERT MOST IMPORTANT QUESTIONS for Class 11 MATHS which will be beneficial for students. These solutions are updated according to 2021-22 syllabus. These MCQS can be really helpful in the preparation of Board exams and will provide you with a brief knowledge of the chapter.
NCERT MOST IMPORTANT QUESTIONS ON COMPLEX NUMBERS AND QUADRATIC EQUATIONS
1. Evaluate i-39
Ans. 
2. Solved the quadratic equation
Ans. 
3. If = 1, then find the least positive integral value of m.
Ans. 
4. Evaluate (1+ i)4
Ans. 
5. Find the modulus of
Ans. Let z = 
6. Express in the form of a + ib. (1+3i)-1
Ans. 
7. Explain the fallacy in -1 = i. i. =
Ans. 
is okay but
is wrong.
8. Find the conjugate of
Ans. Let z = 
9. Find the conjugate of – 3i – 5.
Ans. Let z = 3i – 5
10. Let z1 = 2 – i, z2 = -2+i Find Re
Ans. z1 z2 = (2 – i)(-2 + i)
11. Express in the form of a + ib (3i-7) + (7-4i) – (6+3i) + i23
Ans. Let
Z = 
12. Find the conjugate of
Ans. 
13. Solve for x and y, 3x + (2x-y) i= 6 – 3i
Ans. 3x = 6
x = 2
2x – y = – 3
2 × 2 – y = – 3
– y = – 3 – 4
y = 7
14. Find the value of 1+i2 + i4 + i6 + i8 + —- + i20
Ans.
15. Multiply 3-2i by its conjugate.
Ans.Let z = 3 – 2i
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