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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