Q1: 1. What is the square root of -16?

• A) 2i
• B) -4
• C) 4i
• D) -2i

Q2: 2. Which of the following is a complex number?

• A) 5
• B) √3
• C) -2
• D) 2i

Q3: 3. What is the conjugate of the complex number 3 + 4i?

• A) 3 - 4i
• B) -3 + 4i
• C) -3 - 4i
• D) 3 - 4

Q4: 4. Which of the following is a solution to the quadratic equation x^2 + 4 = 0?

• A) 2
• B) -2
• C) 2i
• D) -2i

Q5: 5. What is the absolute value of the complex number -3 - 4i?

• A) 7
• B) 5
• C) 3
• D) 4

Q6: 6. Which of the following is a solution to the equation x^2 + 9 = 0?

• A) 3i
• B) -3
• C) ±3i
• D) 3

Q7: 7. What is the product of (2 + 3i) and (1 - i)?

• A) 1 + 5i
• B) 5 - i
• C) 5 + i
• D) 1 - 5i

Q8: 8. Which of the following is a solution to the equation x^2 + 1 = 0?

• A) 1
• B) -1
• C) 1i
• D) -1i

Q9: 9. What is the real part of the complex number 2 + 3i?

• A) 2
• B) 3
• C) 5
• D) 2i

Q10: 10. Which of the following is a solution to the quadratic equation x^2 + 16 = 0?

• A) 4i
• B) -4
• C) 4
• D) -4i

Q11: 11. What is the square of the complex number 1 + i?

• A) 1
• B) 2i
• C) -1
• D) 2

Q12: 12. Which of the following is a solution to the equation x^2 - 4 = 0?

• A) 2
• B) -2
• C) 2i
• D) -2i

Q13: 13. What is the modulus of the complex number 4 - 3i?

• A) 7
• B) 5
• C) 4
• D) 3

Q14: 14. Which of the following is a solution to the equation x^2 + 25 = 0?

• A) 5i
• B) -5
• C) 5
• D) -5i

Q15: 15. What is the product of (1 + 2i) and (3 - i)?

• A) 3 + 5i
• B) 3 - 5i
• C) -1 + 5i
• D) -1 - 5i

Q16: 16. Which of the following is a solution to the quadratic equation x^2 + 36 = 0?

• A) 6
• B) -6
• C) 6i
• D) -6i

Q17: 17. What is the conjugate of the complex number 5 - 2i?

• A) 5 + 2i
• B) -5 + 2i
• C) -5 - 2i
• D) 5 - 2i

Q18: 18. Which of the following is a solution to the equation x^2 + 49 = 0?

• A) 7i
• B) -7
• C) 7
• D) -7i

Q19: 19. What is the absolute value of the complex number 2 + 5i?

• A) √29
• B) 7
• C) 5
• D) 2

Q20: 20. Which of the following is a solution to the quadratic equation x^2 + 64 = 0?

• A) 8i
• B) -8
• C) 8
• D) -8i

Q21: 21. What is the product of (4 + 2i) and (3 - 2i)?

• A) 8 + 10i
• B) 6 + 4i
• C) 10 + 8i
• D) 8 - 10i

Q22: 22. Which of the following is a solution to the equation x^2 + 81 = 0?

• A) 9i
• B) -9
• C) 9
• D) -9i

Q23: 23. What is the square of the complex number 2 + 2i?

• A) 4
• B) 2 + 4i
• C) -4
• D) 4i

Q24: 24. Which of the following is a solution to the quadratic equation x^2 + 100 = 0?

• A) 10i
• B) -10
• C) 10
• D) -10i

Q25: 25. What is the conjugate of the complex number 6 - 3i?

• A) 6 + 3i
• B) -6 + 3i
• C) -6 - 3i
• D) 6 + 3