Complex Numbers and Quadratic Equations

---

Question

---

Question 1 :

The value of √(-16) is

1. -4i
2. 4i
3. -2i
4. 2i
Answer
7937

Question 2 :

The value of √(-144) is

1. 12i
2. -12i
3. ±12i
4. None of these
Answer
7938

Question 3 :

The value of √(-25) + 3√(-4) + 2√(-9) is

1. 13i
2. -13i
3. 17i
4. -17i
Answer
7939

Question 4 :

if z lies on |z| = 1, then 2/z lies on

1. a circle
2. an ellipse
3. a straight line
4. a parabola
Answer
7940

Question 5 :

If ω is an imaginary cube root of unity, then (1 + ω – ω²)⁷ equals

1. 128 ω
2. -128 ω
3. 128 ω²
4. -128 ω²
Answer
7941