1. The value of √(-16) is
2. The value of √(-144) is
3. The value of √(-25) + 3√(-4) + 2√(-9) is
4. if z lies on |z| = 1, then 2/z lies on
5. If ω is an imaginary cube root of unity, then (1 + ω – ω²)7 equals
6. The least value of n for which {(1 + i)/(1 – i)}n is real, is
7. Let z be a complex number such that |z| = 4 and arg(z) = 5π/6, then z =
8. The value of i-999 is
9. Let z1 and z2 be two roots of the equation z² + az + b = 0, z being complex. Further assume that the origin, z1 and z1 form an equilateral triangle. Then
10. The complex numbers sin x + i cos 2x are conjugate to each other for