6. Which one is not a root of the fourth root of unity.

(a) i

(b) 1

(c) i/√2

(d) -i

7. If z^{3} – 2z^{2 }+ 4z – 8 = 0 then :

(a) |z| = 1

(b) |z| = 2

(c) |z| = 3

(d) none

8. i^{1} + i^{2} + i^{3} + i^{4} + ……… + i^{1000} =

(a) 0

(b) 1

(c) -1

(d) none

9. If the cube roots of unity are 1,ω,ω^{2} then 1 + ω + ω^{2 }=

(a) 0

(b) 1

(c) -1

(d) ω

10. The small positive integer ‘n’ for which (1+i)^{2n }= (1-i)^{2n }is :

(a) 2

(b) 4

(c) 8

(d) 12

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