## Cube Roots of Unity, nth Roots of Unity MCQ Basic level

Compared to other sections, mathematics is considered to be the most scoring section. If prepared thoroughly, mathematics can help students to secure a meritorious position in the exam. These questions are very important in achieving your success in Exams after 12th.

Q1.

The product of cube roots of –1 is equal to
•  0
•  1
•  -1
•  None of these

-1

Q2. The two numbers such that each one is square of the other, are

•  w,w3
•  – i, i
•  –1, 1
•  w,w2

w,w2

Q3. The value of (8)1/3 is

•  -1+i/3
•  -1-i/3
•  2
•  All of these

All of these

Q4. If w(not equal to 1) is a cube root of unity and (1+w)7 then A and B are respectively, the numbers

•  0,1
•  1,0
•  1,1
•  -1,1

1,1

Q5. cube root of 1 is w , then the value of (3+w+3w2)4 is

•  0
•  16
•  16w
•  16w2

16w

Q6. If 1,ww2 are the three cube roots of unity, then (3+w2+w4)6 =

•  64
•  729
•  2
•  0

64

Q7. If w is a non real cube root of unity, then (a+b)(a+bw)(a+bw2)is

•  (a3+b3)
•  (a3-b3)
•  (a2+b2)
•  (a2-b2)

(a3+b3)

Q8. If w is an imaginary cube root of unity, then (1+w-w2)7 equals of

•  128w
•  -128w
•  128w2
•  -128w2

-128w2

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