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#### Aptitude : : Complex Number Questions & Answers

1. $|Z_1+Z_2|=?$

A. $\leq Z_1+Z_2$

B. $\leq|Z_1|+|Z_2|$

C. $> Z_1+Z_2$

D. $>|Z_1|+|Z_2|$

1. Polar form of a complex number is :

A. r(sinθ + i cosθ)

B. r(tanθ + i cotθ)

C. r(secθ + i cosecθ)

D. r(cosθ + i sinθ)

1. If Z1 = 2 + i and Z2 = 1 + 3i, then iRe(Z1 - Z2)

A. 1

B. i

C. 2i

D. 2

1. a2 + b2 = ?

A. (a - ib)(a + ib)

B. (a - b)(a + b)

C. (a - b)(a + ib)

D. (a - ib)(a + b)

1. In the equation x2 + 144 = 0, x is equal to which of the following ?

A. -12

B. No Solution

C. 12

D. 12i