Complex Number 5 Important MCQ Part 1

 

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   • 1. What is the square root of -1 in the context of complex numbers?

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     • A) 0
     • B) 1
     • C) -1
     • D) i
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     • Correct Option: D) i

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   • 2. In the complex number $�+��$, what does 'a' represent?

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     • A) Real part
     • B) Imaginary part
     • C) Conjugate part
     • D) Exponential part
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     • Correct Option: A) Real part

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   • 3. Which complex number represents the additive inverse of $-3+4�$?

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     • A) $3-4�$
     • B) $-3-4�$
     • C) $3+4�$
     • D) $-3+4�$
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     • Correct Option: B) $-3-4�$

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   • 4. What is the product of (2 + 3i) and (1 - 2i)?

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     • A) $4+7�$
     • B) $8-�$
     • C) $-8+�$
     • D) $8+5�$
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     • Correct Option: A) $4+7�$

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   • 5. Which formula represents the modulus (magnitude) of a complex number $�+��$?

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     • A) $\sqrt{{�}^2-{�}^2}$
     • B) $\sqrt{}$�2+�2
     • C) $\sqrt{�}+\sqrt{�}$
     • D) $\sqrt{�}-\sqrt{�}$
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     • Correct Option: B) $\sqrt{{�}^2+{�}^2}$