Complex Numbers · NDA previous year questions

2017 2 questions

1. Q62017 · 23 Apr 2017

   The modulus and principal argument of the complex number $\frac{1+2i}{1-(1-i{)}^2}$ are respectively

   1. A.1, 0
   2. B.1, 1
   3. C.2, 0
   4. D.2, 1
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   Answer: A

2. Q152017 · 23 Apr 2017

   If the graph of a quadratic polynomial lies entirely above $x$-axis, then which one of the following is correct?

   1. A.Both the roots are real
   2. B.One root is real and the other is complex
   3. C.Both the roots are complex
   4. D.Cannot say
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   Answer: C