1
AP EAPCET 2025 - 21st May Morning Shift
MCQ (Single Correct Answer)
+1
-0

If $z_1$ and $z_2$ are two of the $n$th roots of unity such that the line segment joining them subtends at a right angle at the origin, then for a positive integer $k, n$ takes the form

A

$4 k$

B

$4 k+1$

C

$4 k+2$

D

$4 k+3$

2
AP EAPCET 2025 - 21st May Morning Shift
MCQ (Single Correct Answer)
+1
-0

$$ (\sqrt{\sqrt{2}+1}+i \sqrt{\sqrt{2}-1})^8= $$

A

64

B

$64 i$

C

-64

D

$-64 i$

3
AP EAPCET 2025 - 21st May Morning Shift
MCQ (Single Correct Answer)
+1
-0

If the harmonic mean of the roots of the equation $\sqrt{2} x^2-b x+(8-2 \sqrt{5})=0$ is

A

3

B

2

C

$4-\sqrt{5}$

D

$4+\sqrt{5}$

4
AP EAPCET 2025 - 21st May Morning Shift
MCQ (Single Correct Answer)
+1
-0

All the values of $k$ such that the quadratic expression $2 k x^2-(4 k+1) x+2$ is negative for exactly three integrals values of $x$, lie in the interval

A

$\left[\frac{1}{12}, \frac{1}{10}\right)$

B

$\left(\frac{1}{6}, \frac{1}{5}\right)$

C

$[-1,2)$

D

$[2,6)$