1
AP EAPCET 2025 - 27th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The coordinate axes are rotated about the origin in the counter clockwise direction through an angle $60^{\circ}$. If a and $b$ are the intercepts made on the new axes by a straight line whose equation referred to the original axes is $x+y=1$, then $\frac{1}{a^2}+\frac{1}{b^2}=$

A

2

B

3

C

4

D

6

2
AP EAPCET 2025 - 27th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The image of a point $(2,-1)$ with respect to the line $x-y+1=0$ is

A

$(2,-3)$

B

$(-2,3)$

C

$(0,1)$

D

$(-1,0)$

3
AP EAPCET 2025 - 27th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

If a straight line is at a distance of 10 units from the origin and the perpendicular drawn from the origin to it makes an angle $\frac{\pi}{4}$ with the negative $X$-axis in the negative direction, then the equation of that line is

A

$x+y+10 \sqrt{2}=0$

B

$x-y-10 \sqrt{2}=0$

C

$x+y-10 \sqrt{2}=0$

D

$x-y+10 \sqrt{2}=0$

4
AP EAPCET 2025 - 27th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

If one of the lines given by the pair of lines $3 x^2-2 y^2+a x y=0$ is making an angle $60^{\circ}$ with $X$-axis, then $a=$

A

$\sqrt{3}$

B

$\frac{1}{\sqrt{3}}$

C

3

D

$\frac{1}{3}$