Section A — MCQ (Single Correct)
Question 1
If the line $y = mx + \sqrt{a^2m^2-b^2}$ touches the hyperbola $\ds\frac{x^2}{a^2} - \frac{y^2}{b^2} = 1$ at an eccentricity boundary where $b^2 = 3a^2$, find the real range of slopes $m$ for which a real tangent line can be constructed:
A
$|m| > \sqrt{3}$
B
$|m| < \sqrt{3}$
C
$|m| > 3$
D
All real values of $m$ are valid
Question 2
Find the equation of the chord of contact drawn from the external point $P(1, 4)$ to the standard conjugate hyperbola mapping $\ds\frac{x^2}{9} - \frac{y^2}{16} = -1$:
A
$\ds\frac{x}{9} - \frac{y}{4} = -1$
B
$\ds\frac{x}{9} - \frac{y}{4} = 1$
C
$\ds\frac{x}{9} + \frac{y}{4} = -1$
D
$16x - 9y + 144 = 0$
Question 3
If the eccentricities of a hyperbola and its corresponding conjugate hyperbola are $e_1$ and $e_2$ respectively, and $e_1 = \sqrt{3}$, find the value of $e_2$:
A
$\ds\sqrt{\frac{3}{2}}$
B
$\ds\sqrt{3}$
C
$\ds\frac{\sqrt{6}}{2}$
D
$2$
Question 4
A tangent line to the hyperbola $\ds\frac{x^2}{a^2} - \frac{y^2}{b^2} = 1$ at the parameter point $\theta$ cuts the asymptotes at $A$ and $B$. The geometric center $C(0,0)$ forms a triangle $CAB$ whose total area is:
A
$ab$
B
$2ab$
C
$\ds\frac{1}{2}ab$
D
$a^2 + b^2$
Question 5
Find the coordinate position of the focus of the rectangular hyperbola configuration modeled by the product formula $xy = 8$:
A
$(4, 4)$ and $(-4, -4)$
B
$(2\sqrt{2}, 2\sqrt{2})$ and $(-2\sqrt{2}, -2\sqrt{2})$
C
$(4\sqrt{2}, 4\sqrt{2})$ and $(-4\sqrt{2}, -4\sqrt{2})$
D
$(2, 2)$ and $(-2, -2)$
Question 6
The locus of the foot of the perpendicular dropped from the focus $S(ae, 0)$ to any variable tangent line of the hyperbola $\ds\frac{x^2}{a^2} - \frac{y^2}{b^2} = 1$ matches which curve?
A
$x^2 + y^2 = a^2$
B
$x^2 + y^2 = a^2 - b^2$
C
$x^2 + y^2 = a^2 + b^2$
D
$x = \ds\frac{a}{e}$
Question 7
Find the equation of the normal line to the rectangular hyperbola $xy = 4$ at the parameter point $t = 1$:
A
$x - y = 0$
B
$x + y = 4$
C
$x + y = 0$
D
$x - y = 4$
Question 8
For what value of the intercept constant $c$ is the straight line $y = 3x + c$ tangent to the hyperbola $\ds\frac{x^2}{4} - \frac{y^2}{9} = 1$?
A
$\pm 3\sqrt{3}$
B
$\pm 3\sqrt{2}$
C
$\pm \sqrt{27}$
D
$\pm \sqrt{45}$
Question 9
If a circle cuts a rectangular hyperbola $xy = c^2$ at four points parameterized by $t_1, t_2, t_3,$ and $t_4$, the parameter product $t_1 t_2 t_3 t_4$ is identically:
A
$1$
B
$-1$
C
$c^4$
D
$0$
Question 10
The acute angle between the two asymptotes of a standard hyperbola whose semi-axes satisfy $b = a$ is exactly:
A
$90^\circ$
B
$60^\circ$
C
$45^\circ$
D
$30^\circ$
Section B — Integer Type
Question 11 — Integer answer
Find the radius value of the director circle for the hyperbola $\ds\frac{x^2}{16} - \frac{y^2}{7} = 1$.
Question 12 — Integer answer
If the normal line drawn at parameter point $t = 2$ on the rectangular hyperbola $xy = c^2$ meets the curve again at a new parameter point $t'$, find the integer magnitude value of the denominator $k$ if $t' = -\ds\frac{1}{k}$.
Question 13 — Integer answer
Calculate the total number of real normal lines that can be drawn from the geometric center $(0,0)$ to a standard non-equilateral hyperbola.
Section C — Assertion & Reasoning
Question 14 — Assertion / Reason
Assertion (A): The eccentricity of any rectangular hyperbola curve configuration is a fixed scalar constant equal to $\sqrt{2}$.
Reason (R): For a rectangular hyperbola, the lengths of the semi-axes are equal ($a = b$), which simplifies the eccentricity identity to $e^2 = 1 + \ds\frac{a^2}{a^2} = 2$.
A
Both A and R are true and R is the correct explanation of A
B
Both A and R are true but R is NOT the correct explanation of A
C
A is true but R is false
D
A is false but R is true
Solution: Both A and R are true, and R is the correct explanation.
Question 15 — Assertion / Reason
Assertion (A): No real director circle can be constructed for the standard hyperbola equation $\ds\frac{x^2}{9} - \frac{y^2}{16} = 1$.
Reason (R): The director circle radius expression matches $\sqrt{a^2 - b^2}$, which evaluates to an imaginary value $\sqrt{9 - 16} = \sqrt{-7}$ when $a < b$.
A
Both A and R are true and R is the correct explanation of A
B
Both A and R are true but R is NOT the correct explanation of A
C
A is true but R is false
D
A is false but R is true
Solution: Both A and R are true, and R is the correct explanation.