jee-advanced

2005 mains

10 maths questions

Q9 Vectors Introduction & 2D Expressing a Vector as a Linear Combination View
9. Incident ray is along the unit vector v and the reflected ray is along the unit vector w . The normal is along unit vector a outwards. Express vector $w$ in terms of vector $a$ and $v$.
10. Tangents are drawn from any point on the hyperbola $x ^ { 2 } / 9 - y ^ { 2 } / 4 = 1$ to the circle $x ^ { 2 } + y ^ { 2 } = 9$. Find the locus of mid-point of the chord of contact.
11. Find the equation of the common tangent in 1st quadrant to the circle $x ^ { 2 } + y ^ { 2 } = 16$ and the ellipse $x ^ { 2 } / 25 + y ^ { 2 } / 4 = 1$. Also find the length of the intercept of the tangent between the coordinate axes.
Q12 Differential equations Solving Separable DEs with Initial Conditions View
12. If length of tangent at any point on the curve $y = f ( x )$ intercepted between the point and the $x$-axis is of length 1 . Find the equation of the curve.
Q13 Areas Between Curves Area Involving Conic Sections or Circles View
13. Find the area bounded by the curves $x ^ { 2 } = y , x ^ { 2 } = - y$ and $y ^ { 2 } = 4 x - 3$.
14. If one of the vertices of the square circumscribing the circle $| z - 1 | = \sqrt { } 2$ is $2 + \sqrt { } 3 \mathrm { i }$. Find the other vertices of square.
15. If $f ( x - y ) = f ( x ) \cdot g ( y ) - f ( y ) \cdot g ( x )$ and $g ( x - y ) = g ( x ) \cdot g ( y ) + f ( x ) \cdot f ( y )$ for all $x$, $y \hat { I } R$. If right hand derivative at $x = 0$ exists for $f ( x )$. Find derivative of $g ( x )$ at $x = 0$.
Q16 Stationary points and optimisation Determine parameters from given extremum conditions View
16. If $p ( x )$ be a polynomial of degree 3 satisfying $p ( - 1 ) = 10 , p ( 1 ) = - 6$ and $p ( x )$ has maximum at $x = - 1$ and $p ^ { \prime } ( x )$ has minima at $x = 1$. Find the distance between the local maximum and local minimum of the curve.
17. $f ( x )$ is a differentiable function and $g ( x )$ is a double differentiable function such that $| f ( x ) | < 1$ and $f ^ { \prime } ( x ) = g ( x )$. If $f ^ { 2 } ( 0 ) + g ^ { 2 } ( 0 ) = 0$. Prove that there exists some $c \hat { I } ( - 3,3 )$ such that $\mathrm { g } ( \mathrm { c } ) . \mathrm { gn } ( \mathrm { c } ) < 0$.
Q18 Solving quadratics and applications Determining quadratic function from given conditions View
18. If
$$\left[ \begin{array} { l l l } 4 a ^ { 2 } & 4 a & 1 \\ 4 b ^ { 2 } & 4 b & 1 \\ 4 c ^ { 2 } & 4 c & 1 \end{array} \right] \left[ \begin{array} { c } f ( - 1 ) \\ f ( 1 ) \\ f ( 2 ) \end{array} \right] = \left[ \begin{array} { l l l } 3 a ^ { 2 } & + & 3 a \\ 3 b ^ { 2 } & + & 3 b \\ 3 c ^ { 2 } & + & 3 c \end{array} \right] ,$$
$f ( x )$ is a quadratic function and its maximum value occurs at a point $V$. $A$ is a point of intersection of $y = f ( x )$ with $x$-axis and point $B$ is such that chord $A B$ subtends a right angle at V . Find the area enclosed by $\mathrm { f } ( \mathrm { x } )$ and chord AB .