Let $a = \operatorname { Im } \left( \frac { 1 + z ^ { 2 } } { 2 i z } \right)$, where $z$ is any non-zero complex number. The set $\mathrm { A } = \{ a : | z | = 1$ and $z \neq \pm 1 \}$ is equal to: (1) $( - 1,1 )$ (2) $[ - 1,1 ]$ (3) $[ 0,1 )$ (4) $( - 1,0 ]$
If $a _ { 1 } , a _ { 2 } , a _ { 3 } , \ldots , a _ { n } , \ldots$ are in A.P. such that $a _ { 4 } - a _ { 7 } + a _ { 10 } = m$, then the sum of first 13 terms of this A.P., is : (1) 10 m (2) 12 m (3) 13 m (4) 15 m
Let $\theta _ { 1 }$ be the angle between two lines $2 x + 3 y + c _ { 1 } = 0$ and $- x + 5 y + c _ { 2 } = 0$ and $\theta _ { 2 }$ be the angle between two lines $2 x + 3 y + c _ { 1 } = 0$ and $- x + 5 y + c _ { 3 } = 0$, where $c _ { 1 } , c _ { 2 } , c _ { 3 }$ are any real numbers: Statement-1: If $c _ { 2 }$ and $c _ { 3 }$ are proportional, then $\theta _ { 1 } = \theta _ { 2 }$. Statement-2: $\theta _ { 1 } = \theta _ { 2 }$ for all $c _ { 2 }$ and $c _ { 3 }$. (1) Statement-1 is true, Statement-2 is true; Statement-2 is a correct explanation of Statement-1. (2) Statement-1 is true, Statement-2 is true; Statement-2 is not a correct explanation of Statement-1. (3) Statement-1 is false; Statement-2 is true. (4) Statement-1 is true; Statement-2 is false.
The point of intersection of the normals to the parabola $y ^ { 2 } = 4 x$ at the ends of its latus rectum is : (1) $( 0,2 )$ (2) $( 3,0 )$ (3) $( 0,3 )$ (4) $( 2,0 )$
If the median and the range of four numbers $\{ x , y , 2 x + y , x - y \}$, where $0 < y < x < 2 y$, are 10 and 28 respectively, then the mean of the numbers is : (1) 18 (2) 10 (3) 5 (4) 14
If the extremities of the base of an isosceles triangle are the points $( 2 a , 0 )$ and $( 0 , a )$ and the equation of one of the sides is $x = 2 a$, then the area of the triangle, in square units, is : (1) $\frac { 5 } { 4 } a ^ { 2 }$ (2) $\frac { 5 } { 2 } a ^ { 2 }$ (3) $\frac { 25 a ^ { 2 } } { 4 }$ (4) $5 a^2$