[{"id":19733,"question":"The cube roots of unity&nbsp;ω = -------------------------","choices":[{"text":"1-i&nbsp;√-3 / 2","value":"A"},{"text":"-1+i&nbsp;√-3 / 2i","value":"B"},{"text":"-1+i&nbsp;√3 / 2","value":"C"},{"text":"1+i&nbsp;√3 / 2","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":19732,"question":"One of the roots of the equation 2x<sup>2</sup> + 3x + n = 0 is the reciprocal of the other, then n = --------------------","choices":[{"text":"Both A,B have the same number of columns","value":"A"},{"text":"Both A,B do not have the same order","value":"B"},{"text":"Number of col A is same as number of rows of B","value":"C"},{"text":"Number of rows of A is same as number of col of B","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":19731,"question":"The degree of the polynomial 2x<sup>4</sup> + 3x<sup>2</sup> + 16x + 28 = x<sup>4</sup> + 2x<sup>2</sup> is","choices":[{"text":"[a<sub>ij - </sub>b<sub>ji</sub>]","value":"A"},{"text":"[a<sub>ij -&nbsp;</sub>b<sub>ij</sub>]","value":"B"},{"text":"[a<sub>ij -&nbsp;</sub>b<sub>ij</sub>]","value":"C"},{"text":"[a<sub>ij] - [</sub>b<sub>ij</sub>]","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":19730,"question":"If&nbsp;α and&nbsp;β&nbsp;be irrational roots of a quadratic equation, then","choices":[{"text":"α = b/a and&nbsp;β = ca","value":"A"},{"text":"α = a/b and&nbsp;β = -c/a","value":"B"},{"text":"α<sup>2</sup> +&nbsp;β<sup>2</sup> = 1","value":"C"},{"text":"α = -b/a and&nbsp;β= c/a","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":19729,"question":"An m x n matrix is said to be rectangular if","choices":[{"text":"Forms a group w.r.t. addition","value":"A"},{"text":"Non commutative group w.r.t. multiplication","value":"B"},{"text":"Forms a group w.r.t. multiplication","value":"C"},{"text":"Doesn't form a group","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":19728,"question":"If the order of A is n x m. Then order of kA is","choices":[{"text":"Forms a group","value":"A"},{"text":"Does not form a group","value":"B"},{"text":"Contains no additive identity","value":"C"},{"text":"Contains no additive inverse","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":19727,"question":"If A and B are matrices such that AB=BA=I then","choices":[{"text":"A and B are multiplicative inverse of each other","value":"A"},{"text":"A and B are additive inverses of each other","value":"B"},{"text":"A and B are singular matrices","value":"C"},{"text":"A and B are equal","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":19726,"question":"If any two rows (or any two columns) of a square matrix are inter changed, the determinant of the resultant matrix is","choices":[{"text":"True","value":"A"},{"text":"False","value":"B"},{"text":"Fallacious","value":"C"},{"text":"Some times true","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":19725,"question":"In general matrices do not satisfy","choices":[{"text":"Not a group","value":"A"},{"text":"A group w.r.t. subtraction","value":"B"},{"text":"A group w.r.t. division","value":"C"},{"text":"A group w.r.t. multiplication","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":19724,"question":"If A and B are matrices of same order than (A + B)(A + B)=","choices":[{"text":"addition","value":"A"},{"text":"multiplication","value":"B"},{"text":"subtraction","value":"C"},{"text":"None","value":"D"},{"value":"E"}],"correctAnswer":2}]