PPSC Economics Topic 13 Mathematics in Economics With Answers

PPSC Economics Topic 13 Mathematics in Economics

Sr. # Questions Answers Choice
1 If matrix A is matrix of order n x m and B is another matrix of order m x n, then BA will be the matrix of order. n x m m x n n x n m x m
2 For any square matrix A of order 'n' a +A is. Skew symmetric Non skew symmetric Symmetric Non symmetric
3 If A and B are symmetric matrices, then A +B is Symmetric Non symmetric Skew symmetric Non skew symmetric
4 A diagonal matrix whose diagonal elements are equal is called. Unit matrix Singular matrix Scalar matrix Non singular matrix
5 A square matrix a of order 'n' is called a diagonal matrix if its non diagonal elements are. zero Non zero One None of the above
6 A matrix with all elements zero other than all the diagonals is called. Diagonal matrix Orthogonal matrix Unit matrix Column vector
7 Which method is used for finding inverse of a matrix. Gauss elimination method Henrich standard method Co factor method Both a and c
8 The sufficient condition required for the matrix to posses inverse is that the matrix should be. square matrix Singular matrix Non singular matrix Orthogonal matrix
9 A inverse is defined only if A is a Square matrix Column vector Orthogonal matrix Skew symmetric matrix
10 The matrix A multiplies by its inverse will b e a. Identity matrix Skew symmetric matrix Idempotent matrix Adjoin of a matrix
11 If the determinant formed by the elements of the matrix is not equal to zero, then the matrix is called. Skew symmetric Symmetric Singular Non -singular
12 If the determinant formed by the elements of the matrix A is equal to zero, then the matrix is. Skew symmetric Singular Symmetric Non singular
13 A square matrix A, such that A = A ' is called a Symmetric matrix Skew symmetric matrix Singular matrix Rank of a matrix
14 If the columns of a given matrix A and B are changed into rows and vice versa, the matrix thus obtained is called the. Symmetric matrix Transpose of a matrix Singular matrix Rank of matrix
15 A square matrix with 1's in its principal diagonal and zeros every where else is. Diagonal matrix Identity matrix Leading diagonal Scalar matrix
16 If all the elements of a matrix of any order are zero, it is called. Identity matrix Null matrix Zero matrix Both b and c
17 In a matrix , if there is only one row but any number of columns, it is called. Row matrix Column matrix Raw vector Both a and c
18 if in a matrix , the number if rows is the same as the number of columns, it is called. Singular matrix Non singular matrix Square matrix Column vector
19 (A+B) = (B+A) this law of matrices is known as. Cumulative law Associative law Distributive law Identity law
20 (A+B) + C =a +(B+C) This law of matrices is known as. Cumulative law Associative law Distributive law Identity law
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