PPSC Economics Topic 13 Mathematics in Economics With Answers

PPSC Economics Topic 13 Mathematics in Economics

Sr. # Questions Answers Choice
1 AB = BA = 1 , then B is said to Ad joint of matrix of A Inverse matrix of A Determinant of A Cofactor of a
2 Ordered Pairs of two sets are called. Elements Function Cartesian product None of the above
3 The set of 'stars in the sky' is an example of Countable set Infinite set Finite set unit set
4 if A = A , then A is Symmetric matrix Skew symmetric matrix Identity matrix Orthogonal matrix
5 If matrix A is of m x n dimension, then A will be n x m dimension m x n dimension n x p dimension m x m dimension
6 The elements in the Horizontal line in a matrix is called. Columns Rows Elements Diagonal
7 If B is a subset of A ,then A is a Super set of B Sub set of B Empty set of B Universal set of B
8 Relation between two numbers or variables are called. Function Binary relation Inverse relation None of the above
9 Matrix multiplication does not satisfy Associative law Distributive law Commutative law None of the above
10 For any square matrix a of order 'n'a (Ad)A) is equal to. (Ad) A) A Determinant A Rank of A Both a and b
11 Th transpose of the cofactor matrix is called. Adjoin of the matrix Power of a matrix Minor of the matrix Rank of a matrix
12 If A and B are symmetric matrix, then AB- BA is. Symmetric Skew symmetric matrix Idempotent matrix Orthogonal matrix
13 A square matrix a such that A2 = a is called. Orthogonal matrix Skew symmetric matrix Idempotent matrix Singular matrix
14 If each element of a raw or column is a sum of two elements, the determinant can be expressed as the Sun of two determinants Difference of two determinants Multiplication of two determinants Division of two determinants
15 If each element of a raw of column of a square matrix A is zero, then the value of the determinant. is. Equal One Zero None of these
16 If every element of a raw of column of a square matrix A is zero, then the value of the determinant. is. Equal One zero Not equal
17 If every elements of a raw or column of a square matrix A is zero, then the value of the determinant . Equal Zero One Negative related
18 The determinant of a matrix and that of its transpose are Equal Zero One Negatively related
19 The signed minor of the matrass A is called. Adjoin Co factor Minor Rank
20 If A is a square matrix of order ' n' and lis the unit matrix of the same order then A 1 is equal to. A 1A 1 Both a and b
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