# Mathematical Tools for Economics 1 Solved MCQs

1.

A. s1
B. s
C.
D. none of these
2.

A. s1
B. s
C.
D. none of these
3.

A. 2n
B. 2n
C. 2/n
D. none of these
4.

## If a set S1 has n elements and S2 has m elements, how many ordered pairs can form in general?

A. m x n
B. m + n
C. m/n
D. none of these:
5.

A. rank
B. cofactor
C. inverse
D. none
6.

A. singleton set
B. finite set
C. proper set
D. none of these
7.

A. universal set
B. power set
C. disjoint set
D. finite set
8.

A. universal
B. disjoint
C. equivalent
D. none of these
9.

A. row matrix
B. column matrix
C. square matrix
D. none
10.

## A square matrix in which all elements except those in diagonal are zero are called:

A. diagonal matrix
B. identity matrix
C. null matrix
D. none
11.

## A diagonal matrix with all its diagonal elements equal to 1 is known as:

A. triangular matrix
B. zero matrix
C. identity matrix
D. none
12.

## A matrix in which every element is zero is called

A. scalar matrix
B. null matrix
C. square matrix
D. inverse matrix
13.

A. inverse
B. transpose
C. negative
D. none
14.

A. a2 = a
B. a = at
C. a2 = at
D. none
15.

## If A and B are square matrices such that AB = BA, then A and B are called…………..

B. multiplicative
C. divisive
D. commutative
16.

A. 1 −410 4
B. 7 9 −3 −4
C. 3 −36 7
D. none
17.

A. 
B. [6 0 9]
C. [6 4 9]
D. none
18.

A. ab
B. ac
C. bd
D. cd
19.

A. 14
B. 7
C. -1
D. 3
20.

A. unity
B. positive
C. negative
D. zero
21.

A. cofactor
B. minor
C. inverse
D. none
22.

A. inverse
B. minor
C. cofactor
D. transpose
23.

A. a−1
B. at
C. at
D. ai
24.

A. change
B. change sign
C. not change
D. become zero
25.

A. infinite set
B. finite set
C. unit set
D. null set