Mathematical Tools For Economics 1 Set 1

Bachelor of Arts in Economics (BA Economics)

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This set of Mathematical Tools for Economics 1 Multiple Choice Questions & Answers (MCQs) focuses on Mathematical Tools For Economics 1 Set 1

Q1 | Suppose there is a Set S, which is the largest possible subset of S
  • s1
  • s
  • ∅
  • none of these
Answer: s
Q2 | Suppose there is a set S, which is the smallest possible subset of S
  • s1
  • s
  • ∅
  • none of these
Answer: ∅
Q3 | If a set S1 has n elements and S2 has m elements, how many ordered pairs can form in general?
  • m x n
  • m + n
  • m/n
  • none of these:
Answer: m x n
Q4 | 224.……………. is known as a signed minor
  • rank
  • cofactor
  • inverse
  • none
Answer: inverse
Q5 | A set which contains only one element is called
  • singleton set
  • finite set
  • proper set
  • none of these
Answer: singleton set
Q6 | If all the sets under consideration are subsets of a fixed set say ∪, then this set ∪ is called
  • universal set
  • power set
  • disjoint set
  • finite set
Answer: universal set
Q7 | Two sets A and B are said to be …………………. sets if no element of A is in B and noelement of B is in A.
  • universal
  • disjoint
  • equivalent
  • none of these
Answer: disjoint
Q8 | A matrix with equal number of rows and columns is called:
  • row matrix
  • column matrix
  • square matrix
  • none
Answer: square matrix
Q9 | A square matrix in which all elements except those in diagonal are zero are called:
  • diagonal matrix
  • identity matrix
  • null matrix
  • none
Answer: diagonal matrix
Q10 | A diagonal matrix with all its diagonal elements equal to 1 is known as:
  • triangular matrix
  • zero matrix
  • identity matrix
  • none
Answer: identity matrix
Q11 | A matrix in which every element is zero is called
  • scalar matrix
  • null matrix
  • square matrix
  • inverse matrix
Answer: null matrix
Q12 | Matrix obtained by inter changing the rows and columns is called ………… of a matrix
  • inverse
  • transpose
  • negative
  • none
Answer: transpose
Q13 | The matrix A is idempotent if:
  • a2 = a
  • a = at
  • a2 = at
  • none
Answer: a2 = a
Q14 | If A and B are square matrices such that AB = BA, then A and B are called…………..
  • additive
  • multiplicative
  • divisive
  • commutative
Answer: commutative
Q15 | If =1 23 −4 =0 −67 8, then A+B is equal to
  • 1 −410 4
  • 7 9 −3 −4
  • 3 −36 7
  • none
Answer: 1 −410 4
Q16 | If = [1 0 6] = [5 4 3], A+B is:
  • [19]
  • [6 0 9]
  • [6 4 9]
  • none
Answer: [6 4 9]
Q17 | If A is a 3 × 2 matrix, B is a 2 × 3 matrix, C is a 2 × 2 matrix and D is a 3 × 3 matrix, thenwhich of the following products does not exist?
  • ab
  • ac
  • bd
  • cd
Answer: cd
Q18 | The determinant of matrix =4 63 8 is:
  • 14
  • 7
  • -1
  • 3
Answer: 14
Q19 | If all the elements of any row or column are zero, the determinant is zero.
  • unity
  • positive
  • negative
  • zero
Answer: zero
Q20 | The determinant that results when the row and column in which that element lies are deletedis called:
  • cofactor
  • minor
  • inverse
  • none
Answer: minor
Q21 | An adjoint matrix is the ……………… of the cofactor matrix.
  • inverse
  • minor
  • cofactor
  • transpose
Answer: minor
Q22 | Inverse of A is denoted as
  • a−1
  • at
  • at
  • ai
Answer: a−1
Q23 | If the rows and columns of a determinant are interchanged, its value will:
  • change
  • change sign
  • not change
  • become zero
Answer: not change
Q24 | If a set consists of a specific number of different elements, it is called
  • infinite set
  • finite set
  • unit set
  • null set
Answer: finite set
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