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PPSC Economics Chapter 13 Mathematics in Economics MCQs With Answers
Question # 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.
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n x m
m x n
n x n
m x m
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Question # 2
A positive definite Hessian fulfills the second order conditions for
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Maximum
Minimum
Both maximum and minimum
Mini max
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Question # 3
A variable which is free to take any value we choose to assign to it is called.
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Dependent variable
Independent variable
Endogenous variable
Explained variable
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Question # 4
A square matrix A, such that A = A ' is called a
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Symmetric matrix
Skew symmetric matrix
Singular matrix
Rank of a matrix
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Question # 5
If every element of a raw of column of a square matrix A is zero, then the value of the determinant. is.
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Equal
One
zero
Not equal
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Question # 6
a x2 + bx + c = 0
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Linear equation
Quadratic equation
Polynomial of degree five
None of these
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Question # 7
(A+B) + C =a +(B+C) This law of matrices is known as.
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Cumulative law
Associative law
Distributive law
Identity law
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Question # 8
A set continuing no elements is called.
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Null set
mpty set
void set
all of the above
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Question # 9
The value of the dependent variable where the graph cuts the y-axis is called.
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X - intercept
Y- intercept
Slope
None of these
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Question # 10
The elements in the Horizontal line in a matrix is called.
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Columns
Rows
Elements
Diagonal
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Question # 11
"Null set is proper subset of all the non nul sets" this statement is.
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Always true
sometimes true
Never true
True subject to some conditions
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Question # 12
For any square matrix a of order 'n'a (Ad)A) is equal to.
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(Ad) A) A
Determinant A
Rank of A
Both a and b
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Question # 13
If each element of a raw of column of a square matrix A is zero, then the value of the determinant. is.
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Equal
One
Zero
None of these
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Question # 14
A inverse is defined only if A is a
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Square matrix
Column vector
Orthogonal matrix
Skew symmetric matrix
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Question # 15
The objects constituting a set are called
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Estimates
Elements
Set object
Noe of these
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Question # 16
The equilibrium price and quantity , given the inverse demand and supply functions.
po = 3q +30 and p s = 2q -5
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p = 9 and q = 7
p = 10 and q = 7
p = 9 and q = 8
p = 7 and q = 9
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Question # 17
A polynomial equation with degree two a called.
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Linear equation
Quadratic equation
Parabola equation
All of the above
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Question # 18
A set totality of elements from all possible sets is called.
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Union set
Intersection set
Universal set
Unit set
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Question # 19
If every element of a set B is also an elements of A then
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A is a subset of B
B is a subset of A
A is not a subset of B
B is not a subset of A
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Question # 20
The determinant of quadratic form is called.
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Jacobian determinant
Hessian determinant
Discriminant
None of these
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Question # 21
If the determinant formed by the elements of the matrix A is equal to zero, then the matrix is.
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Skew symmetric
Singular
Symmetric
Non singular
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