Quiznetik
Mathematics for Economic Analysis 1 | Set 2
1. If the number of elements of the two sets are equal, then they are called
A. equal set
B. equivalent set
C. order set
D. subset
Correct : B. equivalent set
2. If a set has three elements, then its power set consist of ----- elements
A. 3
B. 5
C. 6
D. 8
Correct : D. 8
3. Given A in 2x2 and B is 2x4, then the matrix AB will be of the order
A. 2x2
B. 2x4
C. 4x2
D. 1x2
Correct : B. 2x4
4. Maximum number of linearly independent rows and columns of a matrix is called
A. rank
B. adjoint
C. determinant
D. inverse
Correct : A. rank
5. Determinant of a 3X3 square matrix is called ----- determinant
A. first order
B. second order
C. third order
D. fourth order
Correct : C. third order
6. The set consisting of all the elements which belong to A as well as B is called
A. union
B. intersection
C. complement
D. partition
Correct : B. intersection
7. The total number of elements of the set of all possible outcome when two coins are tossed
A. 2
B. 3
C. 4
D. 6
Correct : C. 4
8. Special type of relation is
A. function
B. binary relation
C. inverse
D. none of the above
Correct : A. function
9. Rectangular array of numbers, variables or parameters is called
A. set
B. exponents
C. matrix
D. function
Correct : C. matrix
10. When the demand for a good is given by Q=50-P, the maximum amount that would be demanded at nil price
A. 1
B. 0
C. 40
D. 50
Correct : D. 50
11. Given A={a,b,c} and B={a,d,c}, then AUB will be
A. a,b,c
B. a,d,c
C. c,d,a
D. a,b,c,d
Correct : D. a,b,c,d
12. in a square matrix, the elements lie from left top to right bottom is
A. diagonal elements
B. row elements
C. column elements
D. triangular elements
Correct : A. diagonal elements
13. if all the elements below the leading diagonal are zero in a square matrix, it is
A. lower triangular matrix
B. identity matrix
C. inverse matrix
D. upper triangular matrix
Correct : B. identity matrix
14. conformity condition for matrix addition is that matrices should be
A. square
B. same order
C. equal
D. proportional
Correct : B. same order
15. commutative law of matrix subtraction is
A. a+b=b+a
B. a-b=b-a
C. a-b= -b+a
D. a+b=a-b
Correct : C. a-b= -b+a
16. In matrix algebra (AB)C=A(BC) is
A. associative
B. commutative
C. distributive
D. none of the above
Correct : A. associative
17. In matrix expression of linear equation, AX=B, X denotes
A. coefficient matrix
B. constants
C. identity matrix
D. solution vector
Correct : D. solution vector
18. If in a matrix any two rows or columns are identical or proportional or linearly dependent, the determinant will be
A. equal
B. zero
C. unity
D. infinity
Correct : B. zero
19. Given the demand curve, P=20-0.2Q, the revenue curve will be
A. 20-0.2q
B. 10-.1q
C. 20q-0.2q
D. 20q-0.2q2
Correct : D. 20q-0.2q2
20. The slope of isocost line is the ratio of
A. quantities
B. input prices
C. costs
D. product prices
Correct : B. input prices
21. The line of linear equation should begin from
A. the origin
B. x axis
C. y axis
D. any of the above
Correct : D. any of the above
22. For a matrix minor of element M33 =25, the cofactor is
A. -25
B. 25
C. 0
D. 33
Correct : B. 25