Quiznetik
Mathematics for Economic Analysis | Set 2
1. AA-1= ----- = A-1A
A. i
B. a
C. a2
D. 0
Correct : A. i
2. 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
3. If a set has three elements, then its power set consist of ----- elements
A. 3
B. 5
C. 6
D. 8
Correct : D. 8
4. The set of all elements which belong to set B but do not belong to set A is
A. aub
B. a-b
C. b-a
D. acb
Correct : C. b-a
5. 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
6. If the matrix CxC =C, the matrix C is
A. square matrix
B. triangular matrix
C. idempotent matrix
D. identity matrix
Correct : D. identity matrix
7. Maximum number of linearly independent rows and columns of a matrix is called
A. rank
B. adjoint
C. determinant
D. inverse
Correct : A. rank
8. 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
9. 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
10. 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
11. If the relation is defined as from A to B, then relation from B to A
A. relation
B. inverse relation
C. function
D. binary
Correct : B. inverse relation
12. Special type of relation is
A. function
B. binary relation
C. inverse
D. none of the above
Correct : A. function
13. Rectangular array of numbers, variables or parameters is called
A. set
B. exponents
C. matrix
D. function
Correct : C. matrix
14. When A = {0}, the set A is
A. null
B. equal
C. singleton
D. all of the above
Correct : C. singleton
15. 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
16. 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
17. 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
18. conformity condition for matrix addition is that matrices should be
A. square
B. same order
C. equal
D. proportional
Correct : B. same order
19. 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
20. In matrix algebra (AB)C=A(BC) is
A. associative
B. commutative
C. distributive
D. none of the above
Correct : A. associative
21. 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
22. 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
23. If the demand curve is linear and negatively sloped, the marginal revenue curve has a slope
A. negative
B. positive
C. infinite
D. none of the above
Correct : A. negative
24. The slope of isocost line is the ratio of
A. quantities
B. input prices
C. costs
D. product prices
Correct : B. input prices
25. 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
26. For a matrix minor of element M33 =25, the cofactor is
A. -25
B. 25
C. 0
D. 33
Correct : B. 25