Question:

For any square matrix A of order ‘n’, A(Adj A) is equal to

A.

(adj a)a

B.

determinant a

C.

rank of a

D.

both a & b

Answer» d. both a & b

Question:

If the ith raw and jth column of a square matrix of order ‘n’ are deleted, the determinant of theresulting square sub-matrix is called

A.

adjoint

B.

co-factor

C.

minor

D.

rank

Answer» c. minor

Question:

In any equation (or function) involving two variables, such as y = 2x + 1, the variable that appearson the right-hand side of the equation is by convention called

A.

dependent variable

B.

independent variable

C.

endogenous variable

D.

explained variable

Answer» b. independent variable

Question:

If the determinant formed by the elements of the matrix is not equal to zero, then the matrix iscalled

A.

skew symmetric

B.

symmetric

C.

singular

D.

non-singular

Answer» d. non-singular

Question:

If all the elements of a matrix of any order are zero, it is called

A.

identity matrix

B.

null matrix

C.

zero matrix

D.

both b & c

Answer» d. both b & c

Question:

The equilibrium price and quantity, given the inverse demand and supply functionsbp D =-3q + 30 and pS = 2q – 5

A.

p = 9 and q = 7

B.

p = 10 and q = 7

C.

p = 9 and q = 8

D.

p = 7 and q = 9

Answer» a. p = 9 and q = 7

Question:

A square matrix A of order mxn is called an upper triangular matrix if aij = o for all

A.

i > j

B.

i < j

C.

i = j

D.

all of the above

Answer» a. i > j

Question:

Determinant of triangular matrix is the product of

A.

diagonal elements

B.

off-diagonal elements

C.

rows

D.

columns

Answer» a. diagonal elements

Question:

Rectangular array of numbers, variables or parameters is called

A.

set

B.

exponents

C.

matrix

D.

function

Answer» c. matrix

Question:

The slope of a vertical line is

A.

one

B.

zero

C.

two

D.

undefined

Answer» d. undefined