Question:

If A is a square matrix of order ‘n’ and I is the unit matrix of the same order, then AI is equal to

A.

a

B.

ia

C.

i

D.

both (a) & (b)

Answer» d. both (a) & (b)

Question:

If the determinant formed by the elements of the matrix A is equal to zero, then the matrix is

A.

skew symmetric

B.

symmetric

C.

singular

D.

non-singular

Answer» c. singular

Question:

If two sets contain the same distinct elements, then they are called

A.

equal sets

B.

unequal sets

C.

equivalent sets

D.

all the above

Answer» a. equal sets

Question:

A square matrix A such that A2 = A is called

A.

orthogonal matrix

B.

skew symmetric matrix

C.

idempotent matrix

D.

singular matrix

Answer» c. idempotent matrix

Question:

A set containing no element is called

A.

null set

B.

empty set

C.

void set

D.

all the above

Answer» d. all the above

Question:

The value of the dependent variable where the graph cuts the y-axis is called

A.

x-intercept

B.

y-intercept

C.

slope

D.

none of these

Answer» b. y-intercept

Question:

Find the co-factor A23 of the matrix A =

A.

23

B.

7

C.

-23

D.

-7

Answer» d. -7

Question:

Determinant of a 3X3 square matrix is called —– determinant

A.

first order

B.

second order

C.

third order

D.

fourth order

Answer» c. third order

Question:

“Null set is a proper subset of all the non-null sets”. This statement is

A.

always true

B.

sometimes true

C.

never true

D.

true subject to some conditions

Answer» a. always true

Question:

Union of A with A, that is, A U A =

A.

complement of a

B.

a itself

C.

cannot be determined

D.

none of these

Answer» b. a itself