Grade 12 - Mathematics - Matrices and Determinants - Quiz

An m ⨯ n matrix whose each element is zero is called a

• Row matrix

• Column matrix

• Scalar matrix

• Null matrix

A diagonal matrix in which all diagonal elements are equal is called a __________ matrix.

A matrix having only one column is called a _________ matrix.

A scalar matrix in which each diagonal element is unity is called a/an _________ matrix.

(AB)' =

• AB'

• A'B'

• B'A'

• None of these

If A' = - A, then the matrix A is called ___________

• Square matrix

• Skew-symmetric matrix

• Symmetric matrix

• Transpose of a matrix

Using determinants, find the area of the triangle with vertices (-3,5), (3,-6) and (7,2).

• 23 sq.units

• 92 sq.units

• 46 sq.units

• 64 sq.units

Find the value(s) of k if the area of the triangle with vertices (-2,0), (0,4) and (0,k) is 4 square units.

• 0

• 4,0

• 8,0

• 8