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Q.

Among the following, an identity matrix is

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a

$[\begin{matrix} 0 & 1 \\ 1 & 0 \end{matrix}]$

b

$[\begin{matrix} 1 & 0 \\ 0 & 1 \end{matrix}]$

c

$[\begin{matrix} 1 & 1 \\ 1 & 1 \end{matrix}]$

d

$[\begin{matrix} 0 & 0 \\ 1 & 1 \end{matrix}]$

answer is B.

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Detailed Solution

A Square Matrix is called a Unit Matrix, if all its non-diagonal elements are zero and all diagonal elements are units.

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