Question

Which of the following is a null matrix?

• A. $\left[\begin{array}{cc}0& 1\\ 0& 0\end{array}\right]$
• B. $\left[\begin{array}{cc}0& 0\\ 0& 1\end{array}\right]$
• C. $\left[\begin{array}{cc}0& 0\\ 0& 0\end{array}\right]$
• D. $\left[\begin{array}{cc}1& 0\\ 0& 0\end{array}\right]$

Answer 1

The correct option is C

$\left[\begin{array}{cc}0& 0\\ 0& 0\end{array}\right]$

For a matrix to be called as a null matrix all its entries should be zero. In the above mentioned options only C is such a matrix where all the entries are zero.