Square Matrix

Q. Which of the following is a lower triangular matrix

1. $\left[\begin{array}{ccc}5& 0& 0\\ 3.5& 1& 0\\ -7& 6& 3\end{array}\right]$
2. $\left[\begin{array}{ccc}-1& 0.4& 1.7\\ 0& 5& -8\\ 3& 0& -1.8\end{array}\right]$
3. $\left[\begin{array}{ccc}5& 3& 2\\ 9& 4& 11\\ 2& -23& -7\end{array}\right]$
4. $\left[\begin{array}{ccc}5& 3& 2\\ 0& -5& 2.6\\ 0& 0& 5\end{array}\right]$

Q.

What is the number of principle diagonal elements in a square matrix of order n $\times$ n.

1. n - 1

2. n

3. n + 1

4. 3

Q.

A square matrix is having p number of rows. What is ‘j’ if $a_{ij}$ is situated in the last row and second last column

1. 2

2. p + 2

3. p - 1

4. 2p

Q.

You are asked to construct a distance chart representing distances between cities given in a set with all the cities of the same set. What kind of matrix will come out of it?

1. Rectangular matrix

2. Square matrix

3. Identity matrix

4. Null matrix