Consider the following statements :
1. Every zero matrix is a square matrix.
2. A matrix has a numerical value.
3. A unit matrix is a diagonal matrix.
Which of the above statements is/are correct ?

2 only

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3 only

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2 and 3

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1 and 3

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Solution

The correct option is B 3 only
Zero Matrix is a matrix whose every element is $0$ . The matrix may or may not be a square matrix.
A matrix does't have any numerical value, it has a determinant.
A unit matrix has $1^{'} s$ in the diagonal place and $0$ elsewhere. So it is a diagonal matrix.
Hence, only 3 is correct.

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Consider the following statements :1. Every zero matrix is a square matrix.2. A matrix has a numerical value.3. A unit matrix is a diagonal matrix.Which of the above statements is/are correct ?

Consider the following statements :
1. Every zero matrix is a square matrix.
2. A matrix has a numerical value.
3. A unit matrix is a diagonal matrix.
Which of the above statements is/are correct ?