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Question

# _____ matrix is a square matrix in which all the elements other than the principal diagonal elements are zero.

A
scalar
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B
null
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C
diagonal
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D
unit
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Solution

## The correct option is C diagonalA diagonal matrix is a square matrix in which all the elements other than the principal diagonal elements are zero.Unit matrix and scalar matrix are special case of a diagonal matrix.A diagonal matrix, in which all diagonal elements are equal to same scalar, is called a scalar matrix.A diagonal matrix, in which all diagonal elements are equal to one, is called a unit matrix.Example: Diagonal matrix in 2×2 form.[1003]So, only Option C is the correct answer.As unit matrix and every scalar matrix is a diagonal matrix, but every diagonal matrix need not to be unit matrix and scalar matrix.

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