A square matrix [a_{i j}] such that a_{i j}=0 for i \neq j and a_{i j}=k where k is a constant for i=j is called :

Correct Answer is : scalar matrix

diagonal matrix, but not scalar matrix

UPSC NDA 2 2012 Mathematics Paper

Question : 28 of 120

Marks: +1, -0

A square matrix [aij] such that aij=0 for i≠j and aij=k where k is a constant for i=j is called :

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0	‌ for ‌	i≠j
k	‌ for ‌	i=j