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A square matrix A=[a(ij)] in which a(ij)...

A square matrix `A=[a_(ij)]` in which `a_(ij)=0` for `i!=j` and `[a]_(ij)=k` (constant) for `i=j` is called a

A

unit matrix

B

null matrix

C

scalar matrix

D

diagonal matrix

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The correct Answer is:
C
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NIKITA PUBLICATION-MATRICES-MULTIPLE CHOICE QUESTIONS
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  3. Choose the correct answer

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  4. Square matrix [a(ij)](ntimesm) will be an upper triangular matrix, if

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  5. In a upper triangular matrix ntimesn, minimum number of zeros is

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  6. In a skew-symmetrix matrix, the diagonal elements are all

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  7. If A is a square matrix for which a(ij)=i^(2)-j^(2), then matrix A is

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  8. Which of the following is not true?

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  9. Which one of the following is correct?

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  10. If A is square matrix, A+A^(T) is symmetric matrix, then A-A^(T)=

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  11. If A^(T) is a skew-symmetric matrix and n is a positive integer, then ...

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  12. If I is unit matrix of order n, then 3I will be

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  13. If A is a square matrix of order n then |kA|=

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  14. If A and B are square matrices of same order, then

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  15. If two matrices A and B are of order ptimesq and r timess respectively...

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  16. Matrix A is of order mtimesn, matrix B is of order ptimesq such that A...

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  17. If A and B are two matrices such that A+B and AB are both defined, the...

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  18. If A is a mtimesn matrix and B is a matrix such that both AB and BA ar...

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  19. Which one of the following is not true?

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  20. Which is true about matrix multiplication?

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