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If A is a square matrix, then A is symme...

If A is a square matrix, then A is symmetric, iff

A

`A^(2)=A`

B

`A^(2)=l`

C

`A^(T)=A`

D

`A^(T)=-A`

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The correct Answer is:
C
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AAKASH INSTITUTE ENGLISH-MATRICES-Assignment (Section - A) Objective Type Questions (One option is correct)
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  3. If A is a square matrix, then A is symmetric, iff

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  4. If A is a square matrix, then A is skew symmetric if

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  5. If A is any square matrix, then

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  6. If A and B are symmetric matrices of the same order then (AB-BA) is al...

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  7. Let A be a square matrix. Then which of the following is not a symmetr...

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  8. Each diagonal elemetn of a skew symmetric matrix is (A) zero (B) negat...

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  9. If A={:[(1,0),(1,1)]:},"then "A^(2008) is equal to

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  11. if for a matrix A, A^2+I=O, where I is the identity matrix, then A equ...

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  12. about to only mathematics

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  13. If {:A+B=[(1,0),(1,1)]andA-2B=[(-1,1),(0,-1)]:}," then "A=

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  14. {:[(7,1,2),(9,2,1)]:}{:[(3),(4),(5)]:}+2{:[(4),(2)]:} is equal to

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  15. If f(x)=x^(2)+4x-5andA={:[(1,2),(4,-3)]:}, then f(A) is equal to

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  16. Multiplicative inverse of the matrix [[2,1],[7,4]] is (i) [[4,-1],[-7...

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  17. If the matrix A is such that ({:(1,3),(0,1):})A=({:(1,1),(0,-1):}), t...

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  18. If A is a square matrix such that A^2=I , then A^(-1) is equal to A...

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  19. If X+{:[(2,1),(6,1)]:}={:[(1,1),(0,1)]:} then 'X' is equal to

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  20. If A={:[(1,2,3),(-2,5,7)]:}and2A-3B={:[(4,5,-9),(1,2,3)]:} then B is e...

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