1
WB JEE 2009
+1
-0.25

If A is a square matrix. Then

A
A + AT is symmetric
B
AAT is skew-symmetric
C
AT + A is skew-symmetric
D
ATA is skew-symmetric
2
WB JEE 2009
+1
-0.25

If A2 $$-$$ A + I = 0, then the inverse of the matrix A is

A
A $$-$$ I
B
I $$-$$ A
C
A + I
D
A
3
WB JEE 2009
+1
-0.25

If A and B are square matrices of the same order and AB = 3I, then A$$-$$1 is equal to

A
3B
B
$${1 \over 3}$$B
C
3B$$-$$1
D
$${1 \over 3}$$B$$-$$1
4
WB JEE 2010
+1
-0.25

If the matrices $$A = \left[ {\matrix{ 2 & 1 & 3 \cr 4 & 1 & 0 \cr } } \right]$$ and $$B = \left[ {\matrix{ 1 & { - 1} \cr 0 & 2 \cr 5 & 0 \cr } } \right]$$, then AB will be

A
$$\left[ {\matrix{ {17} & 0 \cr 4 & { - 2} \cr } } \right]$$
B
$$\left[ {\matrix{ 4 & 0 \cr 0 & 4 \cr } } \right]$$
C
$$\left[ {\matrix{ {17} & 4 \cr 0 & { - 2} \cr } } \right]$$
D
$$\left[ {\matrix{ 0 & 0 \cr 0 & 0 \cr } } \right]$$
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Physics
Mechanics
Electricity
Optics
Modern Physics
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Physical Chemistry
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Organic Chemistry
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