1
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.25
Change Language
The number of irrational terms in the expansion of $${\left( {{3^{{1 \over 8}}} + {5^{{1 \over 4}}}} \right)^{84}}$$ is
A
73
B
74
C
75
D
76
2
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.25
Change Language
Let A be a square matrix of order 3 whose all entries are 1 and let I3 be the identity matrix of order 3. Then, the matrix $$A - 3{I_3}$$ is
A
invertible
B
orthogonal
C
non-invertible
D
real Skew Symmetric matrix
3
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.25
Change Language
If M is any square matrix of order 3 over R and if M' be the transpose of M, then adj(M') $$-$$ (adj M)' is equal to
A
M
B
M'
C
null matrix
D
identity matrix
4
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.25
Change Language
If $$A = \left( {\matrix{ 5 & {5x} & x \cr 0 & x & {5x} \cr 0 & 0 & 5 \cr } } \right)$$ and $$|A{|^2} = 25$$, then | x | is equal to
A
$${1 \over 5}$$
B
5
C
52
D
1
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