1
JEE Advanced 2016 Paper 1 Offline
MCQ (More than One Correct Answer)
+4
-2

Let $$P = \left[ {\matrix{ 3 & { - 1} & { - 2} \cr 2 & 0 & \alpha \cr 3 & { - 5} & 0 \cr } } \right]$$, where $$\alpha$$ $$\in$$ R. Suppose $$Q = [{q_{ij}}]$$ is a matrix such that PQ = kl, where k $$\in$$ R, k $$\ne$$ 0 and I is the identity matrix of order 3. If $${q_{23}} = - {k \over 8}$$ and $$\det (Q) = {{{k^2}} \over 2}$$, then

A
$$\alpha$$ = 0, k = 8
B
$$4\alpha - k + 8 = 0$$
C
$$\det (Padj(Q)) = {2^9}$$
D
$$\det (Qadj(P)) = {2^{13}}$$
2
JEE Advanced 2015 Paper 1 Offline
MCQ (More than One Correct Answer)
+4
-2

Let X and Y be two arbitrary, 3 $$\times$$ 3, non-zero, skew-symmetric matrices and Z be an arbitrary 3 $$\times$$ 3, non-zero, symmetric matrix. Then which of the following matrices is(are) skew symmetric?

A
Y3Z4 $$-$$ Z4Y3
B
X44 + Y44
C
X4Z3 $$-$$ Z3X4
D
X23 + Y23
3
JEE Advanced 2015 Paper 1 Offline
MCQ (More than One Correct Answer)
+4
-2

Which of the following values of $$\alpha$$ satisfy the equation

$$\left| {\matrix{ {{{(1 - \alpha )}^2}} & {{{(1 + 2\alpha )}^2}} & {{{(1 + 3\alpha )}^2}} \cr {{{(2 + \alpha )}^2}} & {{{(2 + 2\alpha )}^2}} & {{{(2 + 3\alpha )}^2}} \cr {{{(3 + \alpha )}^2}} & {{{(3 + 2\alpha )}^2}} & {{{(3 + 3\alpha )}^2}} \cr } } \right| = - 648\alpha$$ ?

A
$$-$$4
B
9
C
$$-$$9
D
4
4
JEE Advanced 2014 Paper 1 Offline
MCQ (More than One Correct Answer)
+4
-2
Let M be a 2 $$\times$$ 2 symmetric matrix with integer entries. Then, M is invertible, if
A
the first column of M is the transpose of the second row of M
B
the second row of M is the transpose of the first column of M
C
M is a diagonal matrix with non-zero entries in the main diagonal
D
the product of entries in the main diagonal of M is not the square of an integer
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