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51
If \[{\text{A}} = \left[ {\begin{array}{*{20}{c}} {2 + {\text{i}}}&3&{ - 1 + 3{\text{i}}} \\ { - 5}&{\text{i}}&{4 - 2{\text{i}}} \end{array}} \right],\]     then AA∗ will be
(where, A∗ is the conjugate transpose of A)
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Answer: Option C
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52
Consider the following system of linear equations:
3x + 2ky = -2
kx + 6y = 2
Here, x and y are the unknown and k is a real constant. The value of k for which there are infinite number of solutions is
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Answer: Option C
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53
Consider the matrix as given below:
\[\left[ {\begin{array}{*{20}{c}} 1&2&3 \\ 0&4&7 \\ 0&0&3 \end{array}} \right]\]
Which one of the following options provides the CORRECT values of the eigen values of the matrix?
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Answer: Option A
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54
The two Eigen values of the matrix \[\left[ {\begin{array}{*{20}{c}} 2&1 \\ 1&{\text{p}} \end{array}} \right]\]  have a ratio of 3 : 1 for p = 2. What is another value of p for which the Eigen values have the same ratio of 3 : 1?
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Answer: Option D
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55
The following simultaneous equations
x + y + z = 3
x + 2y + 3z = 4
x + 4y + kz = 6
will NOT have a unique solution for k equal to
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Answer: Option D
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56
[A] is square matrix which is neither symmetric nor skew-symmetric and [A]T is its transpose. The sum and difference of these matrices are defined as [S] = [A] + [A]T and [D] = [A] - [A]T, respectively. Which of the following statements is TRUE?
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Answer: Option D
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57
The Eigen values of the matrix \[\left[ {\text{P}} \right] = \left[ {\begin{array}{*{20}{c}} 4&5 \\ 2&{ - 5} \end{array}} \right]\]   are
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Answer: Option B
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58
If A is square symmetrical real valued matrix of dimensions 2n, then eigen values of A are
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Answer: Option B
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59
The eigen values of the matrix given below are
\[\left[ {\begin{array}{*{20}{c}} 0&1&0 \\ 0&0&1 \\ 0&{ - 3}&{ - 4} \end{array}} \right]\]
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Answer: Option A
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60
\[{\text{P}} = {\left[ {\begin{array}{*{20}{c}} { - 10} \\ { - 1} \\ 3 \end{array}} \right]^{\text{T}}},{\text{Q}} = {\left[ {\begin{array}{*{20}{c}} { - 2} \\ { - 5} \\ 9 \end{array}} \right]^{\text{T}}}\]     and \[{\text{R}} = {\left[ {\begin{array}{*{20}{c}} 2 \\ { - 7} \\ {12} \end{array}} \right]^{\text{T}}}\]  are three vectors. An orthogonal set of vectors having a span that contains P, Q, R is
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Answer: Option A
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