GATE EE 2008 | Linear Algebra Question 43 | Engineering Mathematics

GATE EE 2008

MCQ (Single Correct Answer)

-0.6

Let $$P$$ be $$2x2$$ real orthogonal matrix and $$\overline x $$ is a real vector $${\left[ {\matrix{ {{x_1}} & {{x_2}} \cr } } \right]^T}$$ with length $$\left| {\left| {\overline x } \right|} \right| = {\left( {{x_1}^2 + {x_2}^2} \right)^{1/2}}.$$ Then which one of the following statement is correct?

$$\left| {\left| {P\overline x } \right|} \right| \le \left| {\left| {\overline x } \right|} \right|$$ where at least one vector satisfies $$\left| {\left| {P\overline x } \right|} \right| < \left| {\left| {\overline x } \right|} \right|$$

$$\left| {\left| {P\overline x } \right|} \right| = \left| {\left| {\overline x } \right|} \right|$$ for all vectors $${\overline x }$$

$$\left| {\left| {P\overline x } \right|} \right| \ge \left| {\left| {\overline x } \right|} \right|$$ where at least one vector satisfies $$\left| {\left| {P\overline x } \right|} \right| > \left| {\left| {\overline x } \right|} \right|$$

No relationship can be established between $$\left| {\left| {\overline x } \right|} \right|$$ and $$\left| {\left| {P\overline x } \right|} \right|$$

GATE EE 2008

MCQ (Single Correct Answer)

-0.6

If the rank of a $$5x6$$ matrix $$Q$$ is $$4$$ then which one of the following statements is correct?

$$Q$$ will have four linearly independent rows and four linearly independent columns

$$Q$$ will have four linearly independent rows and five linearly independent columns

$$Q{Q^T}$$ will be invertible.

$${Q^T}Q$$ will be invertible.

GATE EE 2007

MCQ (Single Correct Answer)

-0.6

$${q_1},\,{q_2},{q_3},.......{q_m}$$ are $$n$$-dimensional vectors with $$m < n.$$ This set of vectors is linearly dependent. $$Q$$ is the matrix with $${q_1},\,{q_2},{q_3},.......{q_m}$$ as the columns. The rank of $$Q$$ is

less than $$m$$

$$m$$

between $$m$$ and $$n$$

$$n$$

GATE EE 2007

MCQ (Single Correct Answer)

-0.6

If $$A = \left[ {\matrix{ { - 3} & 2 \cr { - 1} & 0 \cr } } \right]$$ then $$A$$ satisfies the relation

$$A - 31 + 2\,{A^{ - 1}} = 0$$

$${A^2} + 2A + 2I = 0$$

$$\left( {A + I} \right)\left( {A + 2I} \right) = 0$$

$${e^A} = 0$$