Find the smallest eigen value and corresponding eigen vector of the following matrices using Power method:

1. $\left[\begin{array}{ccc} 3&2&1 \\ 2&3&2 \\ 1&2&2\end{array}\right]$
2. $\left[\begin{array}{ccc} 2&2&-1 \\ -5&9&-3 \\ -4&4&1\end{array}\right]$
3. $\left[\begin{array}{ccc} 2&-1&0 \\ -1&2&-1 \\ 0&-1&2\end{array}\right]$

Find all the eigen values and corresponding eigen vectors using Power method:

1. $\left[\begin{array}{ccc} 1&2&3 \\ 3&1&0 \\ -2&0&1\end{array}\right]$
2. $\left[\begin{array}{ccc} 4&1&0\\ 1&20&1 \\ 0&1&4\end{array}\right]$
3. $\left[\begin{array}{ccc} 2&1&1&0 \\ 1&1&0&1 \\ 1&0&0&1\\1&1&1&2\end{array}\right]$

If the largest eigen value of the matrix$\left[\begin{array}{ccc} 5&-2&0 \\ 1&2&-3 \\ 1&-2&4\end{array}\right]$is 6 and corresponding eigen vector is$\left[\begin{array}{ccc} 1 \\ -1/2 \\ 1\end{array}\right]$,then find the subdominant eigen value.

Find the eigen values of following matrix:

$\left[\begin{array}{ccc} 1&-1&0&0&0&0 \\ 1&1&-1&0&0&0 \\ 0&1&1&-1&0&0\\0&0&1&1&-1&0\\0&0&0&1&1&-1\\0&0&0&0&1&1\end{array}\right]$

Let y(x) be a continuous solution of the initial value problem

y' + 2y = f(x), y(0) = 0, where $f(x) = \begin{cases} 1, & \quad \text{if } 0 \le x\le1,\\ 0, & \quad \text{if } x>1 \end{cases}$

Then y$( \frac{3}{2})$ is equal to

(a)  $( \frac{sinh(1)}{e^3})$  (b)   $( \frac{cosh(1)}{e^3})$   (c)  $( \frac{sinh(1)}{e^2})$  (d)   $( \frac{cosh(1)}{e^2})$

The singular integral of the ODE 

$(xy'-y)^2 =x^2(x^2-y^2)$

is

(a) $y=xsinx$       (b)  $y=xsin(x+\frac{\pi}{4})$   (c)  $y=x$     (d)  $y=x+ \frac{\pi}{4}$

The initial value problem

$y'=2\sqrt{y}, y(0)=a,$

has

(a) a unique solution if a < 0,

(b) no solution if a > 0,

(c) infinitely many solutions if a = 0

(d) a unique solution if a ≥ 0

For the initial value problem

$\begin {cases} \frac{dy}{dx}=y^2+cos^2x, x>0,\\ y(0)=0 \end{cases}$

The largest interval of existence of the solution predicted by Picard’s theorem is:

(a) [0, 1] (b) [0, $\frac{1}{2}$ ] (c) [0, $\frac{1}{3}$ ] (d) [0, $\frac{1}{4}$ ]

Consider the ODE $y'=f(y(x))$. If f is an even function and y is an odd function, then

(a) $-y(-x)$is also a solution.

(b)$y(-x)$is also a solution.

(c) $-y(x)$ is also a solution.

(d) $y(x)y(-x)$ is also a solution.

Let $y:[o,\infty) \rightarrow [0,\infty)$be a continuously differentiable function satisfying 

$y(t)=y(0) +\int_0^t y(s)ds,$ for $t\ge0.$

Then

(a)   $y^2(t)=y^2(0)=\int_0^t y^2(s)ds.$

(b)   $y^2(t)=y^2(0)+2\int_0^t y^2(s)ds.$

(c)   $y^2(t)=y^2(0)+\int_0^t y(s)ds.$

(d)   $y^2(t)=y^2(0)+\left(\int_0^ty(s)ds\right)^2 +2y(0)\int_0^ty(s)ds.$

Let u(t) be a continuously differentiable function taking non-negative values for t > 0 and satisfying $u'(t)=4u^\frac{3}{4}(t);u(0)=0.$Then

(a)  u(t)=0.

(b)  $u(t)=t^4$

(c)   $u(t)=\begin{cases} 0\;\;\; for\, 0<t<1,\\ (t-1)^4 \;\;for \;t\ge1 \end{cases}$

(d)   $u(t)=\begin{cases} 0\;\;\; for\, 0<t<10,\\ (t-10)^4 \;\;for \;t\ge10 \end{cases}$