1
GATE PI 2012
MCQ (Single Correct Answer)
+2
-0.6
Consider the differential equation $$\,\,{x^2}{{{d^2}y} \over {d{x^2}}} + x{{dy} \over {dx}} - 4y = 0\,\,\,$$ with the boundary conditions of $$\,\,y\left( 0 \right) = 0\,\,\,$$ and $$\,\,y\left( 1 \right) = 1.\,\,\,$$ The complete solution of the differential equation is
A
$${x^2}$$
B
$$\sin \left( {{{\pi x} \over 2}} \right)$$
C
$${e^x}\sin \left( {{{\pi x} \over 2}} \right)$$
D
$${e^{ - x}}\sin \left( {{{\pi x} \over 2}} \right)$$
2
GATE PI 2011
MCQ (Single Correct Answer)
+2
-0.6
The solution of the differential equation $$\,\,\,{{{d^2}y} \over {d{x^2}}} + 6{{dy} \over {dx}} + 9y = 9x + 6\,\,\,\,$$ with $${C_1}$$ and $${C_2}$$ as constants is
A
$$y = \left( {{C_1}x + {C_2}} \right){e^{ - 3x}}$$
B
$$y = {C_1}\,{e^{3x}} + {C_2}\,{e^{ - 3x}}$$
C
$$y = \left( {{C_1}x + {C_2}} \right){e^{ - 3x}} + x$$
D
$$y = \left( {{C_1}x + {C_2}} \right){e^{3x}} + x$$
3
GATE PI 2010
MCQ (Single Correct Answer)
+2
-0.6
The solution of the differential equation $${{dy} \over {dx}} - {y^2} = 1$$ satisfying the condition $$y(0)=1$$ is
A
$$y = {e^{{x^2}}}$$
B
$$y = \sqrt x $$
C
$$\,y = \cot \left( {x + {\raise0.5ex\hbox{$\scriptstyle \pi $} \kern-0.1em/\kern-0.15em \lower0.25ex\hbox{$\scriptstyle 4$}}} \right)$$
D
$$y = tan\left( {x + {\raise0.5ex\hbox{$\scriptstyle \pi $} \kern-0.1em/\kern-0.15em \lower0.25ex\hbox{$\scriptstyle 4$}}} \right)$$
4
GATE PI 2010
MCQ (Single Correct Answer)
+2
-0.6
Which one of the following differential equations has a solution given by the function $$y = 5\sin \left( {3x + {\pi \over 3}} \right)$$
A
$${{dy} \over {dx}} - {5 \over 3}\cos \left( {3x} \right) = 0$$
B
$${{dy} \over {dx}} + {5 \over 3}\left( {\cos 3x} \right) = 0$$
C
$${{{d^2}y} \over {{d^2}\,x}} + 9y = 0$$
D
$${{{d^2}y} \over {d{x^2}}} - 9y = 0$$
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