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WB JEE

Differential Equations

Mathematics

Previous Years Questions

MCQ (Single Correct Answer)

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If the transformation $$z = \log \tan {x \over 2}$$ reduces the differential equation $${{{d^2}y} \over {d{x^2}}} + \cot...
WB JEE 2022
The solution of $$\cos y{{dy} \over {dx}} = {e^{x + \sin y}} + {x^2}{e^{\sin y}}$$ is $$f(x) + {e^{ - \sin y}} = C$$ (C ...
WB JEE 2022
The differential of $$f(x) = {\log _e}(1 + {e^{10x}}) - {\tan ^{ - 1}}({e^{5x}})$$ at x = 0 and for dx = 0.2 is
WB JEE 2021
If $$x{{dy} \over {dx}} + y = {{xf(xy)} \over {f'(xy)'}}$$, then | f(xy) | is equal to (where k is an arbitrary positive...
WB JEE 2021
The differential equation of all the ellipses centred at the origin and have axes as the co-ordinate axes is where $$y^{...
WB JEE 2021
Let $$y = {1 \over {1 + x + lnx}}$$, then
WB JEE 2020
Let $$y = f(x) = 2{x^2} - 3x + 2$$. The differential of y when x changes from 2 to 1.99 is
WB JEE 2020
The differential equation of the family of curves y = ex (A cos x + B sin x) where, A, B are arbitrary constants is...
WB JEE 2020
If $$x\sin \left( {{y \over x}} \right)dy = \left[ {y\sin \left( {{y \over x}} \right) - x} \right]dx,\,x > 0$$ and $...
WB JEE 2020
Let f be a differentiable function with $$\mathop {\lim }\limits_{x \to \infty } f(x) = 0.$$ If $$y' + yf'(x) - f(x)f'(x...
WB JEE 2020
Let cos$$^{ - 1}\left( {{y \over b}} \right) = \log {\left( {{x \over n}} \right)^n}$$. Then
WB JEE 2020
General solution of $${(x + y)^2}{{dy} \over {dx}} = {a^2},a \ne 0$$ is (C is an arbitrary constant)
WB JEE 2019
The general solution of the differential equation $$\left( {1 + {e^{{x \over y}}}} \right)dx + \left( {1 - {x \over y}} ...
WB JEE 2019
Let y(x) be a solution of $$(1 + {x^2}){{dy} \over {dx}} + 2xy - 4{x^2} = 0$$. Then y(1) is equal to
WB JEE 2018
The differential equation representing the family of curves $${y^2} = 2d(x + \sqrt d )$$, where d is a parameter, is of
WB JEE 2018
The integrating factor of the first order differential equation $${x^2}({x^2} - 1){{dy} \over {dx}} + x({x^2} + 1)y = {x...
WB JEE 2017
Solution of $${(x + y)^2}{{dy} \over {dx}} = {a^2}$$ ('a' belong a constant) is
WB JEE 2017
If $$y = {e^{m{{\sin }^{ - 1}}x}}$$ then $$(1 - {x^2}){{{d^2}y} \over {d{x^2}}} - x{{dy} \over {dx}} - $$ky = 0, where k...
WB JEE 2017
The differential equation of y = aebx (a & b are parameters) is
WB JEE 2011
Integrating factor (I.F.) of the differential equation $${{dy} \over {dx}} - {{3{x^2}} \over {1 + {x^3}}}y = {{{{\sin }^...
WB JEE 2011
The solution of $${{dy} \over {dx}} = {y \over x} + \tan {y \over x}$$ is
WB JEE 2011
he general solution of the differential equation $${\log _e}\left( {{{dy} \over {dx}}} \right) = x + y$$ is
WB JEE 2011
The degree and order of the differential equation $$y = x{\left( {{{dy} \over {dx}}} \right)^2} + {\left( {{{dx} \over {...
WB JEE 2011
The general solution of the differential equation $${{{d^2}y} \over {d{x^2}}} + 8{{dy} \over {dx}} + 16y = 0$$ is
WB JEE 2011
The displacement of a particle at time t is x, where x = t4 $$-$$ kt3. If the velocity of the particle at time t = 2 is ...
WB JEE 2010
The displacement x of a particle at time t is given by x = At2 + Bt + C, where A, B, C are constants and v is velocity o...
WB JEE 2010
If the displacement, velocity and acceleration of a particle at time t be x, v and f respectively, then which one is tru...
WB JEE 2010
Solution of the differential equation xdy $$-$$ ydx = 0 represents a
WB JEE 2010
The equation of one of the curves whose slope at any point is equal to y + 2x is
WB JEE 2010
The degree of the differential equation $$x = 1 + \left( {{{dy} \over {dx}}} \right) + {1 \over {2!}}{\left( {{{dy} \ove...
WB JEE 2010
If $$y'' - 3y' + 2y = 0$$ where y(0) = 1, y'(0) = 0, then the value of y at $$x = {\log _e}2$$ is
WB JEE 2010
The general solution of the differential equation $$100{{{d^2}y} \over {d{x^2}}} - 20{{dy} \over {dx}} + y = 0$$ is...
WB JEE 2010
The order of the differential equation $${{{d^2}y} \over {d{x^2}}} = \sqrt {1 + {{\left( {{{dy} \over {dx}}} \right)}^2}...
WB JEE 2009
If x2 + y2 = 1, then
WB JEE 2009
The integrating factor of the differential equation $$x\log x{{dy} \over {dx}} + y = 2\log x$$ is given by
WB JEE 2009
The general solution of the differential equation $${{dy} \over {dx}} = {e^{y + x}} + {e^{y - x}}$$ is where c is an arb...
WB JEE 2009
The slope at any point of a curve y = f(x) is given by $${{dy} \over {dx}} = 3{x^2}$$ and it passes through ($$-$$1, 1)....
WB JEE 2009
The differential equation of the family of curves $$y = {e^{2x}}(a\cos x + b\sin x)$$, where a and b are arbitrary const...
WB JEE 2008
The differential equation of the family of circles passing through the fixed points (a, 0) and ($$-$$a, 0) is
WB JEE 2008
The order and degree of the following differential equation $${\left[ {1 + {{\left( {{{dy} \over {dx}}} \right)}^2}} \ri...
WB JEE 2008
The solution of the differential equation $${{dy} \over {dx}} = {e^{y + x}} + {e^{y - x}}$$ is
WB JEE 2008
The differential equation of all parabolas whose axes are parallel to y-axis is
WB JEE 2008
The degree of the differential equation $${\left[ {1 + {{\left( {{{dy} \over {dx}}} \right)}^2}} \right]^{5/3}} = {{{d^2...
WB JEE 2008

Subjective

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Find the general solution of $$(x + \log y)dy + y\,dx = 0$$
WB JEE 2011
Let R be the set of real numbers and f : R $$\to$$ R be such that for all x, y $$\in$$ R, $$|f(x) - f(y)| \le |x - y{|^3...
WB JEE 2011
If $${{dy} \over {dx}} + \sqrt {{{1 - {y^2}} \over {1 - {x^2}}}} = 0$$, prove that $$x\sqrt {1 - {y^2}} + y\sqrt {1 - ...
WB JEE 2010
If f is differentiable at x = a, find the value of $$\mathop {\lim }\limits_{x \to a} {{{x^2}f(a) - {a^2}f(x)} \over {x ...
WB JEE 2009
If x = sin t, y = sin 2t, prove that $$(1 - {x^2}){{{d^2}y} \over {d{x^2}}} - x{{dy} \over {dx}} + 4y = 0$$
WB JEE 2009
Show that sin x is a monotonic increasing function of x in 0
WB JEE 2008

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