Question types

Differential Equations question types

402 questions across 9 question groups — pick any mix to generate a Maths paper with step-by-step answer keys.

402
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9
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Sample Questions

Differential Equations questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

The number of arbitrary constants in the particular solution of a differential equation of second order is $($are$):$
  • $0$
  • B
    $1$
  • C
    $2$
  • D
    $3$

Answer: A.

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The solution of the differential equation $dy = (1 + y^2) dx$ is :
  • A
    $\text{y}=\tan\text{x}+\text{c}$
  • $\text{y}=\tan(\text{x}+\text{c})$
  • C
    $\tan^{-1}(\text{y}+\text{c})=\text{x}$
  • D
    $(\tan^{-1}(\text{y}+\text{c})=2\text{x}$

Answer: B.

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The degree and the order of the differential equation $\text{y}=\text{x}\Big(\frac{\text{dy}}{\text{dx}}\Big)^2+\Big(\frac{\text{dx}}{\text{dy}}\Big)^2$ are respectively:
  • A
    $1, 1$
  • B
    $2, 1$
  • $4, 1$
  • D
    $1, 4$

Answer: C.

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The solution of the differential equation $\text{x}\frac{\text{dy}}{\text{dx}}=\text{y}+\text{x}\ \tan\frac{\text{y}}{\text{x}}$ is :
  • $\sin\frac{\text{x}}{\text{y}}=\text{x}+\text{C}$
  • B
    $\sin\frac{\text{y}}{\text{x}}=\text{Cx}$
  • C
    $\sin\frac{\text{x}}{\text{y}}=\text{Cy}$
  • D
    $\sin\frac{\text{y}}{\text{x}}=\text{Cy}$

Answer: A.

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The degree of the differntial equation $\Big(\frac{\text{d}^{2}\text{y}}{\text{dx}^{2}}\Big)^{2}=\Big(\frac{\text{dy}}{\text{dx}}\Big)=\text{y}^{3}$ is:
  • A
    $\frac{1}{2}$
  • $2$
  • C
    $3$
  • D
    $4$

Answer: B.

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Directions: In these questions, a statement of Assertion is followed by a statement of Reason is given.Choose the correct answer out of the following choices:
Assertion: If $\frac{\text{dy}}{\text{dy}}+\text{xy}=\text{x}^3\text{y}^3,\text{x}>0,\text{y}\geq0$ and $\text{y}(0)=1,$ then $\text{y}(1)=\frac{1}{\sqrt{2}}$
Reason: The differential equation is linear with integrating factor $e^x$
  • A
    Assertion and Reason both are correct statements and Reason is the correct explanation of Assertion.
  • B
    Assertion and Reason both are correct statements but Reason is not the correct explanation of Assertion.
  • Assertion is correct statement but Reason is wrong statement.
  • D
    Assertion is wrong statement but Reason is correct statement.

Answer: C.

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Directions: In these questions, a statement of Assertion is followed by a statement of Reason is given.Choose the correct answer out of the following choices:
Assertion: The elimination of four arbitrary constants in $\text{y}=(\text{c}_1+\text{c}_2+\text{c}_3\text{e}^\text{c}4)\text{x}$ results into a differential equation of the first order $\text{x}\frac{\text{dy}}{\text{dx}}=\text{y}$
Reason: Elimination of $n$ arbitrary constants requires in general, a differential equation of the $n^{th}$ order.
  • Assertion and Reason both are correct statements and Reason is the correct explanation of Assertion.
  • B
    Assertion and Reason both are correct statements but Reason is not the correct explanation of Assertion.
  • C
    Assertion is correct statement but Reason is wrong statement.
  • D
    Assertion is wrong statement but Reason is correct statement.

Answer: A.

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Directions : In these questions, a statement of Assertion is followed by a statement of Reason is given.Choose the correct answer out of the following choices :
Assertion : Order of the differential equation whose solution is $\text{y}=\text{c}_1\text{e}^{\text{x}+\text{c}_2}+\text{c}_3\text{e}^{\text{x}+\text{c}_4}$ is $4.$
Reason : Order of the differential equation is equal to the number of independent arbitrary constants mentioned in the solution of the differential equation.
  • A
    Assertion and Reason both are correct statements and Reason is the correct explanation of Assertion.
  • B
    Assertion and Reason both are correct statements but Reason is not the correct explanation of Assertion.
  • C
    Assertion is correct statement but Reason is wrong statement.
  • Assertion is wrong statement but Reason is correct statement.

Answer: D.

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Directions : In these questions, a statement of Assertion is followed by a statement of Reason is given. Choose the correct answer out of the following choices :
Assertion : $\text{x}\sin\text{x}\frac{\text{dy}}{\text{dx}}+(\text{x}+\text{x}\cos\text{x}+\sin \text{x}) \text{y}=\sin\text{xy},$
$(\frac{\pi}{2}) =1-\frac{2}{\pi}\Rightarrow \lim\limits_{\text{x}\rightarrow0}\text{y(x)}=\frac{1}{3}.$
Reason : The differential equation is linear with integrating factor $\text{x}(1-\cos\text{x})$
  • Assertion and Reason both are correct statements and Reason is the correct explanation of Assertion.
  • B
    Assertion and Reason both are correct statements but Reason is not the correct explanation of Assertion.
  • C
    Assertion is correct statement but Reason is wrong statement.
  • D
    Assertion is wrong statement but Reason is correct statement.

Answer: A.

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Directions: In these questions, a statement of Assertion is followed by a statement of Reason is given.Choose the correct answer out of the following choices:
Assertion: The differential equation of all circles in a plane must be of order $3.$
Reason: If three points are non$-$collinear, then only one circle passes through these points.
  • A
    Assertion and Reason both are correct statements and Reason is the correct explanation of Assertion.
  • Assertion and Reason both are correct statements but Reason is not the correct explanation of Assertion.
  • C
    Assertion is correct statement but Reason is wrong statement.
  • D
    Assertion is wrong statement but Reason is correct statement.

Answer: B.

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Find the order and degree (if defined) of the differential equation $\left(\frac{d y}{d x}\right)^{3}-4\left(\frac{d y}{d x}\right)^{2}+7 y=\sin x$
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Find the equation of the curve passing through the point $\left( {0,\frac{\pi }{4}} \right)$whose differential equation is $\sin x\cos ydx + \cos x\sin ydy = 0$
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Verify that the function $x^{2}=2 y^{2} \log y$ (implicit or explicit) is a solution of the differential equation $\left(x^{2}+y^{2}\right) \frac{d y}{d x}-x y=0$
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Q 253 Marks Question3 Marks
Find the particular solution of the differential equation $\frac { d y } { d x } - 3 y \cot x = \sin 2 x$ , given that y = 2 when $x = \frac { \pi } { 2 }$.
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Find a particular solution of the differential equation $ \frac { d y } { d x } + y \cot x = 4 x \; cosec \; x$, x $\neq$ 0 given that y = 0, when $ x = \frac { \pi } { 2 }$.
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Solve the differential equation $\left( {\frac{{{e^{ - 2\sqrt x }}}}{{\sqrt x }} - \frac{y}{{\sqrt x }}} \right)\frac{{dx}}{{dy}}$ = 1 (x $\neq$ 0)
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A differential equation is said to be in the variable separable form if it is expressible in the form $f(x)\ dx = g(y)\ dy.$
The solution of this equation is given by
$\int\text{f(x)dx}=\int\text{g(y)dy}+\text{c},$ where c is the constant of integration.
Based on the above information, answer the following questions.
  1. If the solution of the differential equation $\frac{\text{dy}}{\text{dx}}=\frac{\text{ax+3}}{\text{2y+f}}$ represents a circle, then the value of 'a' is:
  1. $2$
  2. $-2$
  3. $3$
  4. $-4$
  1. The differential equation $\frac{\text{dy}}{\text{dx}}=\frac{\sqrt{1-\text{y}^2}}{\text{y}}$ determines a family of circle with.
  1. Variable radii and fixed centre $(0, 1)$
  2. Variable radii and fixed centre $(0, -1)$
  3. Fixed radius 1 and variable centre on $x-$axis
  4. Fixed radius 1 and variable centre on $y-$axis
  1. If $= y'+ 1, y(0) = 1$, then $y ($In $2) =$
  1. $1$
  2. $2$
  3. $3$
  4. $4$
  1. The solution of the differential equation $\frac{\text{dy}}{\text{dx}}=\text{e}^\text{x-y}+\text{x}^2\text{e}^\text{-y}$ is:
  1. $\text{e}^\text{x}=\frac{\text{y}^3}{3}+\text{e}^\text{y}+\text{c}$
  2. $\text{e}^\text{y}=\frac{\text{x}^2}{3}+\text{e}^\text{x}+\text{c}$
  3. $\text{e}^\text{y}=\frac{\text{x}^3}{3}+\text{e}^\text{x}+\text{c}$
  4. None of these
  1. If $\frac{\text{dy}}{\text{dx}}=\text{y}\sin2\text{x},\ \text{y}(0)=1,$ then its solution is:
  1. $\text{y}=\text{e}^{\sin^2}\text{x}$
  2. $\text{y}={\sin^2}\text{x}$
  3. $\text{y}={\cos^2}\text{x}$
  4. $\text{y}=\text{e}^{\cos^2}\text{x}$
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It is known that, if the interest is compounded continuously, the principal changes at the rate equal to the product of the rate of bank interest per annum and the principal. Let $P$ denotes the principal at any time t and rate of interest be r% per annum.

Based on the above information, answer the following question.
  1. Find the value of $\frac{\text{dP}}{\text{dt}}.$
  1. $\frac{\text{Pr}}{1000}$
  2. $\frac{\text{Pr}}{100}$
  3. $\frac{\text{Pr}}{10}$
  4. $\text{Pr}$
  1. If $P_0$ be the initial principal, then find the solution of differential equation formed in given situation.
  1. $\log\Big(\frac{\text{P}}{\text{P}_0}\Big)=\frac{\text{rt}}{100}$
  2. $\log\Big(\frac{\text{P}}{\text{P}_0}\Big)=\frac{\text{rt}}{10}$
  3. $\log\Big(\frac{\text{P}}{\text{P}_0}\Big)=\text{rt}$
  4. $\log\Big(\frac{\text{P}}{\text{P}_0}\Big)=100\text{rt}$
  1. If the interest is compounded continuously at 5% per annum, in how many years will $₹\ 100$ double itself?
  1. $12.728$ years
  2. $14.789$ years
  3. $13.862$ years
  4. $15.872$ years
  1. At what interest rate will $₹\ 100$ double itself in 10 years? $(\log_\text{e}2 = 0.6931 ).$
  1. $9.66\%$
  2. $8.239\%$
  3. $7.341\%$
  4. $6.931\%$
  1. How much will $₹\ 1000$ be worth at 5% interest after $10$ years$?$ $(e^{0.5} = 1.648).$
  1. $₹\ 1648$
  2. $₹\ 1500$
  3. $₹\ 1664$
  4. $₹\ 1572$
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Order: The order of a differential equation is the order of the highest order derivative appearing in the differential equation.
Degree: The degree of differential equation is the power of the highest order derivative, when differential coefficients are made free from radicals and fractions. Also, differential equation must be a polynomial equation in derivatives for the degree to be defined.
Based on the above information, answer the following questions.
  1. Find the degree of the differential equation $2\frac{\text{d}^2\text{y}}{\text{dx}^2}+3\sqrt{1-\Big(\frac{\text{dy}}{\text{dx}}\Big)^2-\text{y}=0}.$
  1. $3$
  2. $4$
  3. $3$
  4. $1$
  1. Order and degree of the differential equation $\text{y}\frac{\text{dy}}{\text{dx}}=\frac{\text{x}}{\frac{\text{dy}}{\text{dx}}+\Big(\frac{\text{dy}}{\text{dx}}\Big)^3}$ are respectively.
  1. $1, 1$
  2. $1, 2$
  3. $1, 3$
  4. $1, 4$
  1. Find order and degree of the equation $y'" + y^2 + e^{y'} = 0.$
  1. Order $= 3,$ degree $=$ undefined.
  2. Order $= 1,$ degree $= 3.$
  3. Order $= 2,$ degree $=$ undefined.
  4. Order $= 1,$ degree $= 2.$
  1. Determine degree of the differential equation $(\sqrt{\text{a+x}})\times\Big(\frac{\text{dy}}{\text{dx}}\Big)+\text{x}=0.$
  1. $3$
  2. Not defined
  3. $1$
  4. $2$
  1. Order and degree of the differential equation $\Bigg(1+\Big(\frac{\text{dy}}{\text{dx}}\Big)^3\Bigg)^\frac{7}{3}=7\frac{\text{d}^2\text{y}}{\text{dx}^2}$ are respectively.
  1. $2, 1$
  2. $2, 3$
  3. $1, 3$
  4. $1,\ \frac{7}{3}$
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If an equation is of the form $\frac{\text{dy}}{\text{dx}}+\text{Py}=\text{Q},$ where P, Qare functions of x, then such equation is known as linear differential equation. Its solution is given by
$\text{y}\times\text{(I.F.)}=\int\text{Q}\times\text{(I.F.)}\text{dx}+\text{c},$ where $\text{I.F.}=\text{e}^{\int\text{pdx}}.$
Now, suppose the given equation is $(1+\sin\text{x})\frac{\text{dy}}{\text{dx}}+\text{y}\cos\text{x}+\text{x}=0.$
Based on the above information, answer the following questions.
  1. The value of P and Q respectively are:
  1. $\frac{\sin\text{x}}{1+\cos\text{x}},\ \frac{\text{x}}{1+\sin\text{x}}$
  2. $\frac{\cos\text{x}}{1+\sin\text{x}},\ \frac{\text{-x}}{1+\sin\text{x}}$
  3. $\frac{-\cos\text{x}}{1+\sin\text{x}},\ \frac{\text{x}}{1+\sin\text{x}}$
  4. $\frac{\cos\text{x}}{1+\sin\text{x}},\ \frac{\text{x}}{1+\sin\text{x}}$
  1. The value of I.F is:
  1. $1-\sin\text{x}$
  2. $\cos\text{x}$
  3. $1+\sin\text{x}$
  4. $1-\cos\text{x}$
  1. Solution of given equation is:
  1. $\text{y}(1-\sin\text{x})=\text{x+c}$
  2. $\text{y}(1+\sin\text{x})=-\text{x}^2+\text{c}$
  3. $\text{y}(1-\sin\text{x})=\frac{\text{-x}^2}{2}\text{+c}$
  4. $\text{y}(1+\sin\text{x})=\frac{\text{-x}^2}{2}\text{+c}$
  1. If y(0) = 1, then y equals
  1. $\frac{2-\text{x}^2}{2(1+\sin\text{x})}$
  2. $\frac{2+\text{x}^2}{2(1+\sin\text{x})}$
  3. $\frac{2-\text{x}^2}{2(1-\sin\text{x})}$
  4. $\frac{2+\text{x}^2}{2(1-\sin\text{x})}$
  1. Value of is $\text{y}\Big(\frac{\pi}{2}\Big)$ is:
  1. $\frac{4-\pi^2}{2}$
  2. $\frac{8-\pi^2}{16}$
  3. $\frac{8-\pi^2}{4}$
  4. $\frac{4+\pi^2}{2}$
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If the equation is of the form $\frac{\text{dy}}{\text{dx}}=\frac{\text{f(x, y)}}{\text{g(x, y)}}$or $\frac{\text{dy}}{\text{dx}}=\text{F}\Big(\frac{\text{y}}{\text{x}}\Big),$ where f(x, y), g(x, y) are homogeneous functions of the same degree in x and y, then put y = vx and $\frac{\text{dy}}{\text{dx}}=\text{v+x}\Big(\frac{\text{dv}}{\text{dx}}\Big),$ so that the dependent variable y is changed to another variable v and then apply variable separable method.
Based on the above information, answer the following questions.
  1. The general solution of $\text{x}^2\frac{\text{dy}}{\text{dx}}=\text{x}^2+\text{xy}+\text{y}^2$ is:
  1. $\tan^{-1}\frac{\text{x}}{\text{y}}=\log|\text{x}|+\text{c}$
  2. $\tan^{-1}\frac{\text{y}}{\text{x}}=\log|\text{x}|+\text{c}$
  3. $\text{y}=\text{x}\log|\text{x}|+\text{c}$
  4. $\text{x}=\text{y}\log|\text{y}|+\text{c}$
  1. Solution of the differential equation $2\text{xy}\frac{\text{dy}}{\text{dx}}=\text{x}^2+3\text{y}^2$ is:
  1. $x^3 + y^2 = cx^2$
  2. $\frac{\text{x}^2}{2}+\frac{\text{y}^3}{3}=\text{y}^2+\text{c}$
  3. $x^2 + y^3 = cx^2$
  4. $x^2 + y^2 = cx^3$
  1. General solution of the differential equation ($x^2 + 3xy + y^2) dx - x^2 dy = 0$ is:
  1. $\frac{\text{x+y}}{\text{y}}-\log\text{x = c}$
  2. $\frac{\text{x+y}}{\text{y}}+\log\text{x = c}$
  3. $\frac{\text{x}}{\text{x+y}}-\log\text{x = c}$
  4. $\frac{\text{x}}{\text{x+y}}+\log\text{x = c}$
  1. General solution of the differential equation $\frac{\text{dy}}{\text{dx}}=\frac{\text{y}}{\text{x}}\bigg\{\log\Big(\frac{\text{y}}{\text{x}}\Big)+1\bigg\}$ is:
  1. $\log(\text{xy})=\text{c}$
  2. $\log\text{y}=\text{cx}$
  3. $\log\frac{\text{y}}{\text{x}}=\text{cx}$
  4. $\log\text{x}=\text{cy}$
  1. Solution of the differential equation $\Big(\text{x}\frac{\text{dy}}{\text{dx}}-\text{y}\Big)\text{e}^\frac{\text{y}}{\text{x}}=\text{x}^2\ \cos\text{x}$ is:
  1. $\text{e}^\frac{\text{y}}{\text{x}}-\sin\text{x = c}$
  2. $\text{e}^\frac{\text{y}}{\text{x}}+\sin\text{x = c}$
  3. $\text{e}^\frac{\text{-y}}{\text{x}}-\sin\text{x = c}$
  4. $\text{e}^\frac{\text{-y}}{\text{x}}+\sin\text{x = c}$
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State True or False for the following:
The solution of the differential equation $\frac{\text{dy}}{\text{dx}}=\frac{\text{x}+2\text{y}}{\text{x}}$ is $\text{x}+\text{y}=\text{k}\text{x}^2.$
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State True or False for the following:
Solution of $\frac{\text{xdy}}{\text{dx}}=\text{y}+\text{x}\tan\Big(\frac{\text{y}}{\text{x}}\Big)$ is $\sin\Big(\frac{\text{y}}{\text{x}}\Big)=\text{cx}.$
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