Question types

Differential Equations question types

201 questions across 6 question groups — pick any mix to generate a Maths paper with step-by-step answer keys.

201
Questions
6
Question groups
5
Question types
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.

Q 1MCQ1 Mark
If the surrounding air is kept at 20°C and the body cools from 80°C to 70°C in 5 minutes, the temperature of the body after 15 minutes will be…..
  • A
    51.7°C
  • 54.7°C
  • C
    52.7°C
  • D
    50.7°C

Answer: B.

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Q 2MCQ1 Mark
The decay rate of certain substances is directly proportional to the amount present at that instant. Initially, there are 27 grams of substance and 3 hours later it is found that 8 grams left. The amount left after one more hour is……
  • A
    $5 \frac{2}{3}$ grams
  • $5 \frac{1}{3}$ grams
  • C
    5.1 grams
  • D
    5 grams

Answer: B.

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Q 3MCQ1 Mark
$\frac{x^2}{a^2}-\frac{y^2}{b^2}=1$ is a solution of
  • A
    $\frac{d^2 y}{d x^2}+y x+\left(\frac{d y}{d x}\right)^2=0$
  • $x y \frac{d^2 y}{d x^2}+2\left(\frac{d y}{d x}\right)^2-y \frac{d y}{d x}=0$
  • C
    $y \frac{d^2 y}{d x^2}+2\left(\frac{d y}{d x}\right)^2+y=0$
  • D
    $x y \frac{d y}{d x}+y \frac{d^2 y}{d x^2}=0$

Answer: B.

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Q 4MCQ1 Mark
The particular solution of $\frac{d y}{d x}=x e^{y-x}$, when $x = y =0$ is......
  • $e^{x-y}=x+1$
  • B
    $e^{x+y}=x+1$
  • C
    $e^x+e^y=x+1$
  • D
    $e^{y-x}=x-1$

Answer: A.

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Q 5MCQ1 Mark
The solution of the differential equation $\frac{d y}{d x}=\sec x-y \tan x$ is.......
  • A
    y sec x + tan x = c
  • y sec x = tan x + c
  • C
    sec x + y tan x = c
  • D
    sec x = y tan x + c

Answer: B.

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A person’s assets start reducing in such a way that the rate of reduction of assets is proportional to the square root of the assets existing at that moment. If the assets at the beginning are ₹ 10 lakhs and they dwindle down to ₹ 10,000 after 2 years, show that theperson will be bankrupt in $2 \frac{2}{9}$ years from the start.
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