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JEE (Main) Mathematics Questions

JEE (Main) Mathematics Questions

31. The general solution of the linear differential equation \( \frac{dy}{dx} + P(x)y = 0 \) is:
  1. y = Ce-∫P(x)dx
  2. y = Ce∫P(x)dx
  3. y = Cx + P(x)
  4. None of these

Answer: a) y = Ce-∫P(x)dx

32. For the differential equation \( \frac{dy}{dx} + 3y = 0 \), the integrating factor (IF) is:
  1. e-3x
  2. e3x
  3. 3x
  4. e1/3 x

Answer: a) e-3x

33. The solution of \( \frac{dy}{dx} - 2y = e^{3x} \) is:
  1. y = Ce2x + e3x
  2. y = Ce2x + 1/5 e3x
  3. y = Ce-2x + e3x
  4. y = e3x + e2x

Answer: b) y = Ce2x + 1/5 e3x

34. The equation \( \frac{dy}{dx} + \frac{1}{x}y = x^2 \) is:
  1. Homogeneous
  2. Non-homogeneous
  3. Exact
  4. Linear

Answer: b) Non-homogeneous

35. In the equation \( \frac{dy}{dx} + P(x)y = Q(x) \), the solution is given by:
  1. \( y = \frac{1}{\mu} \int \mu Q(x) dx + C \), where \( \mu = e^{\int P(x) dx} \)
  2. \( y = \mu \int \frac{1}{Q(x)} dx \), where \( \mu = e^{-\int P(x) dx} \)
  3. y = CeP(x) + Q(x)
  4. y = Ce-P(x) + Q(x)

Answer: a) \( y = \frac{1}{\mu} \int \mu Q(x) dx + C \), where \( \mu = e^{\int P(x) dx} \)

36. The integrating factor of \( \frac{dy}{dx} + \frac{2}{x}y = x^3 \) is:
  1. x-2
  2. x2
  3. x4
  4. x-4

Answer: b) x2

37. If \( \frac{dy}{dx} + y = e^{2x} \), the particular solution is:
  1. \( y = \frac{1}{3}e^{2x} + Ce^{-x} \)
  2. \( y = Ce^{x} + e^{2x} \)
  3. \( y = \frac{1}{2}e^{2x} - Ce^{-x} \)
  4. \( y = Ce^{-x} - \frac{1}{3}e^{2x} \)

Answer: a) \( y = \frac{1}{3}e^{2x} + Ce^{-x} \)

38. For the linear equation \( \frac{dy}{dx} + \frac{3}{x}y = x^2 \), the integrating factor is:
  1. x-3
  2. x3
  3. ex^2
  4. x

Answer: b) x3

39. The differential equation \( \frac{dy}{dx} = y - x \) is:
  1. Linear
  2. Non-linear
  3. Homogeneous
  4. Exact

Answer: a) Linear

40. The general solution of \( \frac{dy}{dx} + ky = 0 \) is:
  1. y = Ce-kx
  2. y = Cekx
  3. y = C + kx
  4. None of these

Answer: a) y = Ce-kx

41. For the equation \( \frac{dy}{dx} - \frac{1}{x}y = x \), the integrating factor is:
  1. e1/x
  2. eln(x)
  3. x
  4. ln(x)

Answer: b) eln(x)

42. The particular solution of \( \frac{dy}{dx} + y = \sin(x) \) is:
  1. y = Ce-x + \( \sin(x) - \cos(x) \)
  2. y = Cex + \( \sin(x) - \cos(x) \)
  3. y = Ce-x + \( \cos(x) + \sin(x) \)
  4. y = Cex - \( \cos(x) - \sin(x) \)

Answer: a) y = Ce-x + \( \sin(x) - \cos(x) \)

43. In the linear equation \( \frac{dy}{dx} + P(x)y = Q(x) \), if \( Q(x) = 0 \), the equation is called:
  1. Non-linear
  2. Homogeneous
  3. Exact
  4. Linear

Answer: b) Homogeneous

44. The solution of \( \frac{dy}{dx} + y = 0 \) with initial condition \( y(0) = 1 \) is:
  1. y = ex
  2. y = e-x
  3. y = ex-1
  4. y = e-x+1

Answer: b) y = e-x

45. The general solution of \( \frac{dy}{dx} + 2y = e^x \) is:
  1. y = Ce-2x + \( \frac{e^x}{2} \)
  2. y = Ce2x + \( \frac{e^x}{2} \)
  3. y = Ce-2x + \( \frac{e^x}{4} \)
  4. y = Ce-2x + \( e^x \)

Answer: a) y = Ce-2x + \( \frac{e^x}{2} \)



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