Allied & ICAR Exam Bank • ALLIED_1016 MCQ • 1 Mark

Section 1: Engineering Mathematics

Differential Equations

Subtopic: Cauchy-Euler equations

Question Statement:

The general solution of the Cauchy-Euler differential equation $x^2 \frac{d^2 y}{dx^2} - 2x \frac{dy}{dx} + 2y = 0$ for $x > 0$ is:

Options:

  • (A) y = c_1 x + c_2 x^2
  • (B) y = c_1 x^2 + c_2 x^3
  • (C) y = c_1 x + c_2 \ln(x)
  • (D) y = (c_1 + c_2 \ln x) x^2

Answer Key:

A

Step-by-Step Solution & Explanation

Substituting $x = e^z$ or trying $y = x^m$: $m(m-1) - 2m + 2 = 0 \implies m^2 - 3m + 2 = 0 \implies (m-1)(m-2) = 0$. The roots are $m_1 = 1, m_2 = 2$. Thus $y = c_1 x + c_2 x^2$.
← Previous (ALLIED_1015) Next (ALLIED_1017) →

Practice In Authentic CBT Exam Interface

Test your skills under authentic timed conditions with live scoring and AIR percentile ranking.

Launch CBT Mock Test