Allied & ICAR Exam Bank • ALLIED_0062 MCQ • 1 Mark

Section 1: Engineering Mathematics

Vector Calculus

Subtopic: Divergence and curl

Question Statement:

If $\vec{v} = \vec{\omega} \times \vec{r}$ represents rigid body rotation with constant angular velocity $\vec{\omega}$, then $\nabla \times \vec{v}$ equals:

Options:

  • (A) $2\vec{\omega}$
  • (B) $\vec{\omega}$
  • (C) $\vec{0}$
  • (D) $\frac{1}{2}\vec{\omega}$

Answer Key:

A

Step-by-Step Solution & Explanation

For rigid body rotation, the vorticity is twice the angular velocity: $\text{curl}(\vec{v}) = 2\vec{\omega}$.
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