Question Bank • QB_EM_GATE_002 MCQ • 2 Marks

Section 1: Engineering Mathematics

Vector Calculus

Subtopic: Stokes, Gauss and Green's theorems

Question Statement:

Match the Vector Theorems in Group-I with their Mathematical Representations in Group-II: $\begin{array}{|ll|ll|}\hline \textbf{Group-I (Theorem)} & & \textbf{Group-II (Expression)} & \\ \hline \text{P. Green's Theorem in a plane} & & \text{1. } \iint_S (\nabla \times \vec{F}) \cdot \hat{n}\, dS = \oint_C \vec{F} \cdot d\vec{r} \\ \text{Q. Gauss Divergence Theorem} & & \text{2. } \iiint_V (\nabla \cdot \vec{F})\, dV = \iint_S \vec{F} \cdot \hat{n}\, dS \\ \text{R. Stokes' Theorem} & & \text{3. } \oint_C (M\, dx + N\, dy) = \iint_R \left(\frac{\partial N}{\partial x} - \frac{\partial M}{\partial y}\right) dx\, dy \\ \hline \end{array}$ Select the CORRECT matching combination:

Options:

  • (A) P-3, Q-2, R-1
  • (B) P-1, Q-2, R-3
  • (C) P-2, Q-3, R-1
  • (D) P-3, Q-1, R-2

Answer Key:

A

Step-by-Step Solution & Explanation

Standard Integral Theorems: - **P. Green's Theorem**: Relates line integral around $C$ to double integral over planar region $R$ (3). - **Q. Gauss Divergence Theorem**: Relates volume integral of divergence to flux through closed surface $S$ (2). - **R. Stokes' Theorem**: Relates surface integral of curl over $S$ to circulation around boundary $C$ (1). Correct match: **P-3, Q-2, R-1**.
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