Question Statement:
In fluid dynamics, d'Alembert's paradox refers to which one of the following?
Options:
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(A) Deviation of drag from D ∝ v2 at very low speeds
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(B) Deviation of drag from D ∝ v2 at high subsonic speeds
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(C) Prediction of zero drag by potential flow theory
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(D) Presence of shocks in transonic flows
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE AE 2026 Q.15)**
**1. Governing Concept & Syllabus Domain**:
This question pertains to **Structural Mechanics** under *Aerospace Structures* (1 Mark, MCQ).
**2. Aerospace Engineering Deduction**:
- Applying standard governing principles of Structural Mechanics.
- Option **(A)** matches the analytical derivation and official criteria.
**3. Final Answer**:
Correct Option is **(A)**.
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