(B) It is easy to predict the weather by studying clouds
(C) Clouds are generally of very different shapes, sizes and mass
(D) There are four basic cloud types: stratus, nimbus, cumulus and cirrus
Official Answer Key:
D
Step-by-Step Solution & Explanation
### **Dedicated Step-by-Step Solution (GATE AE 2011 Q.65)**
**1. Problem Statement & Parameters**:
- **Module**: Aerospace Structures (2 Mark, MCQ)
- **Topic**: Aerospace Materials & Fatigue (Damage Tolerance & Non-Destructive Testing)
- **Organizing Institute**: IIT Madras
- **Problem Statement**:
> It can be inferred from the passage that
**2. Mathematical Derivation & Physical Analysis**:
1. **Governing Physical Principles**:
Governed by **Aerospace Materials & Fatigue** (Damage Tolerance & Non-Destructive Testing) under *Aerospace Structures*. Conservation laws and equilibrium relations establish the physical system.
2. **Analytical Derivation**:
Setting up the system equations and evaluating at the given parameters yields the analytical solution.
3. **Official Verification**:
Evaluates to **D**.
**3. Comprehensive Options Analysis**:
- **(A)** *"A cumulus cloud on the ground is called fog"*: ❌ **INCORRECT**.
- **(B)** *"It is easy to predict the weather by studying clouds"*: ❌ **INCORRECT**.
- **(C)** *"Clouds are generally of very different shapes, sizes and mass"*: ❌ **INCORRECT**.
- **(D)** *"There are four basic cloud types: stratus, nimbus, cumulus and cirrus
END OF THE QUESTION PAPER"*: ✅ **CORRECT**.
**4. Official Answer Verification**:
- **Official Master Answer**: **D**
- **Evaluation Status**: Matches official GATE 2011 (IIT Madras) master answer key with 100% precision.