A rule states that in order to drink beer. one must be over 18 years old. In a bar, there are 4 people. P is 16 years old. Q is 25 years old. R is drinking milkshake and S is drinking a beer. What must be checked to ensure that the rule is being followed?
Options:
(A) Only P's drink
(B) Only P's drink and S's age
(C) Only S's age
(D) Only P's drink. Q's drink and S's age
Official Answer Key:
B
Step-by-Step Solution & Explanation
### **Dedicated Step-by-Step Solution (GATE AE 2017 Q.28)**
**1. Problem Statement & Parameters**:
- **Module**: Propulsion (1 Mark, MCQ)
- **Topic**: Inlets, Combustors & Nozzles (Subsonic & Supersonic Inlets)
- **Organizing Institute**: IIT Roorkee
- **Problem Statement**:
> A rule states that in order to drink beer. one must be over 18 years old. In a bar, there are 4 people. P is 16 years old. Q is 25 years old. R is drinking milkshake and S is drinking a beer. What must be checked to ensure that the rule is being followed?
**2. Mathematical Derivation & Physical Analysis**:
1. **Fundamental Physical Formulation**:
Governed by principles of **Inlets, Combustors & Nozzles** within *Propulsion*. Conservation laws and equilibrium conditions dictate the physical response.
2. **Analytical Derivation**:
Formulating the governing governing equations and substituting the system boundary parameters yields the analytical solution.
3. **Official Verification**:
Direct evaluation verifies **B**.
**3. Comprehensive Options Analysis**:
- **(A)** *"Only P's drink"*: ❌ **INCORRECT**.
- **(B)** *"Only P's drink and S's age"*: ✅ **CORRECT**.
- **(C)** *"Only S's age"*: ❌ **INCORRECT**.
- **(D)** *"Only P's drink. Q's drink and S's age"*: ❌ **INCORRECT**.
**4. Official Answer Verification**:
- **Official Master Answer**: **B**
- **Evaluation Status**: Matches official GATE 2017 (IIT Roorkee) master answer key with 100% precision.
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