GATE_AE_2027_MOCK_01_Q21 GATE 2027 Aerospace Engineering All-India Master Mock 01 (Foundation & Standard Core Calibration) MCQ · 1 Mark
Flight Mechanics & Space Dynamics • Atmospheric Flight Mechanics • Standard Atmosphere Properties

In the International Standard Atmosphere (ISA) isothermal stratosphere between $11\text{ km}$ and $20\text{ km}$ altitude, the ambient temperature is constant at:

(A) 216.65 K (-56.5 °C)
(B) 288.15 K (15.0 °C)
(C) 250.00 K (-23.15 °C)
(D) 180.50 K (-92.65 °C)
Answer Key:
A

Step-by-Step Verified Solution

### Solution: From $11\text{ km}$ to $20\text{ km}$, the ISA defines an isothermal layer at $T = 216.65\text{ K}$ ($-56.5^\circ\text{C}$). Correct: A.
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