GATE_AE_2027_MOCK_02_Q21 GATE 2027 Aerospace Engineering All-India Master Mock 02 (Compressible Aerodynamics & High-Speed Propulsion) MCQ · 1 Mark
Flight Mechanics & Space Dynamics • Atmospheric Flight Mechanics • ISA Atmosphere & Drag Polars

In the International Standard Atmosphere (ISA) troposphere (from sea level up to 11 km), the temperature lapse rate $\lambda = -\frac{dT}{dh}$ is approximately:

(A) $6.5\text{ K/km}$
(B) $9.8\text{ K/km}$
(C) $0.0\text{ K/km}$
(D) $3.0\text{ K/km}$
Answer Key:
A

Step-by-Step Verified Solution

### Solution: In the ISA troposphere, temperature decreases linearly at a lapse rate of $6.5\text{ K/km}$ (or $0.0065\text{ K/m}$). Correct: A.
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