| Assertion [A]: A jet aircraft moving at Mach Number equal to 1 travels faster at an altitude of 15 km than while moving at Mach Number equal to 1 near the sea level. |
| Reason [R]: The velocity of sound depends on the temperature of the surrounding medium. [IAS Prelim] |
A) Both A are R are true and R is the correct explanation of A
B) Both A and R are true but R is not a correct explanation of A
C) A is true but R is false
D) A is false but R is true
Correct Answer: D
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