alleryStart learning →An altimeter in an aircraft measures
AOutside air temperature of the aircraft
BGround speed of the aircraft over land
CAltitude from atmospheric pressure change
DMagnetic heading direction of aircraft
Answer & Solution
Correct answer: C. Altitude from atmospheric pressure change
1. The chapter section on applications mentions altimeters.
2. They are sensitive barometers calibrated in altitude.
3. Lower pressure means higher altitude.
4. So option A is correct.
_Source: Selina Concise Physics Class 9, Ch 4 Pressure in Fluids and Atmospheric Pressure (Mistral OCR'd PDF), section on altimeter_
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