Which scientific instrument is used to measure the height of an aircraft above a fixed level?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4. i.e. Altimeter.
- Altimeter is a device that measures altitude, the distance of a point above sea level.
- It is an important navigation instrument for aircrafts and spacecraft pilots who monitor their height above earth's surface.
- Skydivers and mountaineers also use altimeters to pinpoint their location in the sky or on the ground.