What is the approximate upper altitude of the troposphere as given in the material?

• A. 30,000 ft
• B. 60,000 ft
• C. 90,000 ft
• D. 120,000 ft

Answer: (B)

The question is about where the troposphere ends—the boundary with the stratosphere, known as the tropopause. That height isn’t a single fixed number; it varies with latitude and season. In the material you’re studying, a representative value given for the upper limit of the troposphere is about 60,000 feet, which makes sense because the tropopause is highest in the tropical regions and can approach that height. The weather and most flight-related activity occur inside the troposphere, so using a tropical-level approximation around 60,000 feet is a practical standard in many training materials. The other options would place you either well into the boundary area of the mid-latitude troposphere or up into the lower stratosphere, which is beyond the troposphere.