Which of the following indicators shows vertical speed?

• A. The altimeter
• B. The vertical speed indicator (VSI)
• C. The attitude indicator
• D. The airspeed indicator

Answer: (B)

The vertical speed indicator (VSI) is specifically designed to show the rate of climb or descent of an aircraft, typically in feet per minute or meters per second. It provides pilots with essential information about how quickly the aircraft is changing its altitude. This is particularly valuable during ascent or descent phases of flight, allowing for appropriate adjustments to be made to maintain desired performance and safety.

In contrast, the altimeter measures the current altitude of the aircraft relative to sea level but does not convey any information about the rate of that altitude change. The attitude indicator displays the aircraft's orientation concerning the horizon, helping pilots understand their climb, bank, or pitch angles, but again lacks vertical speed data. The airspeed indicator shows the aircraft's speed relative to the air surrounding it, which is unrelated to vertical movement. Thus, the VSI is the only indicator among the options provided that directly indicates vertical speed.