[amp_mcq option1=”5.5 m” option2=”6.5 m” option3=”7.5 m” option4=”8.5 m” correct=”option3″]
The correct answer is: C. 7.5 m
A semaphore signal is a type of railway signal that uses two arms to indicate the direction of travel. The arms are mounted on a post that is typically 7.5 m tall. The arms are painted red and white, and they can be moved up or down to indicate whether trains can proceed or must stop.
Option A is incorrect because the height of the center of arm of a semaphore signal above the ground is 7.5 m, not 5.5 m.
Option B is incorrect because the height of the center of arm of a semaphore signal above the ground is 7.5 m, not 6.5 m.
Option D is incorrect because the height of the center of arm of a semaphore signal above the ground is 7.5 m, not 8.5 m.