Why do soldiers march disorderly while crossing a bridge?
-
To prevent resonance on the bridge
- To set the bridge into resonance
- To make the b ridge collapse
- To spread their weight evenly on the bridge
The correct answer is: A
Explanation
Soldiers march disorderly while crossing a bridge to prevent resonance because when soldiers march in orderly manner across a bridge, they generate a rhythmic oscillation of wave on the bridge and at a certain point, would start oscillation to the same rhythm as that of the marching steps. This oscillation would reach a maximum peak when the bridge can no longer sustain its own strength and hence collapses. So for this reasons, soldier are ordered to march disorderly while crossing a bridge.
There is an explanation video available .