Why are soldiers required to break their march before stepping onto any bridge?
Correct answer: C. To prevent the bridge collapsing due to resonance
- A. To prevent the noise created from marching disturbing the life beneath the bridge
- B. To prevent injury from marching on an incline
- C. To prevent the bridge collapsing due to resonance
- D. To not produce sound which may easily be heard by enemies on the other side
Explanation
At a certain point, the bridge would start oscillating 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. Therefore, soldiers are ordered to break their steps while crossing a bridge
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Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
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