USCG Exam Practice · Light List, ranges, and light characteristics
Which statement correctly distinguishes an Occulting (Oc) light from a Flashing (Fl) light?
- AAn Occulting light has a longer period of darkness than light; a Flashing light has equal periods
- BAn Occulting light has a longer period of light than darkness; a Flashing light has a longer period of darkness than light✓ correct
- CAn Occulting light shows equal periods of light and darkness; a Flashing light has a longer period of light
- DAn Occulting light shows a single flash per period; a Flashing light shows multiple flashes per period
Why B is correct
Occulting (Oc) is a continuous light interrupted by eclipses where the duration of light exceeds the duration of darkness. Flashing (Fl) is the opposite — the duration of light is shorter than the duration of darkness. The Light List explicitly states Occulting is the 'opposite of flashing.'
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