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How much of an arc over the horizon does an all-round light cover?

  1. 180 degrees

  2. 225 degrees

  3. 360 degrees

  4. 135 degrees

The correct answer is: 360 degrees

An all-round light is designed to provide visibility in all directions, so it covers a full 360 degree arc over the horizon. Option A is incorrect because 180 degrees would only cover half of the horizon. Option B is incorrect because 225 degrees is less than a full circle and would not provide visibility in all directions. Option D is incorrect because 135 degrees is less than a full circle and would not provide visibility in all directions.