Multiple choice What is the range of diameter of the region consisting the centre of a cyclone? 10 – 15 km 10 – 30 km 30 – 40 km 15 – 30 km Reveal answer Fill a bubble to check yourself B Correct answer Explanation The centre of a cyclone is a calm area called the eye of storm. Its diameter is about 10 – 30 km. This region is free of clouds and has light winds.