Discussion
The zone factor for a given district is obtained from
Answer: B
Correct answer: the zone in which the district falls on the IS 1893 map
IS 1893 tabulates the country by district against zone, and the zone gives the factor - 0.10, 0.16, 0.24 or 0.36 for Zones II to V.
Nothing else about the district enters it. Rainfall, population density and existing building heights have no bearing on how strongly the ground will shake; the classification comes from tectonic setting and the historical record of earthquakes. Districts are used as the unit simply because they give an unambiguous administrative boundary a designer can look a site up in.
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