IS 1893 (भाग 1) के अनुसार भूकंपरोधी संरचना के डिजाइन में, अस्पताल जैसी महत्वपूर्ण सेवा और सामुदायिक भवन के लिए महत्व कारक (Importance Factor - I) का मान कितना लिया जाता है?

In earthquake-resistant design, structural ductility is crucial because it:

A soft storey in a multi-storey building is developed primarily due to a change in which characteristic of that storey?

Consider the following statements related to base/shock isolation concepts in earthquake-resistant design: 1. Base-isolation concepts are generally applied to earthquake-resistant structures to reduce seismic energy transmission. 2. The shock-isolation concept is a radical departure from conventional seismic design practices that rely on structural ductility. 3. The successful implementation of base-isolation concepts will ensure the dramatic simplification in the design of very tall reinforced concrete structures without any high-frequency limitations. Which of the above statements are correct?