भवन निर्माण सामग्री में नमी के वायुमंडलीय सूखने के कारण इमारतों में दरारें उत्पन्न होती हैं, इन्हें क्या कहते हैं?

Which of the following statements conform(s) to panel walls in building construction? 1. Panel walls are external load bearing walls. 2. They are self supporting walls subjected to lateral loads. 3. They are primarily used in framed structures.

Which of the following statements conforms to 'corbels' in masonry?