निम्नलिखित में से कौन सी ढलवां छत (pitched roof) चार दिशाओं में चार ढलान वाली सतहों द्वारा निर्मित होती है जो चार ढलान वाले त्रिभुज बनाती है?

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?