असामान्य वृद्धि के कारण इमारती लकड़ी (timber) में निम्नलिखित में से किस दोष में अनुदैर्ध्य दरारें होती हैं जो आमतौर पर वार्षिक वलयों के लंबवत होती हैं?

As per IS 303 and IS 10701, what is the recommended minimum thickness of '3 ply' plywood board for structural purposes?

Which of the following statements is/are correct regarding 'Plywood'? I. A wood panel glued under pressure from an odd number of layers of veneers is known as plywood. II. BWR grade and MR grade are classifications of plywood based on grade.