9th Physics new book 2025 | screw gauge | lecture#7 | Chapter1

Chapter 1: Physical Quantities and Measurements, Topic: 1.5 length measuring instruments, Micrometer screw gauge. #physics #new #book #9th #class9 #lecture #chapter1 #2025 #study Screw gauge class 9th 9th physics new book 2025 grade 9 new book physics lectures ustadshani2