अनियमितताएं जो खरोंच, दरारें और दाग जैसे विशेष कारणों से अलगाव में या कभी-कभार होती हैं, क्या कहलाती हैं?

The difference between the upper limit and the lower limit of a dimension is called:

What is the least count of a typical Vernier caliper where 10 divisions on the Vernier scale coincide with 9 divisions on the main scale (given 1 main scale division = 1 mm)?

Why is inspection easier in a hole basis system?