Which of the following dimensions has a basic size of 30 mm and a total tolerance of 0.06 mm?

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)?

A wedge-shaped job was measured using a 250 mm sine bar. The top edge was found to be perfectly horizontal when slip gauges of total height 125 mm were placed under one of the rollers. Find the angle of the wedge.