A wedge like tool is used for removing the taper shank tools from the nose of the machine spindle. What is this called ?

Blind hole

A hole, which is not made through full depth of the component is known as blind hole.

Drills above 31.75 mm up to 50.50 mm

For Morse Taper MT-4 the range starts from 31.7 mm and till 50.50 mm (Approx).

Scraper

Scrapers are used to correct slight errors on all flat or curved surfaces that must be finished more decoratively.
Scraping is used to produce a high degree of fit between two flat or two curved surfaces particularly where the surfaces can rub together in use.

All of the above

The cutting action of the file tool depends on type of cut and spacing of teeth, arrangement of teeth on the file, size and shape of the file.