Q1: Which of the following hardness tests does not measure the indentation hardness of metals and alloys ?

ANS:B - Shore sceleroscope test.

The Shore scleroscope test does not measure the indentation hardness of metals and alloys. Explanation:

1. Vickers Hardness Test: This test measures the hardness of a material by pressing a pyramid-shaped indenter into the surface of the material. The hardness is determined by the size of the indentation left by the indenter.
2. Brinell Hardness Test: In this test, a hardened steel ball is pressed into the surface of the material being tested under a known load. The diameter of the resulting indentation is measured, and the hardness is calculated based on the applied load and the diameter of the indentation.
3. Rockwell Hardness Test: This test measures the depth of penetration of an indenter into the material under a specified load. The Rockwell hardness number is determined by the difference in depth between the initial and final positions of the indenter.
4. Shore Scleroscope Test: Unlike the other hardness tests mentioned, the Shore scleroscope test does not measure indentation hardness. Instead, it measures the rebound height of a diamond-tipped hammer dropped onto the surface of the material being tested. The hardness is determined by the ratio of the rebound height to the height of the initial drop.

In summary, while Vickers, Brinell, and Rockwell hardness tests measure indentation hardness using different methods, the Shore scleroscope test measures hardness based on rebound height and does not involve indentation of the material's surface. Therefore, the correct answer is the Shore scleroscope test.