need help from question 1 to 4

2. The indenter used in hardness testers are produced from extremely hard materials, such as those listed in the table in question 1. Explain the need to use such materials for producing the indenters. (12 marks) 3. For both types of hardness tests, the test surface of the specimens were polished before testing. Why is it necessary to polish the test surface of the specimens? (12 marks) 4. From the results obtained from both tests, which material (copper or steel) is harder? (4 marks) 5. List three sources of errors when conducting both hardness tests. Also comment on how such errors can be minimised