railway RRB JE (CBT I + CBT II) Mock Test 2024 Production Engineering (Manufacturing) Machining Processes and Machine Tools
Arrange the materials in increasing order of their hardness.
1
Common glass < Aluminium oxide < Hardened steel < Diamond
2
Aluminium oxide < Common glass < Hardened steel < Diamond
3
Common glass < Hardened steel < Aluminium oxide < Diamond
4
Common glass < Aluminium oxide < Diamond < Hardened steel