List of top Mechanical Metallurgy Questions on Non-Destructive Testing asked in GATE MT

Match the descriptions listed in Column I with the corresponding non-destructive testing methods listed in Column II.

Column I	Column II
(P) Internal flaws in railroad wheel	(1) Ultrasonic
(Q) In-service monitoring of crack	(2) Radiography
(R) Inclusion in mild steel	(3) Dye Penetrant
(S) Surface crack in Al-based alloy	(4) Acoustic Emission