Q. Railway wagon axles are made by heating iron rods embedded in charcoal powder. This process is known as
A) Tempering
B) Case hardening
C) Sherardising
D) Annealing
Explanation
(a)
Annealing is the process of cooling a hot molten metal slowly. Railway wagon axles are made by heating iron rods embeded in charcoal powder (annealing) so that those might not break due to sudden change in temperature.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.