5) To reduce internal stresses of a hardened tool, the method of heat treatment generally applied is

Stabilising

Annealing

Normalizing

Tempering

Answer is:

Tempering

Annealing

Normalizing

Tempering

Case hardening

Answer is:

Cyaniding

Nitriding

Carburizing

Ammonising

Answer is:

Hardening

Case Hardening

Tempering

Normalizing

Answer is:

Explanation:

List of case hardening or surface hardening methods are
Carburising
Cyaniding
Nitriding
Induction hardening
Flame hardening

To induce internal stresses

To build up hardening structure

To fall off the scale

To retain it to its original structure

Answer is:

Explanation:

After heating up to required hardening temperature, tool steels be quenched to build up hardening structure.