28 FEBRUARY 2021 CURRENT AFFAIRS QUIZ

None of these

Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C

Heated up to the lower critical temperature and then cooled in still air

Heated below the lower critical temperature and then cooled slowly

Grain growth, stress relief, recrystallization

Grain growth, recrystallization, stress relief

Stress relief, recrystallization, grain growth

Stress relief, grain growth, recrystallization

None of these

Deformation under stress

Externally applied forces with breakdown or yielding

Fracture due to high impact loads

Modify the structure of the material

Any one of these

Change grain size

Relieve the stresses set up in the material after hot or cold working

Admiralty metal

Cast iron

Brass

Cast steel

Amorphous material

Crystalline material

None of these

Mesomorphous material

Pig iron

Cast iron

Wrought iron

Malleable iron

0.008

0.00025

0.017

0.0026

Inducing hardness by continuous process

Heating and cooling rapidly

Increasing hardness throughout

Hardening surface of work-piece to obtain hard and wear resistant surface

85 - 92% copper and rest tin with little lead and nickel

70% copper and 30% zinc

90% copper and 10% tin

70 - 75% copper and rest tin