ionic bond

covalent bond

metallic bond

none of these

line defect

surface defect

point defect

none of these

Vacancy

Interstitial imperfection

Frenkel imperfection

all of these

core defects

surface defect

superficial defects

temporary defects

High temperature and low strain rates favor brittle fracture

Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture

Brittle fracture is always preceded by noise

Cup and cone formation is characteristic for brittle materials