Engineering Materials
A material is said to be allotropic, if it has

Different crystal structures at different temperatures
Any one of the above
Fixed structure at all temperatures
Atoms distributed in random pattern

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Engineering Materials
Which of the following statement is true about brittle fracture?

Cup and cone formation is characteristic for brittle materials
Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture
Brittle fracture is always preceded by noise
High temperature and low strain rates favour brittle fracture

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