Engineering Materials
The ratio of the volume occupied by the atoms to the total volume of the unit cell is called

Coordination number
Space lattice
Atomic packing factor
None of these

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Engineering Materials
Aluminium bronze contains

90% magnesium and 9% aluminium with some copper
94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
10% aluminium and 90% copper
92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg

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Engineering Materials
Points of arrest for iron correspond to

There is nothing like points of arrest
Stages at which allotropic forms change
Stages at which properties do not change with increase in temperature
Stages at which further heating does not increase temperature for some time

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