Amount of volumetric polymerization shrinkage seen in composites during curing is:: (A) 0.5-2%, (B) 1.7-5.7%, (C) 5.2-9.8%, (D) 12.8-17.76%
Answer is B. Linear shrinkage is about 0.2 to 2%.
Volumetric shrinkage is 1.7-5.7%.
Shrinkage is seen towards the centre in self cure materials and towards the light source in light cure materials. 
Reference : Nisha Garg 2ND ed Pg: 310