A material behaves in certain ways above and below the proportional limit on a stress strin curve, which of the following is correct________?

Modulus of elasticity means________?

Back pressure porosity can be avoided by________?

Which of the following impression materials is easy to pour and difficult to remove the stone cast from the impression?

Which one of the following impression materials is elastic, sets by a chemical reaction and is catalyzed by chloroplatinic acid________?

Acrylic (cold cure)________?