Please indicate True or False and give the proper reason Sho

Please indicate True or False and give the proper reason. Showing it clearly please, thanks a lot

1, The elastic strain in polymers comes from the stretching and rotation of the carbon chains T/F

2, The plastic strain in polymers occurs when the carbon chains slide past each other T/F

3, The elastomer used to make rubber bands has cross links where as the elastomer used to make car tyres does not T/F

4, Elastomers stretch because the carbon chains are coiled like springs T/F

Solution

1. True . Elastic strain comes due to stretching and once the load is removed the carbon chains becomes unstretched and comes to intial state.

2. True . Plastic strain is the permanent deformation which occurs due to shearing, when the carbon chains slide past each other it produces a shear effect .

3. False . Cross linking of polymers causes the polymer to become very hard which is used in tyres and not in rubber band.

4. False. Carbon chains are not coiled like spring s but yes they do stretch.