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1.
Match the following group 1 items(rubbers) with group 2 items (Rubber formation) and select the correct option
1. Nitrate rubbers ----------------------------------- copolymerization of butadiene and styrene
2. Butadiene rubbers ------------------------------- polymerization of isobutylene with isoprene
3. Neoprenes ----------------------------------------- copolymerization of butadiene and crylonitrite
4. Butyl rubbers ------------------------------------- polymerization of chloroprene molecules
2.
What is meant work hardening process?
3.
Energy required for deformation can be calculated using the formula
4.
In which type of point defect, positive and negative ions are missing from the crystal?
5.
Body centered cubic structure has an atomic packing factor equal to
6.
Match the following group 1 items (crystal structures) with group 2 items (average number of atoms per unit cell) and select the correct option
1. Simple cubic crystal structure ----------------- 2
2. Body centered crystal structure --------------- 6
3. Face centered crystal structure ---------------- 1
4. Hexagonal close packed structure ------------ 4
1. Simple cubic crystal structure ----------------- 2
2. Body centered crystal structure --------------- 6
3. Face centered crystal structure ---------------- 1
4. Hexagonal close packed structure ------------ 4