The abbreviation PDI refers to:
(a) name of the polymer
(b) polydispersity index of polymer
(c) application of polymer
(d) poly diagonal index

The monomer units of silicons a water repellant, acid resistant and heat resistant polymer is:

(a) Si                          (b) SiO₂

(c) R₂SiO                    (d) none of these

The monomer units of PTFE are:

1. Cl₂CH-CH₃

2. F₂C=CF₂

3. F₃C-CF₃

4. FClC=CF₂

Which of the following natural products is not a polymer ?

(a) DNA

(b) Cellulose

(c) ATP

(d) Urease

Which of the following is wrong?
1. PMMA is called plexiglass
2. PTFE is called teflon
3. SBR is called natural rubber
4. LDPE is called low density polyethylene

Nylons, polyesters and cotton, all possess strength due to:

(a) intermolecule H-bonding

(b) van der Waals’ attraction

(c) dipole-dipole interaction

(d) none of the above

The catalyst used in the manufacture of polythene by Ziegler method is:
1. Titanium tetrachloride and triphenyl galium 
2. Titanium tetrachloride and triethyl aluminium
3. Titanium dioxide
4. Titanium isopropoxide

Of the following the step growth polymer is : 

1. Bakelite

2. Polyethylene

3. Teflon

4. PVC

Condensation of caprolactam gives:

1. Nylon-6,6               

2. Nylon-6

3. Nitrile rubber         

4. Nylon-6,10

Natural silk and artificial silk differ in one respect that one of them contains:

(a) N                      (b) S

(c) P                       (d) none of these