B2_EC A-group

Choose the CORRECT response for following ,

Statement 1- Thermoplastic polymer includes secondary bonds among the polymeric chains.

Statement 2- Thermosetting polymer includes primary bonds among the polymeric chains.

• Statement 1) is true while 2) is false.

• Statement 1) is false while2) is true.

• Both statements 1) and 2) are true.

• Both statements 1) and 2) are false.

From the following the synthetic polymer is,

• wool

• Cellulose

• DNA

• polyacrylonitrile

The polymerization of phenol and formaldehyde generate the polymer…….

• D. Bakelite
• Urea-formaldehyde

• Nylon 6,6

• Kevlar

The polymerization of phenol and formaldehyde can generate the polymer…….

• Phenol-formaldehyde

• Novolak

• All of these

• Bakelite

The polymerization of glycol and diisocyanate generate the polymer…….

• Phenol-formaldehyde

• Novolak

• Poly-urethane

• Bakelite

Stainless steel with high strength but low corrosion resistance is known

• A. Austenitic stainless steel

• B. Ferritic stainless steel

• C. Martensitic stainless steel

• D. Duplex stainless steel

Carbon nanotubes consist of which configuration structure among the following.

• A. Zigzag and Armchair configuration

• B. Oval configuration

• C. Plane two dimensional configuration

• D. E and Z configuration

Drawback of plane carbon steel is

• A. With increasing percentage of carbon ductility decreases

• B. Cannot be deep hardened by heat treatment

• C. Mechanical property alters at higher temperature

• D. All of these

Which among the following can be idealized as cutouts from a two-dimensional graphene sheet rolled up to form a hollow cylinder?

• A. Single-walled carbon nanotubes

• B. Multi-walled carbon nanotubes

• C. Graphene oxide

• D. None of these

Two dimensional sheet carbon of connected to its three nearest neighbors by sigma-bonds and a delocalized pi-bond is called as,

• A. graphene

• B. borazine

• C. benzene

• D. none of these