B2_EC E-group

Which of the following method is adopted for preventing corrosion by moisture?

• Deaeration

• Removal by using ion-exchange resin

• Neutralization with lime

• Dehumidification

Boron carbonitrides can be synthesized by using,

• benzene

• borazines

• quartz

• piezoelectric materials

SOL GEL,

• is a top-down approach of synthesis of nano particles

• is method of synthesis of polymers

• is a bottom-up approach of synthesis of nano particles

• is method of synthesis of piezoelectric materials

Factor affecting synthesis of nanoparticles,

• all of these
• Particle Size and Shape

• Pressure

• Temperature and Time

Applications of Sol Gel Technique,

• all of these
• used for forming coatings on window glass

• in making ultraviolet protection gels

• used for producing lubricants and scratch free paints

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,

• Cellulose

• DNA

• Neoprene

• Isoprene

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

• Urea-formaldehyde.

• Nylon 6,6.

• Kevlar.

• Bakelite.

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.