Correct Answer:- Option-C
Question70:-Which one is the natural polyamide polymer?
A:-Cotton
B:-Silk
C:-Nylon-6
D:-Jute
Correct Answer:- Option-B

Question71:-A continuous and aligned glass fiber-reinforced composite consists of
30 vol% glass fibers having a modulus of elasticity of 69 GPa and 70 vol% polyester
resin that, when hardened, displays a modulus of 3.4 GPa. The modulus of elasticity
of this composite in the longitudinal direction is

A:-23.1 GPa
B:-65.6 GPa
C:-42.76 GPa
D:-72.4 GPa
Correct Answer:- Option-A
Question72:-Dry spinning is a process
A:-Which is used for polymers that can be melted easily

B:-Which involves dissolving polymer in a solvent and the solution is extruded
into a chemical bath

C:-Which involves dissolving the polymer into a solvent that can be
evaporated

D:-Which is used only for network polymers
Correct Answer:- Option-C
Question73:-Which of the following statements about plasticizers is true?

A:-Plasticizers increase the modulus while decreasing the glass transition
temperature

B:-Plasticizers decrease the modulus while increasing the glass transition
temperature

C:-Plasticizers are added to increase the intermolecular forces between the
chains

D:-Plasticizers are high boiling organic esters
Correct Answer:- Option-A

Question74:-For 1 inch schedule 40 PVC pipe and 1 inch schedule 80 PVC pipe
which of the following statement is correct?

A:-Schedule 80 PVC pipe has a larger outside diameter than schedule 40 pipe
B:-Schedule 40 PVC pipe has a larger outside diameter than schedule 80 pipe
C:-Schedule 80 PVC pipe has a smaller inside diameter than schedule 40 pipe

D:-Schedule 40 PVC pipe has a smaller inside diameter than schedule 80 pipe