Rubber

Q. What is the monomeric unit of natural rubber?

1. Buna-N
2. Buna-S
3. Isoprene
4. Neoprene

Q. Which one is not the property of rubber?

1. It repels water
2. It resists oxidation
3. It resists attack by acids
4. High tear and tensile strength.

Q.

Natural rubber is a polymer of:

Q.

The advantage of acrylic over other fabrics is that it _____.

1. is water proof, good conductor of electricty and has great elasticity

2. has resistance to shrinkage, sunlight and great elasticity

3. has good elasticity and is a good conductor of electricity

4. has excellent resistance to sunlight and is water proof

Q.

Ram has a cotton shirt and a shirt made from synthetic material. Which shirt is suitable for summers? Explain. [3 MARKS]

Q. Melamine is a _________.

1. thermosetting plastic
2. natural fibre
3. polyester
4. thermoplastics

Q. Melamine is a _________.

1. thermoplastics
2. polyester
3. natural fibre
4. thermosetting plastic

Q. Melamine is a _________.

1. thermosetting plastic
2. polyester
3. natural fibre
4. thermoplastics

Q. Thermosetting plastics are strong, durable, and can be remoulded when heated.

1. True
2. False

Q. Melamine is a _________.

1. polyester
2. natural fibre
3. thermoplastics
4. thermosetting plastic

Q. Melamine is a _________.

1. natural fibre
2. thermosetting plastic
3. thermoplastics
4. polyester