1.What is the other name for artificial silk?
(a) Nylon
(b) Rayon
(c) Acrylic
(d) Polyester
2.Which fibre is used as artificial wool?
(a) Acrylic
(b) Rayon
(c) Nylon
(d) Cotton
3.Polymers are made up of small units called
(a) layers
(b) molecules
(c) cells
(d) monomers
4.The strongest synthetic fibre is
(a) nylon
(b) rayon
(c) polyester
(d) acrylic
5.Wood pulp is used to make
(a) plastic
(b) wool
(c) jute
(d) rayon
6.Which of the following is a natural fibre?
(a) Wool
(b) Nylon
(c) PVC
(d) Polythene
7.Melamine is
(a) thermoplastic polymer
(b) thermosetting polymer
(c) fibre
(d) elastomer
8.Fibre produced in factories is called
(a) man-made fibre
(b) natural fibre
(c) synthetic fibre
(d) both (a) and (c)
9.PET is a
(a) polyester
(b) polyamide
(c) nylon
(d) thermosetting polymer
10.Which of the following cannot be recycled?
(a) Toys
(b) Cooker handles
(c) Carry bags
(d) Plastic chair
11.The plastic which cannot be recycled is
(a) jute
(b) rayon
(c) petrochemicals
(d) bakelite
12.Bakelite is an example of
(a) fibre
(b) elastomer
(c) nylon
(d) thermosetting polymer
13.Which term is used for polymers made up of a large number of glucose units?
(a) Protein
(b) Fructose
(c) Cellulose
(d) Polyester
14.Which of the following is non-biodegradable?
(a) Paper
(b) Cotton cloth
(c) Wood
(d) Plastic
15.Which of the following is natural fibre obtained from plants?
(a) Cotton
(b) Wool
(c) Rayon
(d) Ketone
1. Plastics are non-reactive. Is using plastics for storing food safe?
2. Write any two uses and properties of the following:
a. Nylon
b. Polyester
c. Acrylic
3. What is PET?
4. Write any four important properties of plastics.
5.A lady went to the market to buy a blanket. The shopkeeper showed her blankets made of acrylic fibres as well as made of wool. She preferred to buy an acrylic blanket. Explain.
6. why the following are made of thermosetting plastics.
(a) Saucepan handles
(b) Electric plugs/switches/plug boards Give examples which indicate that nylon fibres are very strong.
7. Explain the difference between thermoplastic and thermosetting plastics.
8.Rana wants to buy shirts for summer. Should he buy cotton shirts or shirts made from synthetic material? Advise Rana, giving your reason.
Answers
Answer:
Explanation:
Q1
ANS- RAYON
Q2
ANS- ACRYLIC
Q3
ANS- MONOMERS
Q4
ANS- NYLON
Q5
ANS-JUTE
Q6
ANS- WOOL
Q7
ANS- THERMOSETTING POLYMER
Q8
ANS- BOTH (A) AND (C)
Q9
ANS- POLYESTER
Q10
ANS- COOKER HANDLES
Q11
ANS- BAKELITE
Q12
ANS-THERMOSETTING PLASTIC
Q13
ANS- CELLULOSE
Q14
ANS- PLASTIC
Q15
ANS- COTTON
Q16
ANS- YES, PLASTICS CAN BE USED FOR STORING FOOD AS THE ARE NON- REACTIVE AND WILL NOT ACT AS A POISION IN FOOD, THE ARE EASILY AVAILAIBLE.
Q17
ANS- DO IT YOURSELF
Q18
ANS- PET, stands for polyethylene terephthalate. It is a form of polyester.
Q19
ANS- Properties of plastics:-
1)PLASTICS ARE chemically NON REACTIVE, Plastics do not react with air and water
2)They do not conduct heat or electricity, so they be used as insulators
3)Plastics can be moulded into different shapes
4)Plastics are quite cheaper and easily made.
Q20
ANS- THE LADY BOUGHT ACRYLIC BLANKETS BECAUSE THEY ARE CHEAP, LIGHTER, MORE DURABLE AND EASILY AVAILABE IN VARIETY OF COLOURS AND DESIGNS.
Q21
ANS- a) Thermosetting plastics are used in saucepan handles because they do not soften on heating and also they cannot be bent easily. These plastics like bakelite are poor conductors of heat.
b) Thermosetting plastics are used in electric plugs/switches/plug boards as they are bad conductors of electricity. They do not get moulded. Also,they are hard and strong.
Q-22
ANS- HE SHOULD BY COTTON SHIRTS AS COTTON ABSORBS HEAT AND AND MAKES OUR BODY COOLER AND THUS MAKES US FEEL COMFORTABLE.
PLEASE MARK ME AS A BRAINLIEST
Answer:
1.rayon
2.rayon
3.monomers
4.nylon
5.jute
6.wool
7.thermosetting polymer
8.syntetic fibre
9.thermoplastic polymer
10.cooker handles
11.bakelite
12.thermosetting polymer
13.cellulose
14.paper
15.cotton