CBSE Class 8 Science Worksheet
Synthetic Fibres and Plastics
1.
State True or False: Flax is a synthetic fiber.
A)
true
B)
false
2.
Write the name of raw materials used for making nylon.
3.
Choose the correct answer: The polymer which is used in making non stick cookware is ____________.
A)
Teflon
B)
Polythene
C)
Melamine
D)
Bakelite
4.
State True or False: Thermoplastics are hard and brittle.
A)
true
B)
false
5.
Choose the correct answer: The purest natural form of cellulose is __________.
A)
Wool
B)
cotton
C)
Silk
D)
Acrylic
6.
Choose the correct answer: Natural polymer occurring in plant is __________.
A)
cellulose
B)
starch
C)
Both 1 and 2
D)
silk
7.
Choose the correct answer: The polymer which is coated on the uniforms of the firemen to make them fire resistant is ___________.
A)
Teflon
B)
PVC
C)
Melamine
D)
Bakelite
8.
Choose the correct answer: First synthetic fiber formed from natural material is ___________.
A)
Terycot
B)
Rayon
C)
Acrylic
D)
Nylon
9.
State True or False: Cotton is a natural polymer.
A)
true
B)
false
10.
Fill in the blanks: Fibers consisting of many small repeating units are known as ______________.
11.
Which of the following is thermoplastic ?
A)
Bakelite
B)
Melamine
C)
PVC
D)
Teflon
13.
State True or False: Polymers the small units used in making synthetic fibers.
A)
true
B)
false
14.
Which of the following is thermosetting plastic?
A)
PVC
B)
Polythene
C)
Melamine
D)
None of these
15.
Why one should not wear synthetic fibers while working with fire?
16.
Choose the correct answer: The material similar to silk in appearance is _________.
A)
Nylon
B)
Rayon
C)
Terylene
D)
Polyester
17.
Fill in the blanks: Polycot is obtained by mixing ____________ and _____________.
18.
Choose the correct answer: The polymer which is commonly used as packaging material is _________.
A)
PVC
B)
Bakelite
C)
Melamine
D)
Polythene
19.
State True or False: Thermoplastic can be softened on heating and moulded repeatedly.
A)
true
B)
false
20.
Choose the correct answer: The polymer which for making bottles and jars is __________.
A)
PET
B)
PVC
C)
Polythene
D)
Bakelite
CBSE Class 8 Science Worksheet
Synthetic Fibres and Plastics
Answers
1.
Option B
2.
Coal, water and air
3.
Option A
4.
Option B
5.
Option B
6.
Option C
7.
Option C
8.
Option B
9.
Option A
10.
monomers
11.
Option C
12.
Polyethylene Terephthalate
13.
Option A
14.
Option C
15.
Because they melt on heating and stick to body when they catch fire.
16.
Option D
17.
polyester and cotton
18.
Option D
19.
Option A
20.
Option A
