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12 questions
Cellulose is made up of large number of _______ units.
sucrose
glucose
amino acids
dacron
Mention the type of polymer.
linear
natural
cross linked
synthetic
The synthetic fibre best suited to make this is ______ and is due to its _____property.
Polyester, Elasticity
Nylon,Elasticity
Polyester, High tensile strength
Nylon, High tensile strength
Which of the following plastics objects can be recycled?
i). Electric socket ii). Polythene bag iii).PVC pipe iv). Ashtray
A and B
B and C
A and D
C and D
Out of the following materials ::
a. Which materials are polyesters? b. Which material is a polyamide?
cotton, nylon
terylene, wool
cotton,wool
terylene, nylon
It is not advisable to wear clothes made of synthetic fibre while working near fire because
.
They are uncomfortable in those works
They melt on heating and cause heavy burns
They do not absorb moisture
They are shiny and lustrous
Thermosetting Plastics
Can be reshaped using heat and pressure.
Are lighter plastics
Can be recycled
Can not be reshaped using heat and pressure
Necklace : bead :: polymer : ________.
Monomer
Dimer
Tetramer
Trimer
Why do we make umbrella with synthetic fiber?
Identify the non biodegradable items from the following
Tooth brush
Frying pan handle
vegetable peel
cotton bag
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