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- 1. Multiple Choice
Select the correct option regarding the given Assertion and Reasoning:
Assertion (A): Rayon is a synthetic fibre
Reason (R): It is obtained from coal, water and grass
Both A and R are true and R is the correct explanation of A
Both A and R are true but R is not the correct explanation of A
A is false and R is true
Both A and R are false
- 2. Multiple Choice
Select True or False:
An advantage of natural fibres over synthetic fibres is that natural fibres are more durable.
True
False
- 3. Multiple Choice
Which natural fibre does acrylic resemble?
Wool
Silk
Cotton
None
- 4. Multiple Choice
What is the main source of plastics?
Crude oil
Polyester
Thermoplastics
Plastosources
- 5. Multiple Choice
Pick all the problems with plastics.
Careless disposal of them chokes drains, chokes the soil and hinders the absorption of water by the soil.
Careful disposal of them chokes drains, chokes the soil and hinders the absorption of water by the soil.
Plastic bags can contaminate foodstuffs because of poisonous dyes getting absorbed into food.
If burnt, they release poisonous fumes like hydrogen chloride (HCl) and hydrogen cyanide (HCN) and pollute the air.
- 6. Multiple Choice
Which of the following synthetic fibres are used to as a substitute of glass?
Perspex
Teflon
PET
Polystyrene
- 7. Multiple Choice
____ synthetic fibre absorbs moisture.
Polyester
Rayon
Lycra
Spandex
- 8. Multiple Choice
The most commonly used polyester is
Terylene
PET
Nylon
Rayon
- 9. Multiple Choice
____ synthetic fibre has excellent elasticity
Spandex
Lycra
Acrylic
Nylon
- 10. Multiple Choice
Polyvinyl Chloride (PVC) is a ____ plastic.
Thermo
Thermosetting
conducting
soft
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