Science - Synthetic Fibres and Plastics
Exam Duration: 45 Mins Total Questions : 30
From which part of sheep is wool made from?
- (a)
Skin
- (b)
Toes
- (c)
Fleece
- (d)
All of the above
What is the process of taking out silk threads from the-cocoon known as?
- (a)
Rearing
- (b)
Sorting
- (c)
Scouring
- (d)
Reeling
What do silk fibres consist of?
- (a)
Vitamins
- (b)
Carbohydrates
- (c)
Proteins
- (d)
Fats
Why is nylon useful?
- (a)
It is soft, strong and light.
- (b)
It is transparent, light and easy to wash
- (c)
It is strong, elastic and light.
- (d)
It is soft, inexpensive and strong.
Fruits have characteristic smells. Which of these chemicals is responsible for it?
- (a)
Yeas
- (b)
Alcohol
- (c)
Cellulose
- (d)
Esters
Which of the following articles is made by using only man-made substances?
- (a)
- (b)
- (c)
- (d)
Which of the following is made from coconut fibre?
- (a)
Sweaters
- (b)
Shoes
- (c)
Mattresses
- (d)
Sarees
Which of the following statements is NOT true?
- (a)
Polymers occur in nature.
- (b)
Nylon is used in the making of parachutes.
- (c)
Cellulose is made up of glucose units.
- (d)
Nylon thread is weaker than cotton thread
PVC is an example of
- (a)
plastic.
- (b)
thermoplastic
- (c)
thermosetting plastic.
- (d)
acrylic
Which of the given materials is used to prepare synthetic fibres like polyester and acrylic?
- (a)
Wood pulp
- (b)
Coconut fibres
- (c)
Petrochemicals
- (d)
Paper pulp
Match the entries in Column I with those in Column II.
- (a)
a-l,b-3,c-4,d-2
- (b)
a-2,b-4,c-3,d-l
- (c)
a-3,b-l,c-4,d-2
- (d)
a-4,b-l,c-2,d-3
Which of the following is nonbiodegradable?
- (a)
Plastic
- (b)
Cotton
- (c)
Paper
- (d)
Left-over food
By which of these processes is polythene produced?
- (a)
Isomerization
- (b)
Polymerisation
- (c)
Hydrogenation
- (d)
All of the above
Which of the following plastic products can be remoulded?
- (a)
Bakelite
- (b)
Melamine
- (c)
Polythene
- (d)
Polycot
Which of the following products cannot be decomposed easily?
- (a)
Acrylic
- (b)
Polythene
- (c)
Plastic
- (d)
All the above
Why is plastic coated with melamine?
- (a)
It becomes a good conductor of heat.
- (b)
It becomes strong and flexible.
- (c)
It becomes a fire proof plastic.
- (d)
It is remouldable
Which of the following is used for making terylene fibres?
- (a)
Wood pulp
- (b)
Esters
- (c)
Acrylic
- (d)
Paper pulp
To which of the following does the 4R principle apply the most?
- (a)
Synthetic fibre
- (b)
Natural fibre
- (c)
Metal
- (d)
Plastic
Which of the following statements is NOT true?
- (a)
Thermosetting plastics are bad conductors of heat and electricity.
- (b)
Thermoplastics are good conductors of heat and electricity
- (c)
Plastics do not get corroded easily.
- (d)
Plastic is also a polymer.
Which of the following is a property of thermosetting plastic?
- (a)
Flame resistant
- (b)
Non-corrosive
- (c)
Mouldable
- (d)
All of the above
Which of the following fabrics is made by mixing two types of fibres?
- (a)
Cotton
- (b)
Polywool
- (c)
Rayon
- (d)
Nylon
Which of the following is purely a synthetic fibre?
- (a)
Rayon
- (b)
Nylon
- (c)
Cotton
- (d)
Flax
Which of the following differences regarding thermoplastics and thermosetts is/are true?
- (a)
Only (i)
- (b)
Only (i) and (ii)
- (c)
Only (i) and (iii)
- (d)
(i), (ii) and (iii)
Which of the following properties of nylon are most convenient for its use?
- (a)
It is soft, strong and heavy.
- (b)
It is strong, elastic and light.
- (c)
It is soft, inexpensive and strong.
- (d)
It is expensive, soft and light.
Which of the following is an example of a heavily cross linked polymer?
- (a)
Melamine
- (b)
Polythene
- (c)
Nylon
- (d)
Polyester
How does the burning of synthetic polymers such as plastic pollute the environment?
- (a)
By releasing smoke and toxic gases
- (b)
By releasing water vapour and haze
- (c)
By releasing water vapour and smoke
- (d)
By forming smog and rain
Which of the following is a property of thermoplastics?
- (a)
They do not bend.
- (b)
They do not get deformed easily.
- (c)
They are resistant to most of the chemicals.
- (d)
They are made up of long polymer chains with strong bonds.
Which of these clothes should you wear while cooking in the kitchen?
- (a)
Rayon
- (b)
Cotton
- (c)
Polyester
- (d)
Polycot
By what name is artificial (man-made) wool known as?
- (a)
Rayon
- (b)
Acrylic
- (c)
Polycot
- (d)
Polyester
What is the best method to avoid pollution by using plastic bags?
- (a)
Burying the plastic bags in the soil.
- (b)
Using bags made of biodegradable material.
- (c)
Throwing the plastic bags into the river
- (d)
Burning the plastic bags in a rubbish dump.