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Question-1
Silk is obtained from ____________ of the silk moth.

(A) Pupa	(B) Larva
(C) Cocoon	(D) Caterpillar

Question-2
Wool is obtained from _______ of sheep.

(A) Skin	(B) Toes
(C) Fleece	(D) All of the above

Question-3
Which of the following are thermoplastics ?
I. Poly-vinyl chloride
II. Poly- styrene
III. Polythene
IV. Bakelite

(A) I and II only	(B) II and III only
(C) I, II and III only	(D) I, II and IV only

Question-4
Select the material that is used to make ropes for use in rock climbing.

(A) Nylon-6	(B) Nylon-66
(C) Rayon	(D) Acrylic

Question-5
Commonly used synthetic fabrics are
I. Rayon
II. Nylon
III. Polyester
IV. Acrylic

(A) I and II only	(B) II and III only
(C) I, II and III only	(D) All of these

Question-6
The sorter's disease is caused by a bacteria:

(A) Anthrax	(B) Bacillus
(C) Virus	(D) Aedes

Question-7
Which of the following are correct about acrylic?
I. It is synthetic fibre that resembles wool.
II. It is also called lycra.
III.It is also known as orlon
IV.It is used in making T-shirts and caps.

(A) I and II only	(B) I and III only
(C) II and III only	(D) II and IV only

Question-8
Which of the following is true for plastics ?

(A) Like synthetic fibres, plastics are also polymers.	(B) Thermo-plastics are harder and stronger than thermosetting plastics.
(C) Bakelite is a thermoplastic.	(D) None of the above

Question-9
To which of the following 4R principle apply most?

(A) Synthetic fibre	(B) Natural fibre
(C) Metals	(D) Plastic

Question-10
Since plastics are not generally attacked by chemicals, so they are ideal substitutes for

(A) wood	(B) Metals
(C) Glass	(D) All of these

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Std 8

CBSE

Practice in Related Chapters
Combustion,flame and fuel
Coal and Petroleum
Synthetic Fibres and Plastics
Pollution of Air and Water
Metals and Non-Metals

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