7th Standard CBSE Syllabus & Materials
7th Standard CBSE
CBSE 7th Social Science Theme E - Understanding Market - New Sample Question Papers Study Material - QB365 Set A
NEW7th Standard CBSE
CBSE 7th Social Science Theme E - From Barter to Money - New Sample Question Papers Study Material - QB365 Set A
NEW7th Standard CBSE
CBSE 7th Social Science Theme D - The Constitution of India- An Introduction - New Sample Question Papers Study Material - QB365 Set A
NEW7th Standard CBSE
CBSE 7th Social Science Theme D - From the Rulers to the Ruled : Types of Governments - New Sample Question Papers Study Material - QB365 Set A
NEW7th Standard CBSE
CBSE 7th Social Science Theme B - The Age of Reorganisation - New Sample Question Papers Study Material - QB365 Set A
NEW7th Standard CBSE
CBSE 7th Social Science Theme B - The Rise of Empires - New Sample Question Papers Study Material - QB365 Set A

Published on: 31/10/2025
Download CBSE Class 7th Standard CBSE Science question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 7th Standard CBSE Science
Questions + Answers key
Take MCQ Science Test

1.
Which one is animal fibre?
Cotton
Silk
Polyester
Jute
2.
Which one of the following is not a variety of silk?
Nali
Tassar
Mooga
Drganza
3.
Silk is a :
Staple fibre
Rough fibre
Filament fibre
Textured fibre
4.
Silkworms secrete fibre made of
fat
cellulose
protein
nylon
5.
The silkworm is (i) a caterpillar, (ii) a larva.
(i)
(ii)
Both (i) and (ii)
Neither (i) nor (ii)
6.
What are the advantages of synthetic fibres over natural fibres?
7.
Given below is a sequence of steps in the processing of wool. Which are the missing step? Add them.
Shearing, .... sorting ......, ......,......
8.
Why are silk fibres called animals fibres?
9.
In which part of India, yak wool is common?
10.
Name some wool yielding animals
11.
Name the sources of obtaining fibres.
12.
Rohan's uncle works as a technical advisor in a renowned fabric company of our country. Rohan came to know that different kinds of fibres are the raw materials for fabric industry and put forward the following questions to his uncle when he came home.
Answer the following questions based on the situation described above.
(i) What can we obtain the fibres like wool, cotton, silk?
(ii) What are the different steps by which woollen fibres are converted into the yarn?
(iii) What is the use of yarn?
(iv) Name the animals from which we obtain different quality of wools other than sheep.
(v) How can the special characters like softness in the woollen fibre be obtained?
(vi) What values are displayed by Rohan?
13.
Ajay's father works in a wool industry. In his line of work, he does the job of sorting the fleece of sheep into fibres of different qualities. Ajay noticed that his father and other workers who were doing the similar kind of jobs faced a number of health problems. Ajay discussed this problem with his friends and he came to know that his father is getting health problems due to the nature of his work. Ajay is worried about his father's health. He advised his father to take care of their health and told him about the occupational hazards.
Now answer the following questions.
(a) What do you mean by occupational hazard?
(b) Name the disease that workers may at risk.
(c) What values are shown by Ajay?
14.
Rearing of silk worms to obtain the ______ is called________ .
15.
The thick coat of ________ on sheep create an insulating barrier.
16.
The sleeping period of silkworm is _____ hours at intervals of about six days.
17.
Wool dissolves in ____ and _______
18.
Lohi and nali are breeds of ______
19.
Yak hair are not used to make woollen fabric.
20.
In the process of obtained wool from fleece, sorting is done after scouring.
21.
Mooga is the strongest variety of wool.
22.
Silkworm feeds on oak leaves.
23.
Sericulture
24.
Anthrax
25.
Mulberry leaves
26.
Washing of hair removed from sheep
27.
Kashmiri goat
28.
Where is Yak wool common in india?
29.
What is Cocoon?
1.
(b)
Silk
2.
(a)
Nali
3.
(c)
Filament fibre
4.
(c)
protein
5.
(c)
Both (i) and (ii)
6.
Advantages of synthetic fibres are that they are cheap, easily available, not attacked by insects, easy to store and dries up quickly.
7.
(i) Shearing
(ii) Scouring,
(iii) Sorting
(iv) Fibre spinning,
(v) Dyeing
(vi) Rolling intp the yarn
8.
Silk fibres are derived from silkworms and are therefore called animal fibres. The scientific name for the silk producing moth (species) is Bambyx mari. It is one of the most beautiful moth.
9.
Yak wool is common in the hilly regions of Ladakh.
10.
Wool yielding animals are sheep, yak, llama, alpaca, angora goat, angora rabbit and camel.
11.
The sources of obtaining fibres are plants and animals.
12.
(i) We obtain wool from the fleece (hair) of sheep, cotton from cotton plant and silk from cocoons of siIk moth.
(ii) Step I - Shearing, Step II - Scouring, Step III - Sorting, Step IV - Fluffy fibres called burrs are picked out from hair, Step V- Dyeing of fibres, Step VI- Fibres are straightened, combed and rolled into yarn.
(iii) Yarns are used to knit sweaters.
(iv) Yak, Alpace, Llama, Angora goat, camel.
(v)By 'selective breeding' we can obtain the special characters is the woollen fibre.
(vi)Awareness regarding those animals who are used by human being for different types of clothing.
13.
(a) The risks faced by people working in any industry due to the nature of their work are called occupational hazards.
(b) The people who do the job of sorting, sometimes, get infected by the bacteria called anthrax which cause a deadly blood disease called sorter's disease.
(c) Ajay is very caring, intelligent and sensible boy.
14.
( )
silk, sericulture
15.
( )
hair
16.
( )
24
17.
( )
acids and bases
18.
( )
sheep
19.
(b)
20.
(a)
21.
(b)
22.
(b)
23.
( )
Rearing of silkworm to get silk
24.
( )
Sorter's disease
25.
( )
Silkworms
26.
( )
Scouring
27.
( )
Pashmina
28.
( )
Ladakh.
29.
( )
The covering of silk fibres inside which the caterpillar covers itself is called cocoon.
7th Standard CBSE Syllabus & Materials
7th Standard CBSE
CBSE 7th Social Science Theme B - New Beginnings : Cities and States - New Sample Question Papers Study Material - QB365 Set A
NEW7th Standard CBSE
CBSE 7th Social Science Theme A - Climates of India - New Sample Question Papers Study Material - QB365 Set A
NEW7th Standard CBSE
CBSE 7th Social Science Theme A - Geographical Diversity of India - New Sample Question Papers Study Material - QB365 Set A
NEW7th Standard CBSE
CBSE 7th Science Earth, Moon and the Sun - New Sample Question Papers Study Material - QB365 Set A
NCERT Books
Syllabus
Exam Pattern
Sample Question Papers
Previous year Question Papers
Important Notes
MCQ Practice test
NCERT Exemplers
Case study Questions
Image Based Questions
Passage based Questions
HOT Questions
Value Based Questions
Model Questions Papers
NCERT ( Book Back ) Questions
Assertion and Reason
Important Questions And Answers
CBSE 7th Standard CBSE Subjects
CBSE Standards