Class 7 Science Chapter 3 MCQ for 2020-21
| Class: | 7 |
| Subject: | Science |
| Contents: | Multiple Choice Questions – MCQ Tests |
Class 7 Science Chapter 3 MCQ Tests
Class 7 Science Chapter 3 MCQ tests with answers and explanation are given below. It provides the complete revision for 7th Science Chapter 3. Every time starts a new test, when you click the button Start a New Test. After attempting 3 or 4 tests out of these 20 tests, you will feel confident about this chapter. It will also help in solving doubts related to Chapter 3 of grade 7 Science.
Q1
Certain breeds of sheep have thick coat of hair which is famous for
[A]. Good quality of wool
[B]. Coarse quality of wool
[C]. Hosiery articles covering
[D]. Milk giving animals
Answer: Option A
Explanation:For obtaining wool, sheep are reared. Their hair is cut and processed into wool. The quality and texture of the fibres obtained from them. Certain breeds of sheep have thick coat of hair on their body which yields good quality wool in large quantities.
Q2
Paheli wants to know the name of the breed which is famous for good quality of wool?
[A]. Lohi
[B]. Marwari
[C]. Nali
[D]. Patanwadi
Answer: Option A
Explanation:There are some famous breeds of sheep which found in India. Such as, Lohi is famous for “Good quality of wool”. Marwadi is famous for “Coarse wool”. Nali is famous for “Carpet wool” and pathanwadi is famous for “Hosiery”.
Q3
Paheli wants to know the name of wool producing countries in the world? Would you help her?
[A]. Uruguay
[B]. China
[C]. Argentina
[D]. All the above.
Answer: Option D
Explanation:The best wool producing countries are Australia, New Zealand, South Africa, China and Argentina. Australia is the world’s largest producer of wool and contributes 25% of total world supply.
Q4
What do you mean by “Raw silk”?
[A]. When the cocoons are kept under the sun or boiled or exposed to steam condition.
[B]. When caterpillar just completed cover (itself) by protein fibres.
[C]. When cocoons are dyed in beautiful colours after boiling process.
[D]. None of the above.
Answer: Option D
Explanation:After brushing, filaments from four to eight cocoons are joined and twisted. About 48 such twisted filament are joined to make a thread that is wound on a real. This is called “raw silk”.
Q5
Read the following statements carefully and choose the incorrect sentence(s)?
[A]. Can we say that cotton fibre is form of carbohydrate.
[B]. Can we say that silk fibre is a form of protein.
[C]. Can we say that jute fibre is a form of fat.
[D]. Can we say that wool fibre is a form of protein.
Answer: Option C
Explanation:Among the natural fibres, jute ranks next to cotton in terms of production. Jute is a cellulosic fibre, under the category of bast fibres and its cultivation is almost as old as human civilization. Jute leaves are rich in iron, eating them regularly can help to improve the condition. Jute, an annual herbaceous plant, is mainly cultivated in South and South East Asia.
Q6
Silkworms secrete fibre made of
[A]. Fat
[B]. Cellulose
[C]. Protein
[D]. Nylon
Answer: Option C
Explanation:Silk protein consists of “Sericin” and “Fibroin” mainly. Fat and cellulose are not present in silk. Nylon is a synthetic fibre.
Q7
Paheli and Boojho argued about the different words. Choose which of the statement is or are incorrect?
[A]. Mori-culture is the science of mulberry cultivation.
[B]. Floriculture is the science of the cultivation of flowers.
[C]. Apiculture is the scientific method of rearing of fishes.
[D]. None of the above.
Answer: Option C
Explanation:Apiculture is the scientific method of rearing of honeybees. All the rest are correct. Hence, your answer will be option [C].
Q8
Which of the following is not a type of silk?
[A]. Mulberry Silk
[B]. Tassar Silk
[C]. Mooga Silk
[D]. Moth Silk
Answer: Option D
Explanation:Moth is the silkworm under development inside a cocoon. Mulberry, Tassar and Mooga are varities of silk produced by different rearing practices.
Q9
Boojho wants to know the wool producing states in India, from the given options?
[A]. Jammu and Kashmir
[B]. Himachal Pradesh
[C]. Uttarakhand
[D]. All the above
Answer: Option D
Explanation:The woolen industry in India is small and is located in the states of Jammu and Kashmir, Himachal Pradesh, Arunachal Pradesh, Uttarakhand, Sikkim, Haryana, Punjab, Rajasthan and Gujarat.
Q10
Paheli wants to know that generally in which situation bleaching and dyeing of silk fibres (adding colours) are usually done?
[A]. Before the yarns are made into fibres.
[B]. After the yarns are made.
[C]. Before the fabrics are made.
[D]. After the fabrics are made.
Answer: Option A
Explanation:Generally, bleaching and dyeing of silk fibres (adding colours) are usually done, before the yarns are made into fibres.
What is the name of silkworms?
Silk is also natural animal fibre, obtained from the silkworms named Bombyx Mori.
What is Sericulture?
The practice of rearing silkworms to produce silk is called Sericulture.
What are the common helth problems from which workers suffering in Sericulture industry?
Respiratory disorders, Asthma, scabies, blisters and skin infections are some of the common health problems that workers working in sericulture industry suffer from.
What do you know about Reeling?
The process of collecting of silk thread from cocoons is Reeling.
Uses of Silk
- In the manufacture of clothing, dress materials, curtains and upholstery.
- For handicrafts and items like parachutes, bicycle tyres, comforter filling and artillery gunpowder bags.
- Through a special manufacturing process, it is made suitable for use as nonabsorbable surgical sutures.
- Doctors also use it to make prosthetic arteries.
- As a material to write on.
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