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Nylon is made when the appropriate monomers (the chemical building blocks which make up polymers) are combined to form a long chain via a condensation polymerisation reaction. The monomers for nylon 6-6 are adipic acid and hexamethylene diamine. Nylon fibers are exceptionally strong and elastic and stronger than polyester fibers. The fibers have excellent toughness, abrasion resistance, and are easy to wash, and to dye in a wide range of colors. The filament yarns provide a smooth, soft, and lightweight fabric of high resilience.

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Keywords of force and pressure

Posted by Darshita Kaur 6 years, 5 months ago

CBSE > Class 08 > Science

1 answers

Pratheek Halvi 6 years, 5 months ago

Keywords of pressure are exerted by the attached air/liquid , Atmospheric pressure

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Key word of force

Posted by Darshita Kaur 6 years, 5 months ago

CBSE > Class 08 > Science

1 answers

Srishti Maheshwary 6 years, 5 months ago

A push or pull on an object is called force

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How mant degree is required for boiling

Posted by T S 6 years, 5 months ago

CBSE > Class 08 > Science

3 answers

Sia ? 6 years, 5 months ago

100 degrees

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Abnish Kumar 6 years, 5 months ago

100 degrees Celsius

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Aryan Raj 6 years, 5 months ago

100 degree Celsius.

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what do you mean by fastrack

Posted by Amrit Raj 6 years, 5 months ago

CBSE > Class 08 > Science

1 answers

Shermila Florence 6 years, 5 months ago

A sports company

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What do you mean respiration

Posted by Navneet Kaur 6 years, 5 months ago

CBSE > Class 08 > Science

2 answers

Yatharth Prasad 6 years, 5 months ago

Inhaling and exhaling

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Shermila Florence 6 years, 5 months ago

Inhaling and exhaling

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What is force,pull or push

Posted by Navneet Kaur 6 years, 5 months ago

CBSE > Class 08 > Science

1 answers

Amrit Raj 6 years, 5 months ago

push or pull interact between two bodies is called force

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what is food preservation? how we preserve the dried food?

Posted by Amrit Raj 6 years, 5 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 6 years, 4 months ago

Techniques to prolong the shelf life of a food are called food preservation. We know that microbes proliferate very fast in presence of food, moisture, oxygen and ambient temperature. All the methods of food preservation are aimed at ruling out the food, moisture, oxygen and ambient temperature for microbes so that they won’t proliferate. Some common methods of food preservation are as follows:

Sun Drying: This is a traditional method of food preservation. Sun-drying helps in removing moisture from food. Grains are dried in sun before being stored. Many vegetables are also sun-dried so that they can be used in off season.

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Write an activity to show that nylon fibre is stronger than other fibre

Posted by Kashish Choudhary 6 years, 5 months ago

CBSE > Class 08 > Science

0 answers

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Why synthetic fibre are not wear in kitchen

Posted by Kashish Choudhary 6 years, 5 months ago

CBSE > Class 08 > Science

1 answers

Sia ? 6 years, 5 months ago

Synthetic fibres melt very soon on heating. If the clothes catch fire, it can be disastrous. The fabrics melt and stick to the body of a person wearing it. We should therefore not wear synthetic clothes while working in the kitchen.

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True or false 1) Oxygen in air is an exhaustible natural resources. 2) Cells of root modules of leguminous plants fise nitrogen. 3)Resources which are present in unlimited quantities in nature are

Posted by Durga Yadav 6 years, 5 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 6 years, 5 months ago

1) Oxygen in air is an exhaustible natural resources. False
2) Cells of root modules of leguminous plants fise nitrogen. True, Because of rhizobium
3)Resources which are present in unlimited quantities in nature are called exhaustible natural resources. False

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What is mean by antibiotic

Posted by Bad Boy Naik 6 years, 5 months ago

CBSE > Class 08 > Science

6 answers

Sia ? 6 years, 5 months ago

Antibiotic is a medicine that inhibits the growth of or destroys microorganisms.

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Lalit Lalit 6 years, 5 months ago

The medicines which kill or stop the growth of microorganisms in our body are called antibiotics

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Yatharth Prasad 6 years, 5 months ago

Thank-you

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Yatharth Prasad 6 years, 5 months ago

Antibiotics is a medicine in fighting with microorganisms

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Ꭾꮢꮛꮛꮦ Ꭾꭷꮢꮗꮧꮭ 6 years, 5 months ago

a medicine which can stop the growth of undesirable microorganisms in our body or which kill the unwanted microorganisms in our body is called antibiotics .antibiotic must be taken as described as doctor or as instruction dosage while taking lesser amount of antibiotic can result in regeneration of undesirable microorganisms while taking extra dosage of antibiotics kill the beneficial bacteria also.

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Amrit Raj 6 years, 5 months ago

antibiotic are chemical that kills or inhibit the growth of other harmful microorganisms

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Give 10 antibodies invented by

Posted by Shivanand Sonawane 6 years, 5 months ago

CBSE > Class 08 > Science

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What are the different methods of food preservation

Posted by Tanuja Choudhary 6 years, 5 months ago

CBSE > Class 08 > Science

1 answers

Sia ? 6 years, 5 months ago

Important methods used for preserving food are :
Chemical Method : Salts and edible are the common chemicals generally used to check the growth of microorganisms. Therefore they are called preservations. We add salt or acid preservatives to pickles to prevent the attack of microbes. Sodium benzoate and sodium metabisulphite are common preservatives. These are also used in the jams and squashes to check their spoilage.
Preservation by Salt : Common salt has been used to preserve meat and fish ages. Meat and fish are covered with dry salt to check the growth of bacteria. Salting is also used to preserve amla, raw mangoes, tamarind etc.
Preservation by sugar : Jams, jellies and squashes are preserved by sugar. Sugar reduces the moisture content which inhibits the growth of food spoiling bacteria.
Preservation by Oil and Vinegar : Use of oil and vinegar prevents spoilage of pickles because bacteria cannot live in such an environment. Vegetables, fruits, fish and meat are often preserved by this method.

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Name two exotic species

Posted by Aadarsh Mishra 6 years, 5 months ago

CBSE > Class 08 > Science

1 answers

Sia ? 6 years, 5 months ago

European gypsy moth and honeysuckle

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What are thermosetting plastics

Posted by Latha Manju 6 years, 5 months ago

CBSE > Class 08 > Science

4 answers

Lalit Lalit 6 years, 5 months ago

Plastics which when moulded once, can not be softened by heating are called thermosetting plastics. ex-Bakelite and melamine.

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Yatharth Prasad 6 years, 5 months ago

Thermoseting plastic is a used by making tubelight

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Prince Senapati 6 years, 5 months ago

The plastic which cannot be moulded again and cannot be bent. If we will try to bend it harder than it will brake.

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Daksh Sharma 6 years, 5 months ago

check in your science book or in dictionary..

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why copper gain a greenish layer? Please help..

Posted by Daksh Sharma 6 years, 5 months ago

CBSE > Class 08 > Science

1 answers

Sia ? 6 years, 5 months ago

Copper is not affected by dry air at ordinary temperature. On exposure to moist air, it gets covered with a beautiful green coating of either basic carbonate or basic sulphate.
2Cu + H₂O + CO₂ + O₂ → CuCO₃.Cu(OH)₂
8Cu + 6H₂+2SO₂ + 5O₂→ 2[CuSO₄.3Cu(OH)₂]
Copper present in bronze or in utensils is corroded by moist air containing acidic oxides like carbon dioxide, sulphur dioxide etc. The greenish layer formed is of basic copper carbonate or basic copper sulphate. This phenomenon is called ‘corrosion of metals’

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Do mensuration occur in animals (female) ?

Posted by Balaji Pandre 6 years, 5 months ago

CBSE > Class 08 > Science

1 answers

Sia ? 6 years, 5 months ago

<nav id="nav-single">All mammals have a menstrual cycle. But most of them have a covert menstruation. This means the endometrial lining is so thin; it gets completely absorbed by the body if the egg isn’t fertilised.</nav>

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Lesson 2 exercise

Posted by Priya Dharshnii 6 years, 5 months ago

CBSE > Class 08 > Science