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Yogita Ingle 6 years, 5 months ago
Spinning: The process of making yarn from fibre is called spinning. The raw cotton is supplied to industry in the form of bales.
Posted by Hemlata Gurjar 6 years, 7 months ago
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Meghna Thapar 6 years ago
According to Arrhenius, acid is a substance that dissociates in water to form hydrogen ions or protons. In other words, it increases the number of H+ ions in the water.
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Yogita Ingle 6 years, 7 months ago
A substance is called pure when each particle of the substance has the same unique property. For example; distilled water is pure water as each drop of it contains nothing but water.
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Meghna Thapar 6 years ago
The motion of a spinning top is an example of rotational motion. When an object turns or spins about a fixed axis, it is called rotational motion. A boy moving to and fro on a swing is an example of periodic motion. Periodic motion is the motion which repeats itself after regular intervals of time.
Posted by Urmila Nath 6 years, 7 months ago
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Sia ? 6 years, 7 months ago
Obesity is generally caused by eating too much and moving too little.
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Yogita Ingle 6 years, 6 months ago
The momentum of a system is constant if there is no external force acting on the system. For a collision occurring between two objects in an isolated system, the total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collision.
Posted by Pabitra Behera Behera 6 years, 7 months ago
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Yogita Ingle 6 years, 7 months ago
All living things need energy to do work and for growth and repair. They get this energy from the food. Our body uses this energy for doing work. We eat different varieties of food like rice, bread, vegetables, eggs, butter, sweets, cheese, etc.
Posted by Ashalatha G S 6 years, 7 months ago
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Yogita Ingle 6 years, 7 months ago
We need to sort objects into group because it makes convenient study their properties and also observe any patterns in these properties. It also help us to locate any object. E.g.A grocer usually keeps all the type of biscuits at one corner of his shop, all soaps at another while grains and pulses are stored at some other place.
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Sia ? 6 years, 7 months ago
The process of making yarn from fibres is called spinning. In this process, fibres from a mass of cotton wool are drawn out and twisted. This brings the fibres together to form yarn.
A simple device used for spinning is a hand spindle also called takli.
Another hand operated device used for spinning is charkha.
Spinning of yarn on a large scale is done with the help of spinning machines.
Posted by Aman Momin 6 years, 7 months ago
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Nitin Singh 6 years, 7 months ago
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Yogita Ingle 6 years, 5 months ago
Proteins are the most important nutrient. They are called body- building food because they help in the growth and repair of our body. they are very essential for our brain to work faster and always provide us with energy. We get protein from milk, eggs, meat, etc.
Posted by Vyankat Musande 6 years, 7 months ago
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Yogita Ingle 6 years, 7 months ago
Test for Starch
There are many types of carbohydrates. The main carbohydrates found in our food are in the form of starch and sugars. We can easily test if a food item contains starch.
- Take small quantity of the food items to be tested.
- Put 2-3 drops of iodine solution on it.
- Observe the colour of the food item.
- Blue-black colour indicates the presence of starch in the tested food item.
Test for Protein
Proteins are needed for the growth and repair of our body. Foods containing proteins are often called ‘Body Building Foods’. Test if a food item contains protein.
- Take a small quantity of the food items to be tested.
- Grind/mash/paste/powder the food item.
- Put the food item into a test tube.
- Add 10 drops of water and shake the test tube.
- Using a dropper add two drops of copper sulphate solution to the test tube.
- Add 10 drops of caustic soda solution and shake the test tube.
- Observe the colour of the mixture.
- Violet colour indicates the presence of proteins in the tested food item.
Posted by Sherly Johnson 6 years, 7 months ago
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Sia ? 6 years, 7 months ago
Presence of starch in leaves can be tested by Iodine test. Iodine turns starch solution blue-black. First of all we take some green leaves in test tube, boil them in water to remove pigment. Take out the leaves and put 3-4 drops of iodine solution. The blue-black colour of leaves indicate the presence of starch in leaves.
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Sunil Waghmode 6 years, 7 months ago
Posted by Shlok Mehrotra 6 years, 7 months ago
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Yogita Ingle 6 years, 5 months ago
Magnetism was discovered about 4000 years back in ancient Greece.
Some items such as iron and nickel get attracted to magnets and are called magnetic materials.
Items that do not get attracted to magnets are called non-magnetic.
Posted by Aditi Patil 6 years, 7 months ago
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Sia ? 6 years, 7 months ago
Check NCERT Questions and Answers here : https://mycbseguide.com/ncert-solutions.html
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