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Ask QuestionPosted by Rishav Kumar 7 years, 5 months ago
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Neha Choudhary 7 years, 5 months ago
Posted by Chirayu Suranse 7 years, 5 months ago
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Yogita Ingle 7 years, 5 months ago
A chemical reaction that emits heat energy is known as an exothermic reaction. In an exothermic reaction, the reactants release heat energy while they undergo the reaction to become products.
Reactants → Products + Heat
Exothermic reactions are everywhere, from the burning of a candle to our burning sun.
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Meghna Thapar 6 years ago
An object forms shadow on the opposite side to the source of light. The sunlight also forms shadows of the objects which are on the ground or near the ground. For example – if we stand in the sun, our body casts a shadow on the ground.
Posted by Swayam Sahoo 7 years, 5 months ago
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Meghna Thapar 5 years, 11 months ago
Herb - Paddy, carrot and cabbage
Tree - Coconut, Eucalyptus
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Monik Grover 7 years, 5 months ago
Posted by Samyak Creation 7 years, 5 months ago
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Meghna Thapar 6 years ago
The backbone forms the main supporting structure of the body and is made up of 33 small bones placed one over the other. It is also called vertebral column. Between the various vertebrae of backbone are the discs of cartilage which allow the vertebrae to move slightly and enable the backbone to bend forwards and backwards.
Posted by Shivani Makkar 7 years, 5 months ago
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Meghna Thapar 6 years ago
Niels Bohr, revised Rutherford’s atomic model and put forth the following suggestions:
Neils Bohr proposed that the electrons possess a specific amount of energy which allows them to revolve around the nucleus. The electrons are confined to these energy levels. While revolving in these discrete orbits, the electrons do not radiate energy. Hence, these orbits are also known as stationary orbits or stationary shells. Smaller the size of the orbit, smaller is its energy.
As we move away from nucleus, the energy of the orbit increases progressively. The transfer of an electron from one orbit to another is always accompanied with absorption or emission of energy. When an electron jumps from a lower energy level to a higher energy level, it absorbs energy. When an electron returns from a higher energy level to a lower energy level, it emits energy.
Posted by Samyak Creation 7 years, 5 months ago
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Meghna Thapar 5 years, 11 months ago
The presence of starch in leaves can be tested by the Iodine test. When we remove chlorophyll from the leaf by boiling it in alcohol and then put two drops of iodine solution, it is colour change to blue indicates the presence of starch.
Posted by Samyak Creation 7 years, 5 months ago
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Meghna Thapar 6 years ago
Fabrics are made from yarn by weaving and knitting.
Weaving is a process of making a fabric by arranging yarns passing in one direction with other yarns at right angles to them. Two sets of yarn are woven to make a fabric. The weaving of yarn to make fabrics is done by using ‘looms'.Knitting is the process of making a fabric by interlocking loops of single yarn with knitting needles or machines. It can be done by hand or on machines. A sweater is made by the process of knitting by using a single ‘woollen yarn’ with the help of knitting needles.
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Meghna Thapar 6 years ago
Hand picking:
This method is usually used to separate undesirable substances such as small pieces of stones from wheat, rice and pulses. The pieces of stone are picked up from the grains by hand, one by one, and thrown away. In this way, all the stone pieces are removed and only foodgrains are left behind.
Posted by Dhruv Nautiyal 7 years, 5 months ago
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Kumar Vishwash 7 years, 5 months ago
Posted by Dhruv Nautiyal 7 years, 5 months ago
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Meghna Thapar 6 years ago
Sieving is used to separate those mixtures which have components of different sizes. In this process, the mixture having components of different sizes are put in a sieve and the sieve is moved back and forth continuously.
Examples of sieving:
- The sieving of flour is done to remove the coarse particles of flour (wheat bran) from it so as to obtain fine flour to make chapattis.
- In a flour mill, the impurities from the wheat are removed by the process of sieving before grinding it.
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Dhruv Nautiyal 7 years, 5 months ago
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Harmanjit Singh 7 years, 5 months ago
1Thank You