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Meghna Thapar 5 years, 6 months ago
Glycerine acts as anti-dehydrating solution so it is used in the staining process of onion peel
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Meghna Thapar 5 years, 6 months ago
The Postulates of Dalton's Atomic Theory:
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- All matter is made up of very tiny particles called atoms.
- Atoms are indivisible particles, which can neither be created nor destroyed in a chemical reaction.
- The atoms of a given element are identical in mass and chemical properties.
- Atoms of different elements have different masses and chemical properties.
- Atoms combine in the ratio of small whole numbers to form compounds.
- The relative number and types of atoms are constant in a given compound.
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Meghna Thapar 5 years, 6 months ago
Loud sounds are sounds that are high in volume and soft sounds are those that are low in volume. Some examples of loud sounds include lawn mowers, clapping hands and yelling. These sounds are produced by a large amount of energy being converted to sound, which increases the amplification of the waves. Soft sounds, contrarily, are produced by a small amount of energy being converted to sound, which decreases their volume. Whispering and a cat's purr are soft sounds.
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Gayathri Ramesh 5 years, 7 months ago
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Meghna Thapar 5 years, 6 months ago
Loud sounds are sounds that are high in volume and soft sounds are those that are low in volume. Some examples of loud sounds include lawn mowers, clapping hands and yelling. These sounds are produced by a large amount of energy being converted to sound, which increases the amplification of the waves. Soft sounds, contrarily, are produced by a small amount of energy being converted to sound, which decreases their volume. Whispering and a cat's purr are soft sounds.
Posted by Himanshu Chaturvedi 5 years, 7 months ago
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Meghna Thapar 5 years, 6 months ago
- One coulomb of charge can be defined as that quantity of charge which extracts a force of 9X109 Newton on an equal charge is placed at 1m distance.
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Yogita Ingle 5 years, 7 months ago
Diseases are caused as result of following reasons:
- Lack of nutritious and sufficient food.
- &Unhealthy and dirty surroundings.
- Contact with an infected person.
- Using the personal belongings of an infected person.
- Eating untreated water and food from an unclean and unhygienic place.
- Lack of hygienic practices
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Stomata are the minute openings, generally found in the epidermis of leaves. They are typically found in plant leaves and can also be found in stems and other parts of plants. Stomata play an important role by permitting the movement of gases such as oxygen, carbon dioxide, and water vapour to diffuse between the interior and outer surface of the plant tissues.
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Meghna Thapar 5 years, 7 months ago
Few diseases caused by bacteria are:
(i) Tuberculosis (T.B.) – T.B. is an infectious disease which is communicated from one person to another directly or indirectly. It is caused by bacterium called Mycobacterium tuberculosis. T.B. can affect all parts of the body such as lungs, lymph glands, bones, intestine etc.
(ii) Cholera – Cholera is an acutely infectious, fatal disease and is more common during overcrowded fairs, festivals and after floods. Cholera is caused by the bacterium Vibrio Cholerae. It is transmitted by flies, contaminated water and food.
(iii) Typhoid – Typhoid is most common communicable disease in India. Typhoid fever is common in humans of the age 1to 15 years age group. Typhoid is caused by a rod-shaped and motile bacterium, called Salmonella typhi which is commonly found in the intestine of human beings. Human infection is direct.
(iv) Diarrhoea – Diarrhoea is an abnormally frequent discharge of semisolid or fluid faeces. The diarrhoea spreads through infection by contaminated food, water, drinks, hands, clothes, etc. The causative agents of diarrhoea are mainly bacteria such as Escherichia coli, Clostridium botulinum, Shigella dysentiriae, Campylobacter jejuri and Salmonella.
Posted by Rajat Soni 5 years, 7 months ago
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Meghna Thapar 5 years, 7 months ago
- Tyndall effect can be defined as the scattering of a beam of light by colloidal particles present in a colloidal solution. Tyndall effect can also be observed when a fine beam of light enters a room through a small hole.
- Crystallisation: The process of formation of crystals from a hot saturated solution by cooling. This method involves dissolving the mixture completely in water and heating this mixture. Further, cooling of this mixture results in the formation of crystals of a less soluble solid on the surface of the solution.
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An element can be defined as a basic form of matter which cannot be broken down into simpler substances by any physical or chemical means. A compound is a pure substance composed of two or more elements combined chemically in a fixed proportion by mass.
Posted by Ashutosh Ranjan 5 years, 7 months ago
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Meghna Thapar 5 years, 6 months ago
- The property by which the same element may exhibit one valency in one compound and another valency in some other compound is called variable valency.
Posted by Vaishnav Aggarwal 5 years, 7 months ago
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Priyanshu Khatri 5 years, 7 months ago
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