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Ask QuestionPosted by Raisha Prakash 6 years, 10 months ago
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Posted by Raisha Prakash 6 years, 10 months ago
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Meghna Thapar 5 years, 6 months ago
- Reaction of Metals with Water: Metals react with water to produce metal oxides with the release of hydrogen gas. But all metals do not react with water.
Metal + Water → Metal oxide + Hydrogen
Metal oxides that are soluble in water dissolve in it to further form metal hydroxide.
Metal oxide + Water → Metal hydroxide
Metals such as sodium and potassium react vigorously with cold water to lead to evolution of hydrogen, which immediately catches fire producing a large quantity of heat.
Metals such as aluminium, zinc and iron do not react with cold or hot water, but they react with steam to form metal oxides and hydrogen.
Posted by Raisha Prakash 6 years, 10 months ago
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Meghna Thapar 5 years, 6 months ago
Tactual aids are non-optical sensory aids which involve the sense of touch,e.g- Braille system for blind people. e.g. Braille system for blind people. Auditory aids are non-optical sensory aids which involve the sense of hearing, e.g. Tape recorders, cassettes for deaf.
Posted by Raisha Prakash 6 years, 10 months ago
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Meghna Thapar 5 years, 10 months ago
Our atmosphere has 78% of nitrogen but this atmospheric nitrogen cannot be utilised directly by plants or animals. It has to be first converted into nitrogen compounds. This process of converting nitrogen gas of atmosphere into compounds of nitrogen is called nitrogen fixation.
Posted by Raisha Prakash 6 years, 10 months ago
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Meghna Thapar 5 years, 10 months ago
Manure is a natural substance obtained by the decomposition of animal wastes like cow-dung, human wastes and plant residues, which supplies essential elements and humus to the soil and makes it more fertile. The decomposition is carried out by microorganisms. The decomposed animal and plant matter is used as organic manure.
Posted by Krishna Gaud 6 years, 10 months ago
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Krishna Gaud 6 years, 10 months ago
Posted by Pankaj Pawar 6 years, 10 months ago
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Meghna Thapar 5 years, 10 months ago
Structure of Human Ear:
The ears are the sense organs which help us in hearing sound. It consists of three compartments – outer ear, middle ear and inner ear.
- The outer ear consists of a broad part called pinna having a long passage called ear canal. At the end of the ear canal is a thin, elastic and a circular membrane called ear drum. It is also called tympanum. The outer ear contains air.
- The middle ear contains three small and delicate bone called hammer, anvil and stirrup. These bones are linked to one another. The middle ear transmits the amplified pressure variations received from the sound wave to the inner ear.
- In the inner ear, the pressure variations are turned into electrical signals by the cochlea. These electrical signals are sent to the brain via the auditory nerve, and the brain interprets them as sound.
Posted by Dhruv Sharma 6 years, 10 months ago
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Style Miracle 6 years, 10 months ago
Yogita Ingle 6 years, 10 months ago
Lustre is the property of surface of substance to reflect light due to which substance appears shiny. For Eg iron, copper, aluminium, gold, silver, etc metals have highly shining surface and thus possess a good metallic lustre and are used for making ornaments.
Posted by Ummer Tofeeq 6 years, 10 months ago
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Meghna Thapar 5 years, 6 months ago
When two negatively charged objects are brought near each other, a repulsive force is produced. When two positively charged objects are brought near each other, a similar repulsive force is produced. When a negatively charged object is brought near a positively charged object, an attractive force is produced.
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Posted by Krishna Rana 6 years, 10 months ago
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Posted by Tejas Patil 6 years, 10 months ago
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Yogita Ingle 6 years, 10 months ago
A kaleidoscope is an optical device which creates colourful beautiful patterns due to multiple reflections in plane mirrors. It is a cylinder which has three plane mirrors and loose, colored objects such as beads or pebbles and bits of glass. As the viewer looks into one end, light entering the other end creates a colorful pattern, due to multiple reflection of these objects in the mirrors.
Posted by Ranjan Kumar 6 years, 10 months ago
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Jasmitha Do Your Best 6 years, 10 months ago
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Yogita Ingle 6 years, 10 months ago
The tail of a comet is mainly water vapour and other gases. The second tail is is usually dust particles. They point away from the sun because they have virtually no mass and so they stream out away from the sun because of the solar wind (charged particles blasted out in to space by the sun) and the tail always points away from the sun even when the comet is moving away from the sun
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Posted by Technical Gamer 6 years, 10 months ago
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Yogita Ingle 6 years, 10 months ago
The SI unit also elaborately known as International System of Units has been mainly adopted from French Système international (d’unités). This is a modern version of the metric system and is a popularly used when measuring physical quantities. This system is basically built upon seven base units which are, Metre, Kilogram, Ampere, Kelvin, Second, Candela and Mole.
Posted by Neema Devi 6 years, 10 months ago
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Yogita Ingle 6 years, 10 months ago
Pressure is usually defined as the amount of force that is applied to a certain area.
The SI unit of pressure is Pascal (represented as Pa) which is equal to one newton per square metre (N/m-2 or kg m-1s-2).
Posted by Naman Narwani 6 years, 10 months ago
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Yogita Ingle 6 years, 10 months ago
Germanium, arsenic and antimony all are metalloid. A metalloid is a type of chemical element which has properties in between, or that are a mixture of, those of metals and nonmetals.
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Meghna Thapar 5 years, 6 months ago
The aqueous humour plays an essential role in the health of your eye. As well as nourishing the cornea and the lens by supplying nutrition such as amino acids and glucose, the aqueous humour will: Maintain intraocular pressure. Transport vitamin C in the front segment to act as an antioxidant agent. The sclera is the opaque, fibrous, tough, protective outer layer of the eye (“white of the eye”) that is directly continuous with the cornea in front and with the sheath covering the optic nerve behind. The sclera provides protection and form.
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