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Ask QuestionPosted by Priyanshu Jha 5 years, 2 months ago
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Paru ? 5 years, 2 months ago
Posted by Krishna Gupta 5 years, 2 months ago
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Varun Kumar Barnwal 5 years, 2 months ago
Gaurav Seth 5 years, 2 months ago
The electronic configuration of carbon atom is 1s2 2s2 2px1 2py1 and has four valence electrons. In order to form ionic compound, it has to either lose four electrons or gain four electrons. Since very high energy are involved in doing so. Carbon does not form ionic compounds. It completes its octet by sharing of electrons and forms covalent compounds.
Posted by Nehuti Goel 5 years, 2 months ago
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Varun Kumar Barnwal 5 years, 2 months ago
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Yangzee Sherpa 5 years, 2 months ago
Posted by T Priya 5 years, 2 months ago
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Yogita Ingle 5 years, 2 months ago
Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.
Chemical equation:
2K(s)+2H2O(l)→2KOH(aq)+H2(g)
Posted by Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 2 months ago
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Sruthi Kambar 5 years, 2 months ago
Yogita Ingle 5 years, 2 months ago
Optical fiber is the technology associated with data transmission using light pulses travelling along with a long fiber which is usually made of plastic or glass. Metal wires are preferred for transmission in optical fiber communication as signals travel with fewer damages. Optical fibers are also unaffected by electromagnetic interference. The fiber optical cable uses the application of total internal reflection of light. The fibers are designed such that they facilitate the propagation of light along with the optical fiber depending on the requirement of power and distance of transmission. Single-mode fiber is used for long-distance transmission, while multimode fiber is used for shorter distances. The outer cladding of these fibers needs better protection than metal wires.
Paru ? 5 years, 2 months ago
Posted by Amita Singh 5 years, 2 months ago
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Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 2 months ago
Posted by Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 2 months ago
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Sruthi Kambar 5 years, 2 months ago
Yogita Ingle 5 years, 2 months ago
Ordinary light is divergent and incoherent whereas laser light is highly directional and coherent.
Ordinary light is mostly unpolarized whereas light from a laser is polarized.
Ordinary light is polychromatic ( contains all colors of light) whereas light from a laser is monochromatic.
Posted by Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 2 months ago
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R Shiva Prasad Sharma 5 years, 2 months ago
Posted by Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 2 months ago
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Yogita Ingle 5 years, 2 months ago
| Nervous control | Hormonal Control | ||
| 1 | It is consist of nerve impulses between PNS, CNS and Brain. | 1 | It consists of endocrine system which secretes hormones directly into blood. |
| 2 | Here response time is very short. | 2 | Here response time is very long. |
| 3 | Nerve impulses are not specific in their action. | 3 | Each hormone has specific actions. |
| 4 | The flow of information is rapid. | 4 | The flow of information is very slow. |
Posted by Kashish . 5 years, 2 months ago
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Sruthi Kambar 5 years, 2 months ago
Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 2 months ago
Anmol Genius 5 years, 2 months ago
Meghna Thapar 5 years, 2 months ago
Planets do not twinkle because:1. Planets are not a source of light. Instead, they reflect low intensity light reaching them. 2. They are also closer to the Earth than the distant stars. Hence, the shift due to atmospheric refraction is smaller.3. As the planets are closer, planets appear larger in comparison to the stars. Hence, the shift is not enough for the planets to twinkle. Twinkling occurs because the apparent position of a heavenly body is not fixed because the light through them is refracted through the atmosphere. Planets appear larger to human eyes as compared to stars because they are closer. As the angle subtended by the planets at the human eye is more, the shift in their position(as compared to stars) is smaller. Since, the shift is smaller, they do not twinkle.
Posted by Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 2 months ago
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Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 2 months ago
Mortal Combat 5 years, 2 months ago
Gaurav Seth 5 years, 2 months ago
Ozone layer protects us from Sun’s harmful UV radiations. It shields the surface of the earth from ultraviolet (UV) radiation from the Sun. This radiation is highly damaging to organisms, for example, it is known to cause skin cancer in human beings.
There is increased concern about the effect of ozone depletion. The depletion of ozone causes the harmful UV rays to reach the earth and this has resulted in increased incidence of skin cancers in humans. UV rays may also cause genetic mutations in living organisms.
To limit the damage to the ozone layer, the release of CFCs into the atmosphere must be reduced. CFCs used as refrigerants and in fire extinguishers should be replaced with environmentally-safe alternatives. Also, the release of CFCs through industrial activities should be controlled.
Posted by A:) 5 years, 2 months ago
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Varun Kumar Barnwal 5 years, 2 months ago
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Posted by Rakesh Kumar 5 years, 2 months ago
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Varun Kumar Barnwal 5 years, 2 months ago
Gaurav Seth 5 years, 2 months ago
Mendel selected garden pea plant for his experiments because of the following characteristics:
(i) The flowers of this plant are bisexual.
(ii) They are self-pollinating, and thus, self and cross pollination can easily be performed.
(iii) The different physical characteristics were easy to recognise and study.
(iv) They have a shorter life span and are the plants are easier to maintain.
Posted by Rohit Singh 5 years, 2 months ago
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Ranbeer Boparai 5 years, 2 months ago
Gaurav Seth 5 years, 2 months ago
The water of crystallization means having a fixed number of molecules present in one formula of a unit of salt. Crystal salts with water of crystallization are known as hydrates. The other names of water crystallization are crystallization water or water of hydration.
The water of crystallization is caused by forming purified crystals from an aqueous solution. These crystals do not include contaminants. These crystals are easily affected by the heat.
Examples of water of crystallization are proteins with more than 50% of the water of crystallization and copper sulfate pentahydrate with five molecules of water of crystallization.
Posted by Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 2 months ago
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Enola Holmes 5 years, 2 months ago
Posted by Dilraj Kâlêsh 5 years, 2 months ago
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Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 2 months ago
Posted by Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 2 months ago
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Yogita Ingle 5 years, 2 months ago
A gland is an organ in the body made of a group of secreting cells. There are several kinds of glands in a human body some of the most common glands are
- Salivary glands - secrete saliva
- Sweat glands- secrete sweat
- Mammary glands- secrete milk
- Endocrine glands - secrete hormones
Posted by Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 2 months ago
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Yogita Ingle 5 years, 2 months ago
The preserved remains of animals or plants or other organisms from the distant past are called fossils. These fossils tell us about many extinct animals and also give insights into how the evolution could have taken place.
Evolution is the successive alteration in inherited characteristics over an extensive span of time, typically over generations.
- Evolution relies on genetic variation in a population which affects the physical characteristics of an organism. Certain physical characteristics may give advantage to the individuals which can be transferred to their offspring.
- The evidence of evolution is one of the fundamental keystones of modern biological theory. It is the only way which can prove all the proposed theories of evolution.
- We have a number of evidences to prove the biological evolution namely fossils, comparative anatomy and embryo development pattern.
Posted by Dilraj Kâlêsh 5 years, 2 months ago
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Varun Kumar Barnwal 5 years, 2 months ago
Vivek Fulara 5 years, 2 months ago
Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 2 months ago
Posted by Dilraj Kâlêsh 5 years, 2 months ago
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Yogita Ingle 5 years, 2 months ago
Physical properties of metal
- Metals are solid except mercury that is found in liquid state at room temperature.
- They are hard and tough except sodium and potassium that can be cut with a knife.
- They are lustrous i.e. they shine in light because metals possess free electrons that vibrates on getting in contact with light.
- They have high melting points except caesium and gallium have very low melting point.
- They are good conductors of heat and electricity. The best conductors of electricity are silver and copper whereas lead and mercury are comparatively poor conductors.
Physical properties of non-metals
- Non-metals may be either solids, liquids or gases.
- Solid non-metals are brittle and break down into powdery mass on striking with a hammer except diamond which is the hardest non-metal.
- They have a dull luster but iodine is lustorous.
- They have low melting points except diamond that has very high melting point.
- They are poor conductors of heat and electricity except graphite.
- They are not malleable.
- They are not ductile.
- They are not sonorous.
- Examples are carbon, Sulphur, oxygen, phosphorous and many more.
Posted by Dilraj Kâlêsh 5 years, 2 months ago
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Yogita Ingle 5 years, 2 months ago
Platinum, gold and silver are used to make jewellery because these are low reactive metals so rarely corrosion occur (In silver) and hence do not lost their shine and lustre.
Posted by Dilraj Kâlêsh 5 years, 2 months ago
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Yogita Ingle 5 years, 2 months ago
- Alloy is a metal made by combining two or more metallic elements, especially to give greater strength or resistance to corrosion.
- They are homogeneous mixture of two or more substances.
- An example of an alloy is the tin in the mixture of copper and tin that makes bronze.
- Another example of an alloy is brass, which is made from copper and zinc.
Posted by Aakaankshaa Patra 5 years, 2 months ago
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Yogita Ingle 5 years, 2 months ago
Few of traditional water harvesting systems are:
Paar harvesting system: This practice is majorly implemented in desert areas in Rajasthan. In this process the water is collected from the catchment and left to percolate in soil.
Talaab: This is most ancient type of water harvesting system. These Talaabs are reservoirs that may be natural or man made. The water stored in the reservoirs are majorly used for drinking and irrigation.
Posted by Amrita Karotiya 5 years, 2 months ago
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Posted by Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 2 months ago
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Priya Yadav 5 years, 2 months ago
Posted by Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 2 months ago
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Gaurav Seth 5 years, 2 months ago
Electric short circuit occurs if the insulation of the wires used in circuit is damaged, due to which live wire and neutral wire comes in direct contact. This results in increase of current in the circuit.
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Varun Kumar Barnwal 5 years, 2 months ago
1Thank You