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Ask QuestionPosted by Vedant Panwar 5 years, 2 months ago
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Durva Kaurav 5 years, 2 months ago
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Posted by Bhawesh Naik 5 years, 2 months ago
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Meghna Thapar 5 years, 2 months ago
In the refining of silver the following chemical reaction is involved. The silver nitrate is in solution and the metallic copper will dissolve to form copper nitrate; as it does, it will precipitate the silver in solution as metallic silver.
The silver nitrate is in solution and the metallic copper will dissolve to form copper nitrate; as it does, it will precipitate the silver in solution as metallic silver. That is, copper is exchanged for the silver in solution and silver is replaced by the copper that is not in solution.
The following chemical reaction is involved:
2AgNO3(aq)+Cu(s)→2Ag(s)+Cu(NO3)2(aq)
Posted by Bhawesh Naik 5 years, 2 months ago
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Posted by Sharwin Brijesh 5 years, 2 months ago
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Sakshi Jagtap 5 years, 2 months ago
Posted by Vivek Rajput 5 years, 2 months ago
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Meghna Thapar 5 years, 2 months ago
When a girl is born, the ovaries already contain thousands of immature eggs. On reaching puberty, some of these start maturing. One egg is produced every month by one of the ovaries. The egg is carried from the ovary to the womb through a thin oviduct or fallopian tube. The two oviducts unite into an elastic bag-like structure known as the uterus. The uterus opens into the ****** through the cervix. The sperms enter through the vaginal passage during sexual intercourse. They travel upwards and reach the oviduct where they may encounter the egg. The fertilised egg, the zygote, gets implanted in the lining of the uterus, and starts dividing.
The release of an ovum from an ovary is called ovulation. In human females, the ovaries start releasing ovum once every 28 days from the age of puberty. Fertilisation is possible if mating takes place during the middle of menstrual cycle because in a normal healthy girl the ovulation takes place on the 14th day of the beginning of menstrual cycle of 28 days. The embedding of embryo in the thick lining of the uterus is called implantation.
Posted by Devashish Biswas 5 years, 2 months ago
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Muskan Sharma 5 years, 2 months ago
Narendra Kushwah 5 years, 2 months ago
💪💪Divy Thakur💪💪 5 years, 2 months ago
Yogita Ingle 5 years, 2 months ago
Concave Mirror
We know that a cut out of a reflective sphere is a spherical mirror. If the reflective surface is on the side curved inwards, it is a concave mirror. Concave mirrors are commonly used as shaving mirrors or by dentists and even in telescopes. The reflected image is magnified but the field of view is limited. Concave mirrors are also called converging mirrors.
Convex Mirror
Similarly, if the reflective surface is curved outwards, it is a convex mirror. Convex mirrors are used extensively as part of car mirrors. Depending on the focal length, the reflected image is reduced in size but the field of view is more. This is very useful for drivers as the blind spots are drastically reduced. Convex mirrors are also called fish eye or diverging mirrors. You can recognize these mirrors easily as the outward bulge is quite evident most of the time.
Posted by Lucifer?? Morningstar?? 5 years, 2 months ago
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B.Aishwarya 203 Kalyannagar 5 years, 2 months ago
Sakshi Jagtap 5 years, 2 months ago
Ayush Kashyap 5 years, 2 months ago
Posted by Akanksha Chauhan 5 years, 2 months ago
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Itachi Uchiha ? 5 years, 2 months ago
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Posted by Rani Kumari 5 years, 2 months ago
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Shobha Kumari 5 years, 2 months ago
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Posted by Anju Sharma 5 years, 2 months ago
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Meghna Thapar 5 years, 2 months ago
There are no batteries that actually store electrical energy; all batteries store energy in some other form. ... The space between the electrodes is filled with an electrolyte--an ionic liquid that conducts electricity. One electrode--the anode--permits electrons to flow out of it. The other--the cathode--receives them. A battery is a device that stores chemical energy and converts it to electrical energy. The chemical reactions in a battery involve the flow of electrons from one material (electrode) to another, through an external circuit. The flow of electrons provides an electric current that can be used to do work.
Posted by Theerthank Ramakrishna .V.K 5 years, 2 months ago
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Theerthank Ramakrishna .V.K 5 years, 2 months ago
Gaurav Seth 5 years, 2 months ago
Mendel selected seven pairs of contrasting characters of pea plants for his experiments which are as follows:
- Pea shape: Round or Wrinkled.
- Pea color: Green or Yellow.
- Pod shape: Constricted or Inflated.
- Pod color: Green or Yellow.
- Flower color: Purple or White.
- Plant size: Tall or Dwarf.
- Position of flowers: Axial or Terminal.
Posted by Khushdeep Kaur 5 years, 2 months ago
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Ragini Tomar 5 years, 2 months ago
Mukul Kumar 5 years, 2 months ago
Gaurav Seth 5 years, 2 months ago
A galvanometer is an electromechanical instrument used for detecting and indicating an electric current. A galvanometer works as an actuator, by producing a rotary deflection of a pointer, in response to electric current flowing through a coil in a constant magnetic field.
Posted by Ramandeep Kaur 5 years, 2 months ago
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Gaurav Seth 5 years, 2 months ago
Balanced equation for dehydration of ethanol by hot concentrated sulfuric acid
- The reactants involved in the given reaction is ethanol with the chemical formula
.
- When it is treated with hot concentrated sulfuric acid at 443K, it leads to the formation of ethene and water.
- As the water molecule present in the ethanol is removed, this process is called dehydration.
- As hot concentrated sulfuric acid is used as a catalyst, it is not added in the reactant side.
- The balanced chemical equation involved in the process is as follows:
Yogita Ingle 5 years, 2 months ago
- The reactants involved in the given reaction is ethanol with the chemical formula
- When it is treated with hot concentrated sulfuric acid at 443K, it leads to the formation of ethene and water.
- As the water molecule present in the ethanol is removed, this process is called dehydration.
- As hot concentrated sulfuric acid is used as a catalyst, it is not added in the reactant side.
- The balanced chemical equation involved in the process is as follows:
Posted by Gopal Roy 5 years, 2 months ago
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Yogita Ingle 5 years, 2 months ago
Abnormally high blood pressure and a combination of high psychological stress are known as Hypertension. These patients suffering from this disorder will have their blood pressure reading greater than 140 over 90 mm.
Hypertension is diagnosed by measuring blood pressure. The Systolic pressure would be the first readings viz. a pressure by which the heart pumps blood through the body, and second readings would be the Diastolic pressure, meaning a pressure at which the heart relaxes and refills the blood.
Posted by Shashi Verma 5 years, 2 months ago
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Posted by Kanak Kumari 5 years, 2 months ago
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Anju Sharma 5 years, 2 months ago
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T Prem 5 years, 2 months ago
Palak Jain 5 years, 2 months ago
Yogita Ingle 5 years, 2 months ago
Reproduction means to reproduce. It is a biological process by which an organism reproduces an offspring who is biologically similar to the organism. Reproduction enables and ensures the continuity of species, generation after generation. It is the main feature of life on earth.
Posted by Meenal Dayal 5 years, 2 months ago
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Yogita Ingle 5 years, 2 months ago
pH Value and Nature of a Solution
- If [H+] > 10-7, pH is less than 7 and the solution is acidic.
- If [H+] = 10-7, pH is 7 and the solution is neutral.
- If [H+] < 10-7, pH is more than 7 and the solution is basic.
Posted by Itachi Uchiha ? 5 years, 2 months ago
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Posted by Khushi ?✨ 5 years, 2 months ago
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Palak Jain 5 years, 2 months ago
Yogita Ingle 5 years, 2 months ago
Changes developed in Boys
- Boys develop the heavier muscular body, wide shoulders, and narrow hips.
- Enlargement of the voice box leads to a much deeper voice.
- Maturation of testis and starts to produce sperms.
- The growth of hairs on the chest.
- Enlargement of Adam’s apple.
Changes developed in girls
- Rounded hips and breast development.
- Matured ovaries start to release a mature ovum.
- Ovulation and menstruation initiate.
- Mammary gland enlargement.
Posted by Akash K 5 years, 2 months ago
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Yogita Ingle 5 years, 2 months ago
A rainbow is regarded as one of the most spectacular light shows observed on the earth. Rainbow is a multicoloured arc made due to the striking of light on water droplets. Rainbow is produced after the rain, by reflection, refraction and light dispersion process in droplets of water. All such events develop a light spectrum in the sky are called rainbow.
The necessary conditions for the formation of the rainbow
- Presence of raindrops.
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Sun should be at your back to observe the rainbow.
Formation of the rainbow:
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Light rays, reach the drop near its top level. At first, there is refraction, then the dispersion of white light into colours of a different wavelength.
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The violet is the most deviated and red is the least deviated colour.
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Reaching the opposite side of the drop, each colour is refracted back into the drop due to the complete internal reflection that hits the drop surface.
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Every colour is refracted to the air again.
- We experience the rainbow when we observe in between 42-20 degrees.
Posted by Akash K 5 years, 2 months ago
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Yogita Ingle 5 years, 2 months ago
- A rainbow is a natural spectrum of sunlight in the form of bows appearing in the sky when the sun shines on rain drops.
- It is combined result of reflection, refraction and dispersion of sunlight from water droplets, in atmosphere.
- Always it formed in the direction opposite to the sun.
- To see a rainbow, the sun must behind us and the water droplets falls infront of us.
- When a sunlight enters into a spherical rain¬drop, it is refracted and dispersed. The different colours of light bent in different angles.
- When different colours of light fall on the back inner surface of drop, it (water drop) reflects (different colours of light) internally (total internal reflection).
- The water drops again refracts the different colours, when it comes out from the raindrop.
- After leaving this different colours from the raindrop as rainbow, reach our eye. Thus, we see a rainbow.
Posted by Anika Khatun 5 years, 2 months ago
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Anju Sharma 5 years, 2 months ago
Yogita Ingle 5 years, 2 months ago
The copying of DNA during reproduction is important because:
- The replication of DNA ensures that each daughter cell formed at the end of cell division, receives equal amount of DNA.
- If DNA won't be copied then the daughter cells won't receive all necessary genes.
- There may be absence of important proteins which are encoded by DNA, if DNA won't be replicated.
- Copying of DNA may result in recombination which will lead to evolution.
- Transfer of genetic material from one generation to other makes the organisms to have similar functions.
- Stability of population is maintained.
Akash K 5 years, 2 months ago
Posted by Sai Charan 5 years, 2 months ago
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Gaurav Seth 5 years, 2 months ago
Resistance is directly proportional to area and inversely proportional to length.
Hence if we increase resistance we get increased area and decreased length and vice - versa.
Also Resistivity wont change if the length and area is changed. It remains constant for all values for a given material.
So,
Let the original length be = x
Let the original area be = y
Resistivity = k ( Constant )
So Resistance = ky / x -----( Equation 1 )
Now given that length is halved and area is doubled. Then we get,
Length = x / 2
Area = 2y
Resistivity = k ( Constant )
Now Resistance = k * 2y / x / 2
= 2 ky * 2 / x
= 4 ky / x -----( Equation 2 )
Now comparing Equation 1 and 2 we get that,
Resistance has become 4 times after modifications.
Hence Resistance will become 4 times in the new condition, if the area is doubled and length is halved.
Posted by Rita Jani 5 years, 2 months ago
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Sofia Sharma 5 years, 2 months ago
Yug Borana 5 years, 2 months ago
Sakshi Jagtap 5 years, 2 months ago
Posted by Khushdeep Kaur 5 years, 2 months ago
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Akash K 5 years, 2 months ago
Gaurav Seth 5 years, 2 months ago
Normal range of breathing rate per minute in an average adult person at rest is 15–18
This means on an average, an adult human being breathes in and out 15–18 times in a minute.
Posted by Ashwitha Reddy 5 years, 2 months ago
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Gaurav Seth 5 years, 2 months ago
Pure acids in the liquid state are exceedingly poor conductors of electricity. The fact that aqueous solutions of acids conduct electricity is definite evidence of the existence of ions in these solutions. Acids undergo dissociation in aqueous solution to form H+ ions.
When electricity is passed through an aqueous solution of an acid, the H+ ions reach the cathode and each H+ ion picks up one electron from the cathode to form H2 gas. Because of this reaction, an aqueous solution of acid conducts electricity.
HCl(aq) → H+(aq) + Cl–(aq)
Posted by Rani Kumari 5 years, 2 months ago
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Gaurav Seth 5 years, 2 months ago
HRD Minister Ramesh Nishank announced a major CBSE syllabus reduction for the new academic year 2020-21 on July 7 which was soon followed by an official notification by CBSE on the same.
Considering the loss of classroom teaching time due to the Covid-19 pandemic and lockdown, CBSE reduced the syllabus of classes 9 to 12 with the help of suggestions from NCERT.
The CBSE syllabus has been rationalized keeping intact the learning outcomes so that the core concepts of students can be retained.
Deleted syllabus of CBSE Class 10 Science
Mahakdeep Kaur Aulakh 5 years, 2 months ago
Posted by Dhrangi Prakash 12 5 years, 2 months ago
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Yogita Ingle 5 years, 2 months ago
Leeuwenhoek discovered the free living cells in pond water for the first time. In the year 1674, with the help of improved microscope.
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Harsh Kumar 5 years, 2 months ago
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